fast-copy - npm Package Compare versions

Comparing version 3.0.0-beta.7 to 3.0.0-beta.8

CHANGELOG.md

@@ -16,2 +16,3 @@ # fast-copy CHANGELOG
 - Can now create a custom copier, allowing maximum performance for specific use-cases
+- Correctly handle primitive wrappers, e.g. `new String('foo')`
 
@@ -18,0 +19,0 @@ ## 2.1.7

dist/cjs/index.cjs

@@ -8,2 +8,5 @@ 'use strict';
 var toStringObject = Object.prototype.toString;
+/**
+ * @classdesc Fallback cache for when WeakMap is not natively supported
+ */
 var LegacyCache = /** @class */ (function () {
@@ -99,8 +102,13 @@ function LegacyCache() {
 }
+/**
+ * Get the properites used when copying objects strictly. This includes both keys and symbols.
+ */
 var getStrictProperties = SUPPORTS_SYMBOL
     ? getStrictPropertiesModern
     : getOwnPropertyNames;
+/**
+ * Striclty copy all properties contained on the object.
+ */
 function copyOwnPropertiesStrict(value, clone, state) {
     var properties = getStrictProperties(value);
-    var copier = state.copier;
     for (var index = 0, length_1 = properties.length, property = void 0, descriptor = void 0; index < length_1; ++index) {
@@ -115,3 +123,3 @@ property = properties[index];
             // the loose assignment.
-            clone[property] = copier(value[property], state);
+            clone[property] = state.copier(value[property], state);
             continue;
@@ -121,3 +129,3 @@ }
         if (!descriptor.get && !descriptor.set) {
-            descriptor.value = copier(descriptor.value, state);
+            descriptor.value = state.copier(descriptor.value, state);
         }
@@ -134,37 +142,62 @@ try {
 }
+/**
+ * Deeply copy the indexed values in the array.
+ */
 function copyArrayLoose(array, state) {
     var clone = new state.Constructor();
-    var cache = state.cache, copier = state.copier;
-    cache.set(array, clone);
+    // set in the cache immediately to be able to reuse the object recursively
+    state.cache.set(array, clone);
     for (var index = 0, length_2 = array.length; index < length_2; ++index) {
-        clone[index] = copier(array[index], state);
+        clone[index] = state.copier(array[index], state);
     }
     return clone;
 }
+/**
+ * Deeply copy the indexed values in the array, as well as any custom properties.
+ */
 function copyArrayStrict(array, state) {
     var clone = new state.Constructor();
+    // set in the cache immediately to be able to reuse the object recursively
     state.cache.set(array, clone);
     return copyOwnPropertiesStrict(array, clone, state);
 }
+/**
+ * Copy the contents of the ArrayBuffer.
+ */
 function copyArrayBuffer(arrayBuffer, _state) {
     return arrayBuffer.slice(0);
 }
+/**
+ * Create a new Blob with the contents of the original.
+ */
 function copyBlob(blob, _state) {
     return blob.slice(0, blob.size, blob.type);
 }
+/**
+ * Create a new DataView with the contents of the original.
+ */
 function copyDataView(dataView, state) {
     return new state.Constructor(copyArrayBuffer(dataView.buffer));
 }
+/**
+ * Create a new Date based on the time of the original.
+ */
 function copyDate(date, state) {
     return new state.Constructor(date.getTime());
 }
+/**
+ * Deeply copy the keys and values of the original.
+ */
 function copyMapLoose(map, state) {
     var clone = new state.Constructor();
-    var cache = state.cache, copier = state.copier;
-    cache.set(map, clone);
+    // set in the cache immediately to be able to reuse the object recursively
+    state.cache.set(map, clone);
     map.forEach(function (value, key) {
-        clone.set(key, copier(value, state));
+        clone.set(key, state.copier(value, state));
     });
     return clone;
 }
+/**
+ * Deeply copy the keys and values of the original, as well as any custom properties.
+ */
 function copyMapStrict(map, state) {
@@ -175,8 +208,7 @@ return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);
     var clone = getCleanClone(state.prototype);
-    var cache = state.cache, copier = state.copier;
     // set in the cache immediately to be able to reuse the object recursively
-    cache.set(object, clone);
+    state.cache.set(object, clone);
     for (var key in object) {
         if (hasOwnProperty.call(object, key)) {
-            clone[key] = copier(object[key], state);
+            clone[key] = state.copier(object[key], state);
         }
@@ -188,8 +220,7 @@ }
     var clone = getCleanClone(state.prototype);
-    var cache = state.cache, copier = state.copier;
     // set in the cache immediately to be able to reuse the object recursively
-    cache.set(object, clone);
+    state.cache.set(object, clone);
     for (var key in object) {
         if (hasOwnProperty.call(object, key)) {
-            clone[key] = copier(object[key], state);
+            clone[key] = state.copier(object[key], state);
         }
@@ -201,3 +232,3 @@ }
         if (propertyIsEnumerable.call(object, symbol)) {
-            clone[symbol] = copier(object[symbol], state);
+            clone[symbol] = state.copier(object[symbol], state);
         }
@@ -208,4 +239,3 @@ }
 /**
- * Get a copy of the object based on loose rules, meaning all enumerable keys
- * and symbols are copied, but property descriptors are not considered.
+ * Deeply copy the properties (keys and symbols) and values of the original.
  */
@@ -216,4 +246,4 @@ var copyObjectLoose = SUPPORTS_SYMBOL
 /**
- * Get a copy of the object based on strict rules, meaning all keys and symbols
- * are copied based on the original property descriptors.
+ * Deeply copy the properties (keys and symbols) and values of the original, as well
+ * as any hidden or non-enumerable properties.
  */
@@ -226,2 +256,11 @@ function copyObjectStrict(object, state) {
 }
+/**
+ * Create a new primitive wrapper from the value of the original.
+ */
+function copyPrimitiveWrapper(primitiveObject, state) {
+    return new state.Constructor(primitiveObject.valueOf());
+}
+/**
+ * Create a new RegExp based on the value and flags of the original.
+ */
 function copyRegExp(regExp, state) {
@@ -232,14 +271,26 @@ var clone = new state.Constructor(regExp.source, getRegExpFlags(regExp));
 }
+/**
+ * Return the original value (an identity function).
+ *
+ * @note
+ * THis is used for objects that cannot be copied, such as WeakMap.
+ */
 function copySelf(value, _state) {
     return value;
 }
+/**
+ * Deeply copy the values of the original.
+ */
 function copySetLoose(set, state) {
     var clone = new state.Constructor();
-    var cache = state.cache, copier = state.copier;
-    cache.set(set, clone);
+    // set in the cache immediately to be able to reuse the object recursively
+    state.cache.set(set, clone);
     set.forEach(function (value) {
-        clone.add(copier(value, state));
+        clone.add(state.copier(value, state));
     });
     return clone;
 }
+/**
+ * Deeply copy the values of the original, as well as any custom properties.
+ */
 function copySetStrict(set, state) {
@@ -250,33 +301,62 @@ return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);
 var isArray = Array.isArray;
-var getPrototypeOf = Object.getPrototypeOf;
+var assign = Object.assign, getPrototypeOf = Object.getPrototypeOf;
+var DEFAULT_LOOSE_OPTIONS = {
+    array: copyArrayLoose,
+    arrayBuffer: copyArrayBuffer,
+    blob: copyBlob,
+    dataView: copyDataView,
+    date: copyDate,
+    error: copySelf,
+    map: copyMapLoose,
+    object: copyObjectLoose,
+    regExp: copyRegExp,
+    set: copySetLoose,
+};
+var DEFAULT_STRICT_OPTIONS = assign({}, DEFAULT_LOOSE_OPTIONS, {
+    array: copyArrayStrict,
+    map: copyMapStrict,
+    object: copyObjectStrict,
+    set: copySetStrict,
+});
 /**
- * Create a custom copier based on the object-specific copy methods passed.
+ * Get the copiers used for each specific object tag.
  */
-function createCopier(options) {
-    var _a = options.array, array = _a === void 0 ? copyArrayLoose : _a, _b = options.arrayBuffer, arrayBuffer = _b === void 0 ? copyArrayBuffer : _b, _c = options.blob, blob = _c === void 0 ? copyBlob : _c, _d = options.dataView, dataView = _d === void 0 ? copyDataView : _d, _e = options.date, date = _e === void 0 ? copyDate : _e, _f = options.error, error = _f === void 0 ? copySelf : _f, _g = options.map, map = _g === void 0 ? copyMapLoose : _g, _h = options.object, object = _h === void 0 ? copyObjectLoose : _h, _j = options.regExp, regExp = _j === void 0 ? copyRegExp : _j, _k = options.set, set = _k === void 0 ? copySetLoose : _k;
-    var tagSpecificCopiers = {
-        Array: array,
-        ArrayBuffer: arrayBuffer,
-        Blob: blob,
-        DataView: dataView,
-        Date: date,
-        Error: error,
-        Float32Array: arrayBuffer,
-        Float64Array: arrayBuffer,
-        Int8Array: arrayBuffer,
-        Int16Array: arrayBuffer,
-        Int32Array: arrayBuffer,
-        Map: map,
-        Object: object,
+function getTagSpecificCopiers(options) {
+    return {
+        Arguments: options.object,
+        Array: options.array,
+        ArrayBuffer: options.arrayBuffer,
+        Blob: options.blob,
+        Boolean: copyPrimitiveWrapper,
+        DataView: options.dataView,
+        Date: options.date,
+        Error: options.error,
+        Float32Array: options.arrayBuffer,
+        Float64Array: options.arrayBuffer,
+        Int8Array: options.arrayBuffer,
+        Int16Array: options.arrayBuffer,
+        Int32Array: options.arrayBuffer,
+        Map: options.map,
+        Number: copyPrimitiveWrapper,
+        Object: options.object,
         Promise: copySelf,
-        RegExp: regExp,
-        Set: set,
+        RegExp: options.regExp,
+        Set: options.set,
+        String: copyPrimitiveWrapper,
         WeakMap: copySelf,
         WeakSet: copySelf,
-        Uint8Array: arrayBuffer,
-        Uint8ClampedArray: arrayBuffer,
-        Uint16Array: arrayBuffer,
-        Uint32Array: arrayBuffer,
-        Uint64Array: arrayBuffer,
+        Uint8Array: options.arrayBuffer,
+        Uint8ClampedArray: options.arrayBuffer,
+        Uint16Array: options.arrayBuffer,
+        Uint32Array: options.arrayBuffer,
+        Uint64Array: options.arrayBuffer,
     };
+}
+/**
+ * Create a custom copier based on the object-specific copy methods passed.
+ */
+function createCopier(options) {
+    var normalizedOptions = assign({}, DEFAULT_LOOSE_OPTIONS, options);
+    var tagSpecificCopiers = getTagSpecificCopiers(normalizedOptions);
+    var array = tagSpecificCopiers.Array, object = tagSpecificCopiers.Object;
     function copier(value, state) {
@@ -320,8 +400,3 @@ state.prototype = state.Constructor = undefined;
 function createStrictCopier(options) {
-    return createCopier(Object.assign({
-        array: copyArrayStrict,
-        map: copyMapStrict,
-        object: copyObjectStrict,
-        set: copySetStrict,
-    }, options));
+    return createCopier(assign({}, DEFAULT_STRICT_OPTIONS, options));
 }
@@ -328,0 +403,0 @@ /**

dist/cjs/index.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"index.cjs","sources":["../../../../src/utils.ts","../../../../src/copier.ts","../../../../src/index.ts"],"sourcesContent":["import type { CreateCopierOptions } from './index';\n\nexport interface Cache {\n  _keys?: any[];\n  _values?: any[];\n  has: (value: any) => boolean;\n  set: (key: any, value: any) => void;\n  get: (key: any) => any;\n}\n\nconst { toString: toStringFunction } = Function.prototype;\nconst { create } = Object;\nconst { toString: toStringObject } = Object.prototype;\n\nclass LegacyCache {\n  _keys: any[] = [];\n  _values: any[] = [];\n\n  has(key: any) {\n    return !!~this._keys.indexOf(key);\n  }\n\n  get(key: any) {\n    return this._values[this._keys.indexOf(key)];\n  }\n\n  set(key: any, value: any) {\n    this._keys.push(key);\n    this._values.push(value);\n  }\n}\n\nfunction createCacheLegacy(): Cache {\n  return new LegacyCache();\n}\n\nfunction createCacheModern(): Cache {\n  return new WeakMap();\n}\n\n/**\n * Get a new cache object to prevent circular references.\n */\nexport const createCache =\n  typeof WeakMap !== 'undefined' ? createCacheModern : createCacheLegacy;\n\n/**\n * Get an empty version of the object with the same prototype it has.\n */\nexport function getCleanClone(prototype: any): any {\n  if (!prototype) {\n    return create(null);\n  }\n\n  const Constructor = prototype.constructor;\n\n  if (Constructor === Object) {\n    return prototype === Object.prototype ? {} : create(prototype);\n  }\n\n  if (~toStringFunction.call(Constructor).indexOf('[native code]')) {\n    try {\n      return new Constructor();\n    } catch {}\n  }\n\n  return create(prototype);\n}\n\nfunction getRegExpFlagsLegacy(regExp: RegExp): string {\n  let flags = '';\n\n  if (regExp.global) {\n    flags += 'g';\n  }\n\n  if (regExp.ignoreCase) {\n    flags += 'i';\n  }\n\n  if (regExp.multiline) {\n    flags += 'm';\n  }\n\n  if (regExp.unicode) {\n    flags += 'u';\n  }\n\n  if (regExp.sticky) {\n    flags += 'y';\n  }\n\n  return flags;\n}\n\nfunction getRegExpFlagsModern(regExp: RegExp): string {\n  return regExp.flags;\n}\n\n/**\n * Get the flags to apply to the copied regexp.\n */\nexport const getRegExpFlags =\n  /test/g.flags === 'g' ? getRegExpFlagsModern : getRegExpFlagsLegacy;\n\nfunction getTagLegacy(value: any): string {\n  const type = toStringObject.call(value);\n\n  return type.substring(8, type.length - 1);\n}\n\nfunction getTagModern(value: any): string {\n  return value[Symbol.toStringTag] || getTagLegacy(value);\n}\n\n/**\n * Get the tag of the value passed, so that the correct copier can be used.\n */\nexport const getTag =\n  typeof Symbol !== 'undefined' ? getTagModern : getTagLegacy;\n","import { getCleanClone, getRegExpFlags } from './utils';\n\nimport type { Cache } from './utils';\n\nexport type InternalCopier<Value = any> = (value: Value, state: State) => Value;\n\nexport interface State {\n  Constructor: any;\n  cache: Cache;\n  copier: InternalCopier;\n  prototype: any;\n}\n\nconst {\n  defineProperty,\n  getOwnPropertyDescriptor,\n  getOwnPropertyNames,\n  getOwnPropertySymbols,\n} = Object;\nconst { hasOwnProperty, propertyIsEnumerable } = Object.prototype;\n\nconst SUPPORTS_SYMBOL = typeof getOwnPropertySymbols === 'function';\n\nfunction getStrictPropertiesModern(object: any): Array<string | symbol> {\n  return (getOwnPropertyNames(object) as Array<string | symbol>).concat(\n    getOwnPropertySymbols(object)\n  );\n}\n\nconst getStrictProperties = SUPPORTS_SYMBOL\n  ? getStrictPropertiesModern\n  : getOwnPropertyNames;\n\nfunction copyOwnPropertiesStrict<Value extends any>(\n  value: Value,\n  clone: Value,\n  state: State\n): Value {\n  const properties = getStrictProperties(value);\n  const { copier } = state;\n\n  for (\n    let index = 0, length = properties.length, property, descriptor;\n    index < length;\n    ++index\n  ) {\n    property = properties[index];\n\n    if (property === 'callee' || property === 'caller') {\n      continue;\n    }\n\n    descriptor = getOwnPropertyDescriptor(value, property);\n\n    if (!descriptor) {\n      // In extra edge cases where the property descriptor cannot be retrived, fall back to\n      // the loose assignment.\n      (clone as any)[property] = copier((value as any)[property], state);\n      continue;\n    }\n\n    // Only clone the value if actually a value, not a getter / setter.\n    if (!descriptor.get && !descriptor.set) {\n      descriptor.value = copier(descriptor.value, state);\n    }\n\n    try {\n      defineProperty(clone, property, descriptor);\n    } catch (error) {\n      // Tee above can fail on node in edge cases, so fall back to the loose assignment.\n      (clone as any)[property] = descriptor.value;\n    }\n  }\n\n  return clone;\n}\n\nexport function copyArrayLoose(array: any[], state: State) {\n  const clone = new state.Constructor();\n  const { cache, copier } = state;\n\n  cache.set(array, clone);\n\n  for (let index: number = 0, length = array.length; index < length; ++index) {\n    clone[index] = copier(array[index], state);\n  }\n\n  return clone;\n}\n\nexport function copyArrayStrict<Value extends any[]>(\n  array: Value,\n  state: State\n) {\n  const clone = new state.Constructor() as Value;\n\n  state.cache.set(array, clone);\n\n  return copyOwnPropertiesStrict(array, clone, state);\n}\n\nexport function copyArrayBuffer<Value extends ArrayBuffer>(\n  arrayBuffer: Value,\n  _state: State\n): Value {\n  return arrayBuffer.slice(0) as Value;\n}\n\nexport function copyBlob<Value extends Blob>(\n  blob: Value,\n  _state: State\n): Value {\n  return blob.slice(0, blob.size, blob.type) as Value;\n}\n\nexport function copyDataView<Value extends DataView>(\n  dataView: Value,\n  state: State\n): Value {\n  return new state.Constructor(copyArrayBuffer(dataView.buffer, state));\n}\n\nexport function copyDate<Value extends Date>(date: Value, state: State): Value {\n  return new state.Constructor(date.getTime());\n}\n\nexport function copyMapLoose<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n  const { cache, copier } = state;\n\n  cache.set(map, clone);\n\n  map.forEach((value, key) => {\n    clone.set(key, copier(value, state));\n  });\n\n  return clone;\n}\n\nexport function copyMapStrict<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n) {\n  return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);\n}\n\nfunction copyObjectLooseLegacy<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n  const { cache, copier } = state;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = copier(object[key], state);\n    }\n  }\n\n  return clone;\n}\n\nfunction copyObjectLooseModern<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n  const { cache, copier } = state;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = copier(object[key], state);\n    }\n  }\n\n  const symbols: symbol[] = getOwnPropertySymbols(object);\n\n  for (\n    let index = 0, length = symbols.length, symbol;\n    index < length;\n    ++index\n  ) {\n    symbol = symbols[index];\n\n    if (propertyIsEnumerable.call(object, symbol)) {\n      clone[symbol] = copier((object as any)[symbol], state);\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Get a copy of the object based on loose rules, meaning all enumerable keys\n * and symbols are copied, but property descriptors are not considered.\n */\nexport const copyObjectLoose = SUPPORTS_SYMBOL\n  ? copyObjectLooseModern\n  : copyObjectLooseLegacy;\n\n/**\n * Get a copy of the object based on strict rules, meaning all keys and symbols\n * are copied based on the original property descriptors.\n */\nexport function copyObjectStrict<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  return copyOwnPropertiesStrict(object, clone, state);\n}\n\nexport function copyRegExp<Value extends RegExp>(\n  regExp: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor(\n    regExp.source,\n    getRegExpFlags(regExp)\n  ) as Value;\n\n  clone.lastIndex = regExp.lastIndex;\n\n  return clone;\n}\n\nexport function copySelf<Value>(value: Value, _state: State): Value {\n  return value;\n}\n\nexport function copySetLoose<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n  const { cache, copier } = state;\n\n  cache.set(set, clone);\n\n  set.forEach((value) => {\n    clone.add(copier(value, state));\n  });\n\n  return clone;\n}\n\nexport function copySetStrict<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);\n}\n","import {\n  copyArrayBuffer,\n  copyArrayLoose,\n  copyArrayStrict,\n  copyBlob,\n  copyDataView,\n  copyDate,\n  copyMapLoose,\n  copyMapStrict,\n  copyObjectLoose,\n  copyObjectStrict,\n  copyRegExp,\n  copySelf,\n  copySetLoose,\n  copySetStrict,\n} from './copier';\nimport { createCache, getTag } from './utils';\n\nimport type { InternalCopier, State } from './copier';\n\nexport type { State } from './copier';\n\nconst { isArray } = Array;\nconst { getPrototypeOf } = Object;\n\nexport interface CreateCopierOptions {\n  array?: InternalCopier<any[]>;\n  arrayBuffer?: InternalCopier<ArrayBuffer>;\n  blob?: InternalCopier<Blob>;\n  dataView?: InternalCopier<DataView>;\n  date?: InternalCopier<Date>;\n  error?: InternalCopier<any>;\n  map?: InternalCopier<Map<any, any>>;\n  object?: InternalCopier<Record<string, any>>;\n  regExp?: InternalCopier<RegExp>;\n  set?: InternalCopier<Set<any>>;\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed.\n */\nexport function createCopier(options: CreateCopierOptions) {\n  const {\n    array = copyArrayLoose,\n    arrayBuffer = copyArrayBuffer,\n    blob = copyBlob,\n    dataView = copyDataView,\n    date = copyDate,\n    error = copySelf,\n    map = copyMapLoose,\n    object = copyObjectLoose,\n    regExp = copyRegExp,\n    set = copySetLoose,\n  } = options;\n\n  const tagSpecificCopiers: Record<string, InternalCopier> = {\n    Array: array,\n    ArrayBuffer: arrayBuffer,\n    Blob: blob,\n    DataView: dataView,\n    Date: date,\n    Error: error,\n    Float32Array: arrayBuffer,\n    Float64Array: arrayBuffer,\n    Int8Array: arrayBuffer,\n    Int16Array: arrayBuffer,\n    Int32Array: arrayBuffer,\n    Map: map,\n    Object: object,\n    Promise: copySelf,\n    RegExp: regExp,\n    Set: set,\n    WeakMap: copySelf,\n    WeakSet: copySelf,\n    Uint8Array: arrayBuffer,\n    Uint8ClampedArray: arrayBuffer,\n    Uint16Array: arrayBuffer,\n    Uint32Array: arrayBuffer,\n    Uint64Array: arrayBuffer,\n  };\n\n  function copier(value: any, state: State): any {\n    state.prototype = state.Constructor = undefined;\n\n    if (!value || typeof value !== 'object') {\n      return value;\n    }\n\n    if (state.cache.has(value)) {\n      return state.cache.get(value);\n    }\n\n    state.prototype = value.__proto__ || getPrototypeOf(value);\n    state.Constructor = state.prototype && state.prototype.constructor;\n\n    // plain objects\n    if (!state.Constructor || state.Constructor === Object) {\n      return object(value, state);\n    }\n\n    // arrays\n    if (isArray(value)) {\n      return array(value, state);\n    }\n\n    const tagSpecificCopier = tagSpecificCopiers[getTag(value)];\n\n    if (tagSpecificCopier) {\n      return tagSpecificCopier(value, state);\n    }\n\n    return typeof value.then === 'function' ? value : object(value, state);\n  }\n\n  return function copy<Value>(value: Value): Value {\n    return copier(value, {\n      Constructor: undefined,\n      cache: createCache(),\n      copier,\n      prototype: undefined,\n    });\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed, defaulting to the\n * same internals as `copyStrict`.\n */\nexport function createStrictCopier(options: CreateCopierOptions) {\n  return createCopier(\n    Object.assign(\n      {\n        array: copyArrayStrict,\n        map: copyMapStrict,\n        object: copyObjectStrict,\n        set: copySetStrict,\n      },\n      options\n    )\n  );\n}\n\n/**\n * Copy an value deeply as much as possible, where strict recreation of object properties\n * are maintained. All properties (including non-enumerable ones) are copied with their\n * original property descriptors on both objects and arrays.\n */\nexport const copyStrict = createStrictCopier({});\n\n/**\n * Copy an value deeply as much as possible.\n */\nexport default 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This includes both keys and symbols.\n */\nconst getStrictProperties = SUPPORTS_SYMBOL\n  ? getStrictPropertiesModern\n  : getOwnPropertyNames;\n\n/**\n * Striclty copy all properties contained on the object.\n */\nfunction copyOwnPropertiesStrict<Value>(\n  value: Value,\n  clone: Value,\n  state: State\n): Value {\n  const properties = getStrictProperties(value);\n\n  for (\n    let index = 0, length = properties.length, property, descriptor;\n    index < length;\n    ++index\n  ) {\n    property = properties[index];\n\n    if (property === 'callee' || property === 'caller') {\n      continue;\n    }\n\n    descriptor = getOwnPropertyDescriptor(value, property);\n\n    if (!descriptor) {\n      // In extra edge cases where the property descriptor cannot be retrived, fall back to\n      // the loose assignment.\n      (clone as any)[property] = state.copier((value as any)[property], state);\n      continue;\n    }\n\n    // Only clone the value if actually a value, not a getter / 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state: State\n) {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(array, clone);\n\n  return copyOwnPropertiesStrict(array, clone, state);\n}\n\n/**\n * Copy the contents of the ArrayBuffer.\n */\nexport function copyArrayBuffer<Value extends ArrayBuffer>(\n  arrayBuffer: Value,\n  _state: State\n): Value {\n  return arrayBuffer.slice(0) as Value;\n}\n\n/**\n * Create a new Blob with the contents of the original.\n */\nexport function copyBlob<Value extends Blob>(\n  blob: Value,\n  _state: State\n): Value {\n  return blob.slice(0, blob.size, blob.type) as Value;\n}\n\n/**\n * Create a new DataView with the contents of the original.\n */\nexport function copyDataView<Value extends DataView>(\n  dataView: Value,\n  state: State\n): Value {\n  return new state.Constructor(copyArrayBuffer(dataView.buffer, state));\n}\n\n/**\n * Create a new Date based on the time of the original.\n */\nexport function copyDate<Value extends Date>(date: Value, state: State): Value {\n  return new state.Constructor(date.getTime());\n}\n\n/**\n * Deeply copy the keys and values of the original.\n */\nexport function copyMapLoose<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(map, clone);\n\n  map.forEach((value, key) => {\n    clone.set(key, state.copier(value, state));\n  });\n\n  return clone;\n}\n\n/**\n * Deeply copy the keys and values of the original, as well as any custom properties.\n */\nexport function copyMapStrict<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n) {\n  return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);\n}\n\nfunction copyObjectLooseLegacy<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = state.copier(object[key], state);\n    }\n  }\n\n  return clone;\n}\n\nfunction copyObjectLooseModern<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = state.copier(object[key], state);\n    }\n  }\n\n  const symbols = getOwnPropertySymbols(object);\n\n  for (\n    let index = 0, length = symbols.length, symbol;\n    index < length;\n    ++index\n  ) {\n    symbol = symbols[index];\n\n    if (propertyIsEnumerable.call(object, symbol)) {\n      clone[symbol] 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Value extends Boolean | Number | String\n>(primitiveObject: Value, state: State): Value {\n  return new state.Constructor(primitiveObject.valueOf());\n}\n\n/**\n * Create a new RegExp based on the value and flags of the original.\n */\nexport function copyRegExp<Value extends RegExp>(\n  regExp: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor(\n    regExp.source,\n    getRegExpFlags(regExp)\n  ) as Value;\n\n  clone.lastIndex = regExp.lastIndex;\n\n  return clone;\n}\n\n/**\n * Return the original value (an identity function).\n *\n * @note\n * THis is used for objects that cannot be copied, such as WeakMap.\n */\nexport function copySelf<Value>(value: Value, _state: State): Value {\n  return value;\n}\n\n/**\n * Deeply copy the values of the original.\n */\nexport function copySetLoose<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(set, clone);\n\n  set.forEach((value) => {\n    clone.add(state.copier(value, state));\n  });\n\n  return clone;\n}\n\n/**\n * Deeply copy the values of the original, as well as any custom properties.\n */\nexport function copySetStrict<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);\n}\n","import {\n  copyArrayBuffer,\n  copyArrayLoose,\n  copyArrayStrict,\n  copyBlob,\n  copyDataView,\n  copyDate,\n  copyMapLoose,\n  copyMapStrict,\n  copyObjectLoose,\n  copyObjectStrict,\n  copyPrimitiveWrapper,\n  copyRegExp,\n  copySelf,\n  copySetLoose,\n  copySetStrict,\n} from './copier';\nimport { createCache, getTag } from './utils';\n\nimport type { InternalCopier, State } from './copier';\n\nexport type { State } from './copier';\n\nconst { isArray } = Array;\nconst { assign, getPrototypeOf } = Object;\n\nexport interface CreateCopierOptions {\n  array?: InternalCopier<any[]>;\n  arrayBuffer?: InternalCopier<ArrayBuffer>;\n  blob?: InternalCopier<Blob>;\n  dataView?: InternalCopier<DataView>;\n  date?: InternalCopier<Date>;\n  error?: InternalCopier<any>;\n  map?: InternalCopier<Map<any, any>>;\n  object?: InternalCopier<Record<string, any>>;\n  regExp?: InternalCopier<RegExp>;\n  set?: InternalCopier<Set<any>>;\n}\n\nconst DEFAULT_LOOSE_OPTIONS: Required<CreateCopierOptions> = {\n  array: copyArrayLoose,\n  arrayBuffer: copyArrayBuffer,\n  blob: copyBlob,\n  dataView: copyDataView,\n  date: copyDate,\n  error: copySelf,\n  map: copyMapLoose,\n  object: copyObjectLoose,\n  regExp: copyRegExp,\n  set: copySetLoose,\n};\nconst DEFAULT_STRICT_OPTIONS: Required<CreateCopierOptions> = assign(\n  {},\n  DEFAULT_LOOSE_OPTIONS,\n  {\n    array: copyArrayStrict,\n    map: copyMapStrict,\n    object: copyObjectStrict,\n    set: copySetStrict,\n  }\n);\n\n/**\n * Get the copiers used for each specific object tag.\n */\nfunction getTagSpecificCopiers(\n  options: Required<CreateCopierOptions>\n): Record<string, InternalCopier<any>> {\n  return {\n    Arguments: options.object,\n    Array: options.array,\n    ArrayBuffer: options.arrayBuffer,\n    Blob: options.blob,\n    Boolean: copyPrimitiveWrapper,\n    DataView: options.dataView,\n    Date: options.date,\n    Error: options.error,\n    Float32Array: options.arrayBuffer,\n    Float64Array: options.arrayBuffer,\n    Int8Array: options.arrayBuffer,\n    Int16Array: options.arrayBuffer,\n    Int32Array: options.arrayBuffer,\n    Map: options.map,\n    Number: copyPrimitiveWrapper,\n    Object: options.object,\n    Promise: copySelf,\n    RegExp: options.regExp,\n    Set: options.set,\n    String: copyPrimitiveWrapper,\n    WeakMap: copySelf,\n    WeakSet: copySelf,\n    Uint8Array: options.arrayBuffer,\n    Uint8ClampedArray: options.arrayBuffer,\n    Uint16Array: options.arrayBuffer,\n    Uint32Array: options.arrayBuffer,\n    Uint64Array: options.arrayBuffer,\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed.\n */\nexport function createCopier(options: CreateCopierOptions) {\n  const normalizedOptions = assign({}, DEFAULT_LOOSE_OPTIONS, options);\n  const tagSpecificCopiers = getTagSpecificCopiers(normalizedOptions);\n  const { Array: array, Object: object } = tagSpecificCopiers;\n\n  function copier(value: any, state: State): any {\n    state.prototype = state.Constructor = undefined;\n\n    if (!value || typeof value !== 'object') {\n      return value;\n    }\n\n    if (state.cache.has(value)) {\n      return state.cache.get(value);\n    }\n\n    state.prototype = value.__proto__ || getPrototypeOf(value);\n    state.Constructor = state.prototype && state.prototype.constructor;\n\n    // plain objects\n    if (!state.Constructor || state.Constructor === Object) {\n      return object(value, state);\n    }\n\n    // arrays\n    if (isArray(value)) {\n      return array(value, state);\n    }\n\n    const tagSpecificCopier = tagSpecificCopiers[getTag(value)];\n\n    if (tagSpecificCopier) {\n      return tagSpecificCopier(value, state);\n    }\n\n    return typeof value.then === 'function' ? value : object(value, state);\n  }\n\n  return function copy<Value>(value: Value): Value {\n    return copier(value, {\n      Constructor: undefined,\n      cache: createCache(),\n      copier,\n      prototype: undefined,\n    });\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed, defaulting to the\n * same internals as `copyStrict`.\n */\nexport function createStrictCopier(options: CreateCopierOptions) {\n  return createCopier(assign({}, DEFAULT_STRICT_OPTIONS, options));\n}\n\n/**\n * Copy an value deeply as much as possible, where strict recreation of object properties\n * are maintained. All properties (including non-enumerable ones) are copied with their\n * original property descriptors on both objects and arrays.\n */\nexport const copyStrict = createStrictCopier({});\n\n/**\n * Copy an value deeply as much as possible.\n */\nexport default 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dist/cjs/types/copier.d.ts

 import type { Cache } from './utils';
-export declare type InternalCopier<Value = any> = (value: Value, state: State) => Value;
+export declare type InternalCopier<Value> = (value: Value, state: State) => Value;
 export interface State {
     Constructor: any;
     cache: Cache;
-    copier: InternalCopier;
+    copier: InternalCopier<any>;
     prototype: any;
 }
+/**
+ * Deeply copy the indexed values in the array.
+ */
 export declare function copyArrayLoose(array: any[], state: State): any;
+/**
+ * Deeply copy the indexed values in the array, as well as any custom properties.
+ */
 export declare function copyArrayStrict<Value extends any[]>(array: Value, state: State): Value;
+/**
+ * Copy the contents of the ArrayBuffer.
+ */
 export declare function copyArrayBuffer<Value extends ArrayBuffer>(arrayBuffer: Value, _state: State): Value;
+/**
+ * Create a new Blob with the contents of the original.
+ */
 export declare function copyBlob<Value extends Blob>(blob: Value, _state: State): Value;
+/**
+ * Create a new DataView with the contents of the original.
+ */
 export declare function copyDataView<Value extends DataView>(dataView: Value, state: State): Value;
+/**
+ * Create a new Date based on the time of the original.
+ */
 export declare function copyDate<Value extends Date>(date: Value, state: State): Value;
+/**
+ * Deeply copy the keys and values of the original.
+ */
 export declare function copyMapLoose<Value extends Map<any, any>>(map: Value, state: State): Value;
+/**
+ * Deeply copy the keys and values of the original, as well as any custom properties.
+ */
 export declare function copyMapStrict<Value extends Map<any, any>>(map: Value, state: State): Value;
-declare function copyObjectLooseModern<Value extends {}>(object: Value, state: State): Value;
+declare function copyObjectLooseModern<Value extends Record<string, any>>(object: Value, state: State): Value;
 /**
- * Get a copy of the object based on loose rules, meaning all enumerable keys
- * and symbols are copied, but property descriptors are not considered.
+ * Deeply copy the properties (keys and symbols) and values of the original.
  */
 export declare const copyObjectLoose: typeof copyObjectLooseModern;
 /**
- * Get a copy of the object based on strict rules, meaning all keys and symbols
- * are copied based on the original property descriptors.
+ * Deeply copy the properties (keys and symbols) and values of the original, as well
+ * as any hidden or non-enumerable properties.
  */
-export declare function copyObjectStrict<Value extends {}>(object: Value, state: State): Value;
+export declare function copyObjectStrict<Value extends Record<string, any>>(object: Value, state: State): Value;
+/**
+ * Create a new primitive wrapper from the value of the original.
+ */
+export declare function copyPrimitiveWrapper<Value extends Boolean | Number | String>(primitiveObject: Value, state: State): Value;
+/**
+ * Create a new RegExp based on the value and flags of the original.
+ */
 export declare function copyRegExp<Value extends RegExp>(regExp: Value, state: State): Value;
+/**
+ * Return the original value (an identity function).
+ *
+ * @note
+ * THis is used for objects that cannot be copied, such as WeakMap.
+ */
 export declare function copySelf<Value>(value: Value, _state: State): Value;
+/**
+ * Deeply copy the values of the original.
+ */
 export declare function copySetLoose<Value extends Set<any>>(set: Value, state: State): Value;
+/**
+ * Deeply copy the values of the original, as well as any custom properties.
+ */
 export declare function copySetStrict<Value extends Set<any>>(set: Value, state: State): Value;
 export {};

dist/cjs/types/utils.d.ts

 export interface Cache {
-    _keys?: any[];
-    _values?: any[];
     has: (value: any) => boolean;
@@ -22,7 +20,7 @@ set: (key: any, value: any) => void;
 export declare const getRegExpFlags: typeof getRegExpFlagsModern;
-declare function getTagModern(value: any): string;
+declare function getTagLegacy(value: any): string;
 /**
  * Get the tag of the value passed, so that the correct copier can be used.
  */
-export declare const getTag: typeof getTagModern;
+export declare const getTag: typeof getTagLegacy;
 export {};

dist/esm/index.mjs

 var toStringFunction = Function.prototype.toString;
 var create = Object.create;
 var toStringObject = Object.prototype.toString;
+/**
+ * @classdesc Fallback cache for when WeakMap is not natively supported
+ */
 var LegacyCache = /** @class */ (function () {
@@ -94,8 +97,13 @@ function LegacyCache() {
 }
+/**
+ * Get the properites used when copying objects strictly. This includes both keys and symbols.
+ */
 var getStrictProperties = SUPPORTS_SYMBOL
     ? getStrictPropertiesModern
     : getOwnPropertyNames;
+/**
+ * Striclty copy all properties contained on the object.
+ */
 function copyOwnPropertiesStrict(value, clone, state) {
     var properties = getStrictProperties(value);
-    var copier = state.copier;
     for (var index = 0, length_1 = properties.length, property = void 0, descriptor = void 0; index < length_1; ++index) {
@@ -110,3 +118,3 @@ property = properties[index];
             // the loose assignment.
-            clone[property] = copier(value[property], state);
+            clone[property] = state.copier(value[property], state);
             continue;
@@ -116,3 +124,3 @@ }
         if (!descriptor.get && !descriptor.set) {
-            descriptor.value = copier(descriptor.value, state);
+            descriptor.value = state.copier(descriptor.value, state);
         }
@@ -129,37 +137,62 @@ try {
 }
+/**
+ * Deeply copy the indexed values in the array.
+ */
 function copyArrayLoose(array, state) {
     var clone = new state.Constructor();
-    var cache = state.cache, copier = state.copier;
-    cache.set(array, clone);
+    // set in the cache immediately to be able to reuse the object recursively
+    state.cache.set(array, clone);
     for (var index = 0, length_2 = array.length; index < length_2; ++index) {
-        clone[index] = copier(array[index], state);
+        clone[index] = state.copier(array[index], state);
     }
     return clone;
 }
+/**
+ * Deeply copy the indexed values in the array, as well as any custom properties.
+ */
 function copyArrayStrict(array, state) {
     var clone = new state.Constructor();
+    // set in the cache immediately to be able to reuse the object recursively
     state.cache.set(array, clone);
     return copyOwnPropertiesStrict(array, clone, state);
 }
+/**
+ * Copy the contents of the ArrayBuffer.
+ */
 function copyArrayBuffer(arrayBuffer, _state) {
     return arrayBuffer.slice(0);
 }
+/**
+ * Create a new Blob with the contents of the original.
+ */
 function copyBlob(blob, _state) {
     return blob.slice(0, blob.size, blob.type);
 }
+/**
+ * Create a new DataView with the contents of the original.
+ */
 function copyDataView(dataView, state) {
     return new state.Constructor(copyArrayBuffer(dataView.buffer));
 }
+/**
+ * Create a new Date based on the time of the original.
+ */
 function copyDate(date, state) {
     return new state.Constructor(date.getTime());
 }
+/**
+ * Deeply copy the keys and values of the original.
+ */
 function copyMapLoose(map, state) {
     var clone = new state.Constructor();
-    var cache = state.cache, copier = state.copier;
-    cache.set(map, clone);
+    // set in the cache immediately to be able to reuse the object recursively
+    state.cache.set(map, clone);
     map.forEach(function (value, key) {
-        clone.set(key, copier(value, state));
+        clone.set(key, state.copier(value, state));
     });
     return clone;
 }
+/**
+ * Deeply copy the keys and values of the original, as well as any custom properties.
+ */
 function copyMapStrict(map, state) {
@@ -170,8 +203,7 @@ return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);
     var clone = getCleanClone(state.prototype);
-    var cache = state.cache, copier = state.copier;
     // set in the cache immediately to be able to reuse the object recursively
-    cache.set(object, clone);
+    state.cache.set(object, clone);
     for (var key in object) {
         if (hasOwnProperty.call(object, key)) {
-            clone[key] = copier(object[key], state);
+            clone[key] = state.copier(object[key], state);
         }
@@ -183,8 +215,7 @@ }
     var clone = getCleanClone(state.prototype);
-    var cache = state.cache, copier = state.copier;
     // set in the cache immediately to be able to reuse the object recursively
-    cache.set(object, clone);
+    state.cache.set(object, clone);
     for (var key in object) {
         if (hasOwnProperty.call(object, key)) {
-            clone[key] = copier(object[key], state);
+            clone[key] = state.copier(object[key], state);
         }
@@ -196,3 +227,3 @@ }
         if (propertyIsEnumerable.call(object, symbol)) {
-            clone[symbol] = copier(object[symbol], state);
+            clone[symbol] = state.copier(object[symbol], state);
         }
@@ -203,4 +234,3 @@ }
 /**
- * Get a copy of the object based on loose rules, meaning all enumerable keys
- * and symbols are copied, but property descriptors are not considered.
+ * Deeply copy the properties (keys and symbols) and values of the original.
  */
@@ -211,4 +241,4 @@ var copyObjectLoose = SUPPORTS_SYMBOL
 /**
- * Get a copy of the object based on strict rules, meaning all keys and symbols
- * are copied based on the original property descriptors.
+ * Deeply copy the properties (keys and symbols) and values of the original, as well
+ * as any hidden or non-enumerable properties.
  */
@@ -221,2 +251,11 @@ function copyObjectStrict(object, state) {
 }
+/**
+ * Create a new primitive wrapper from the value of the original.
+ */
+function copyPrimitiveWrapper(primitiveObject, state) {
+    return new state.Constructor(primitiveObject.valueOf());
+}
+/**
+ * Create a new RegExp based on the value and flags of the original.
+ */
 function copyRegExp(regExp, state) {
@@ -227,14 +266,26 @@ var clone = new state.Constructor(regExp.source, getRegExpFlags(regExp));
 }
+/**
+ * Return the original value (an identity function).
+ *
+ * @note
+ * THis is used for objects that cannot be copied, such as WeakMap.
+ */
 function copySelf(value, _state) {
     return value;
 }
+/**
+ * Deeply copy the values of the original.
+ */
 function copySetLoose(set, state) {
     var clone = new state.Constructor();
-    var cache = state.cache, copier = state.copier;
-    cache.set(set, clone);
+    // set in the cache immediately to be able to reuse the object recursively
+    state.cache.set(set, clone);
     set.forEach(function (value) {
-        clone.add(copier(value, state));
+        clone.add(state.copier(value, state));
     });
     return clone;
 }
+/**
+ * Deeply copy the values of the original, as well as any custom properties.
+ */
 function copySetStrict(set, state) {
@@ -245,33 +296,62 @@ return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);
 var isArray = Array.isArray;
-var getPrototypeOf = Object.getPrototypeOf;
+var assign = Object.assign, getPrototypeOf = Object.getPrototypeOf;
+var DEFAULT_LOOSE_OPTIONS = {
+    array: copyArrayLoose,
+    arrayBuffer: copyArrayBuffer,
+    blob: copyBlob,
+    dataView: copyDataView,
+    date: copyDate,
+    error: copySelf,
+    map: copyMapLoose,
+    object: copyObjectLoose,
+    regExp: copyRegExp,
+    set: copySetLoose,
+};
+var DEFAULT_STRICT_OPTIONS = assign({}, DEFAULT_LOOSE_OPTIONS, {
+    array: copyArrayStrict,
+    map: copyMapStrict,
+    object: copyObjectStrict,
+    set: copySetStrict,
+});
 /**
- * Create a custom copier based on the object-specific copy methods passed.
+ * Get the copiers used for each specific object tag.
  */
-function createCopier(options) {
-    var _a = options.array, array = _a === void 0 ? copyArrayLoose : _a, _b = options.arrayBuffer, arrayBuffer = _b === void 0 ? copyArrayBuffer : _b, _c = options.blob, blob = _c === void 0 ? copyBlob : _c, _d = options.dataView, dataView = _d === void 0 ? copyDataView : _d, _e = options.date, date = _e === void 0 ? copyDate : _e, _f = options.error, error = _f === void 0 ? copySelf : _f, _g = options.map, map = _g === void 0 ? copyMapLoose : _g, _h = options.object, object = _h === void 0 ? copyObjectLoose : _h, _j = options.regExp, regExp = _j === void 0 ? copyRegExp : _j, _k = options.set, set = _k === void 0 ? copySetLoose : _k;
-    var tagSpecificCopiers = {
-        Array: array,
-        ArrayBuffer: arrayBuffer,
-        Blob: blob,
-        DataView: dataView,
-        Date: date,
-        Error: error,
-        Float32Array: arrayBuffer,
-        Float64Array: arrayBuffer,
-        Int8Array: arrayBuffer,
-        Int16Array: arrayBuffer,
-        Int32Array: arrayBuffer,
-        Map: map,
-        Object: object,
+function getTagSpecificCopiers(options) {
+    return {
+        Arguments: options.object,
+        Array: options.array,
+        ArrayBuffer: options.arrayBuffer,
+        Blob: options.blob,
+        Boolean: copyPrimitiveWrapper,
+        DataView: options.dataView,
+        Date: options.date,
+        Error: options.error,
+        Float32Array: options.arrayBuffer,
+        Float64Array: options.arrayBuffer,
+        Int8Array: options.arrayBuffer,
+        Int16Array: options.arrayBuffer,
+        Int32Array: options.arrayBuffer,
+        Map: options.map,
+        Number: copyPrimitiveWrapper,
+        Object: options.object,
         Promise: copySelf,
-        RegExp: regExp,
-        Set: set,
+        RegExp: options.regExp,
+        Set: options.set,
+        String: copyPrimitiveWrapper,
         WeakMap: copySelf,
         WeakSet: copySelf,
-        Uint8Array: arrayBuffer,
-        Uint8ClampedArray: arrayBuffer,
-        Uint16Array: arrayBuffer,
-        Uint32Array: arrayBuffer,
-        Uint64Array: arrayBuffer,
+        Uint8Array: options.arrayBuffer,
+        Uint8ClampedArray: options.arrayBuffer,
+        Uint16Array: options.arrayBuffer,
+        Uint32Array: options.arrayBuffer,
+        Uint64Array: options.arrayBuffer,
     };
+}
+/**
+ * Create a custom copier based on the object-specific copy methods passed.
+ */
+function createCopier(options) {
+    var normalizedOptions = assign({}, DEFAULT_LOOSE_OPTIONS, options);
+    var tagSpecificCopiers = getTagSpecificCopiers(normalizedOptions);
+    var array = tagSpecificCopiers.Array, object = tagSpecificCopiers.Object;
     function copier(value, state) {
@@ -315,8 +395,3 @@ state.prototype = state.Constructor = undefined;
 function createStrictCopier(options) {
-    return createCopier(Object.assign({
-        array: copyArrayStrict,
-        map: copyMapStrict,
-        object: copyObjectStrict,
-        set: copySetStrict,
-    }, options));
+    return createCopier(assign({}, DEFAULT_STRICT_OPTIONS, options));
 }
@@ -323,0 +398,0 @@ /**

dist/esm/index.mjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"index.mjs","sources":["../../../../src/utils.ts","../../../../src/copier.ts","../../../../src/index.ts"],"sourcesContent":["import type { CreateCopierOptions } from './index';\n\nexport interface Cache {\n  _keys?: any[];\n  _values?: any[];\n  has: (value: any) => boolean;\n  set: (key: any, value: any) => void;\n  get: (key: any) => any;\n}\n\nconst { toString: toStringFunction } = Function.prototype;\nconst { create } = Object;\nconst { toString: toStringObject } = Object.prototype;\n\nclass LegacyCache {\n  _keys: any[] = [];\n  _values: any[] = [];\n\n  has(key: any) {\n    return !!~this._keys.indexOf(key);\n  }\n\n  get(key: any) {\n    return this._values[this._keys.indexOf(key)];\n  }\n\n  set(key: any, value: any) {\n    this._keys.push(key);\n    this._values.push(value);\n  }\n}\n\nfunction createCacheLegacy(): Cache {\n  return new LegacyCache();\n}\n\nfunction createCacheModern(): Cache {\n  return new WeakMap();\n}\n\n/**\n * Get a new cache object to prevent circular references.\n */\nexport const createCache =\n  typeof WeakMap !== 'undefined' ? createCacheModern : createCacheLegacy;\n\n/**\n * Get an empty version of the object with the same prototype it has.\n */\nexport function getCleanClone(prototype: any): any {\n  if (!prototype) {\n    return create(null);\n  }\n\n  const Constructor = prototype.constructor;\n\n  if (Constructor === Object) {\n    return prototype === Object.prototype ? {} : create(prototype);\n  }\n\n  if (~toStringFunction.call(Constructor).indexOf('[native code]')) {\n    try {\n      return new Constructor();\n    } catch {}\n  }\n\n  return create(prototype);\n}\n\nfunction getRegExpFlagsLegacy(regExp: RegExp): string {\n  let flags = '';\n\n  if (regExp.global) {\n    flags += 'g';\n  }\n\n  if (regExp.ignoreCase) {\n    flags += 'i';\n  }\n\n  if (regExp.multiline) {\n    flags += 'm';\n  }\n\n  if (regExp.unicode) {\n    flags += 'u';\n  }\n\n  if (regExp.sticky) {\n    flags += 'y';\n  }\n\n  return flags;\n}\n\nfunction getRegExpFlagsModern(regExp: RegExp): string {\n  return regExp.flags;\n}\n\n/**\n * Get the flags to apply to the copied regexp.\n */\nexport const getRegExpFlags =\n  /test/g.flags === 'g' ? getRegExpFlagsModern : getRegExpFlagsLegacy;\n\nfunction getTagLegacy(value: any): string {\n  const type = toStringObject.call(value);\n\n  return type.substring(8, type.length - 1);\n}\n\nfunction getTagModern(value: any): string {\n  return value[Symbol.toStringTag] || getTagLegacy(value);\n}\n\n/**\n * Get the tag of the value passed, so that the correct copier can be used.\n */\nexport const getTag =\n  typeof Symbol !== 'undefined' ? getTagModern : getTagLegacy;\n","import { getCleanClone, getRegExpFlags } from './utils';\n\nimport type { Cache } from './utils';\n\nexport type InternalCopier<Value = any> = (value: Value, state: State) => Value;\n\nexport interface State {\n  Constructor: any;\n  cache: Cache;\n  copier: InternalCopier;\n  prototype: any;\n}\n\nconst {\n  defineProperty,\n  getOwnPropertyDescriptor,\n  getOwnPropertyNames,\n  getOwnPropertySymbols,\n} = Object;\nconst { hasOwnProperty, propertyIsEnumerable } = Object.prototype;\n\nconst SUPPORTS_SYMBOL = typeof getOwnPropertySymbols === 'function';\n\nfunction getStrictPropertiesModern(object: any): Array<string | symbol> {\n  return (getOwnPropertyNames(object) as Array<string | symbol>).concat(\n    getOwnPropertySymbols(object)\n  );\n}\n\nconst getStrictProperties = SUPPORTS_SYMBOL\n  ? getStrictPropertiesModern\n  : getOwnPropertyNames;\n\nfunction copyOwnPropertiesStrict<Value extends any>(\n  value: Value,\n  clone: Value,\n  state: State\n): Value {\n  const properties = getStrictProperties(value);\n  const { copier } = state;\n\n  for (\n    let index = 0, length = properties.length, property, descriptor;\n    index < length;\n    ++index\n  ) {\n    property = properties[index];\n\n    if (property === 'callee' || property === 'caller') {\n      continue;\n    }\n\n    descriptor = getOwnPropertyDescriptor(value, property);\n\n    if (!descriptor) {\n      // In extra edge cases where the property descriptor cannot be retrived, fall back to\n      // the loose assignment.\n      (clone as any)[property] = copier((value as any)[property], state);\n      continue;\n    }\n\n    // Only clone the value if actually a value, not a getter / setter.\n    if (!descriptor.get && !descriptor.set) {\n      descriptor.value = copier(descriptor.value, state);\n    }\n\n    try {\n      defineProperty(clone, property, descriptor);\n    } catch (error) {\n      // Tee above can fail on node in edge cases, so fall back to the loose assignment.\n      (clone as any)[property] = descriptor.value;\n    }\n  }\n\n  return clone;\n}\n\nexport function copyArrayLoose(array: any[], state: State) {\n  const clone = new state.Constructor();\n  const { cache, copier } = state;\n\n  cache.set(array, clone);\n\n  for (let index: number = 0, length = array.length; index < length; ++index) {\n    clone[index] = copier(array[index], state);\n  }\n\n  return clone;\n}\n\nexport function copyArrayStrict<Value extends any[]>(\n  array: Value,\n  state: State\n) {\n  const clone = new state.Constructor() as Value;\n\n  state.cache.set(array, clone);\n\n  return copyOwnPropertiesStrict(array, clone, state);\n}\n\nexport function copyArrayBuffer<Value extends ArrayBuffer>(\n  arrayBuffer: Value,\n  _state: State\n): Value {\n  return arrayBuffer.slice(0) as Value;\n}\n\nexport function copyBlob<Value extends Blob>(\n  blob: Value,\n  _state: State\n): Value {\n  return blob.slice(0, blob.size, blob.type) as Value;\n}\n\nexport function copyDataView<Value extends DataView>(\n  dataView: Value,\n  state: State\n): Value {\n  return new state.Constructor(copyArrayBuffer(dataView.buffer, state));\n}\n\nexport function copyDate<Value extends Date>(date: Value, state: State): Value {\n  return new state.Constructor(date.getTime());\n}\n\nexport function copyMapLoose<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n  const { cache, copier } = state;\n\n  cache.set(map, clone);\n\n  map.forEach((value, key) => {\n    clone.set(key, copier(value, state));\n  });\n\n  return clone;\n}\n\nexport function copyMapStrict<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n) {\n  return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);\n}\n\nfunction copyObjectLooseLegacy<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n  const { cache, copier } = state;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = copier(object[key], state);\n    }\n  }\n\n  return clone;\n}\n\nfunction copyObjectLooseModern<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n  const { cache, copier } = state;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = copier(object[key], state);\n    }\n  }\n\n  const symbols: symbol[] = getOwnPropertySymbols(object);\n\n  for (\n    let index = 0, length = symbols.length, symbol;\n    index < length;\n    ++index\n  ) {\n    symbol = symbols[index];\n\n    if (propertyIsEnumerable.call(object, symbol)) {\n      clone[symbol] = copier((object as any)[symbol], state);\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Get a copy of the object based on loose rules, meaning all enumerable keys\n * and symbols are copied, but property descriptors are not considered.\n */\nexport const copyObjectLoose = SUPPORTS_SYMBOL\n  ? copyObjectLooseModern\n  : copyObjectLooseLegacy;\n\n/**\n * Get a copy of the object based on strict rules, meaning all keys and symbols\n * are copied based on the original property descriptors.\n */\nexport function copyObjectStrict<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  return copyOwnPropertiesStrict(object, clone, state);\n}\n\nexport function copyRegExp<Value extends RegExp>(\n  regExp: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor(\n    regExp.source,\n    getRegExpFlags(regExp)\n  ) as Value;\n\n  clone.lastIndex = regExp.lastIndex;\n\n  return clone;\n}\n\nexport function copySelf<Value>(value: Value, _state: State): Value {\n  return value;\n}\n\nexport function copySetLoose<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n  const { cache, copier } = state;\n\n  cache.set(set, clone);\n\n  set.forEach((value) => {\n    clone.add(copier(value, state));\n  });\n\n  return clone;\n}\n\nexport function copySetStrict<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);\n}\n","import {\n  copyArrayBuffer,\n  copyArrayLoose,\n  copyArrayStrict,\n  copyBlob,\n  copyDataView,\n  copyDate,\n  copyMapLoose,\n  copyMapStrict,\n  copyObjectLoose,\n  copyObjectStrict,\n  copyRegExp,\n  copySelf,\n  copySetLoose,\n  copySetStrict,\n} from './copier';\nimport { createCache, getTag } from './utils';\n\nimport type { InternalCopier, State } from './copier';\n\nexport type { State } from './copier';\n\nconst { isArray } = Array;\nconst { getPrototypeOf } = Object;\n\nexport interface CreateCopierOptions {\n  array?: InternalCopier<any[]>;\n  arrayBuffer?: InternalCopier<ArrayBuffer>;\n  blob?: InternalCopier<Blob>;\n  dataView?: InternalCopier<DataView>;\n  date?: InternalCopier<Date>;\n  error?: InternalCopier<any>;\n  map?: InternalCopier<Map<any, any>>;\n  object?: InternalCopier<Record<string, any>>;\n  regExp?: InternalCopier<RegExp>;\n  set?: InternalCopier<Set<any>>;\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed.\n */\nexport function createCopier(options: CreateCopierOptions) {\n  const {\n    array = copyArrayLoose,\n    arrayBuffer = copyArrayBuffer,\n    blob = copyBlob,\n    dataView = copyDataView,\n    date = copyDate,\n    error = copySelf,\n    map = copyMapLoose,\n    object = copyObjectLoose,\n    regExp = copyRegExp,\n    set = copySetLoose,\n  } = options;\n\n  const tagSpecificCopiers: Record<string, InternalCopier> = {\n    Array: array,\n    ArrayBuffer: arrayBuffer,\n    Blob: blob,\n    DataView: dataView,\n    Date: date,\n    Error: error,\n    Float32Array: arrayBuffer,\n    Float64Array: arrayBuffer,\n    Int8Array: arrayBuffer,\n    Int16Array: arrayBuffer,\n    Int32Array: arrayBuffer,\n    Map: map,\n    Object: object,\n    Promise: copySelf,\n    RegExp: regExp,\n    Set: set,\n    WeakMap: copySelf,\n    WeakSet: copySelf,\n    Uint8Array: arrayBuffer,\n    Uint8ClampedArray: arrayBuffer,\n    Uint16Array: arrayBuffer,\n    Uint32Array: arrayBuffer,\n    Uint64Array: arrayBuffer,\n  };\n\n  function copier(value: any, state: State): any {\n    state.prototype = state.Constructor = undefined;\n\n    if (!value || typeof value !== 'object') {\n      return value;\n    }\n\n    if (state.cache.has(value)) {\n      return state.cache.get(value);\n    }\n\n    state.prototype = value.__proto__ || getPrototypeOf(value);\n    state.Constructor = state.prototype && state.prototype.constructor;\n\n    // plain objects\n    if (!state.Constructor || state.Constructor === Object) {\n      return object(value, state);\n    }\n\n    // arrays\n    if (isArray(value)) {\n      return array(value, state);\n    }\n\n    const tagSpecificCopier = tagSpecificCopiers[getTag(value)];\n\n    if (tagSpecificCopier) {\n      return tagSpecificCopier(value, state);\n    }\n\n    return typeof value.then === 'function' ? value : object(value, state);\n  }\n\n  return function copy<Value>(value: Value): Value {\n    return copier(value, {\n      Constructor: undefined,\n      cache: createCache(),\n      copier,\n      prototype: undefined,\n    });\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed, defaulting to the\n * same internals as `copyStrict`.\n */\nexport function createStrictCopier(options: CreateCopierOptions) {\n  return createCopier(\n    Object.assign(\n      {\n        array: copyArrayStrict,\n        map: copyMapStrict,\n        object: copyObjectStrict,\n        set: copySetStrict,\n      },\n      options\n    )\n  );\n}\n\n/**\n * Copy an value deeply as much as possible, where strict recreation of object properties\n * are maintained. All properties (including non-enumerable ones) are copied with their\n * original property descriptors on both objects and arrays.\n */\nexport const copyStrict = createStrictCopier({});\n\n/**\n * Copy an value deeply as much as possible.\n */\nexport default 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This includes both keys and symbols.\n */\nconst getStrictProperties = SUPPORTS_SYMBOL\n  ? getStrictPropertiesModern\n  : getOwnPropertyNames;\n\n/**\n * Striclty copy all properties contained on the object.\n */\nfunction copyOwnPropertiesStrict<Value>(\n  value: Value,\n  clone: Value,\n  state: State\n): Value {\n  const properties = getStrictProperties(value);\n\n  for (\n    let index = 0, length = properties.length, property, descriptor;\n    index < length;\n    ++index\n  ) {\n    property = properties[index];\n\n    if (property === 'callee' || property === 'caller') {\n      continue;\n    }\n\n    descriptor = getOwnPropertyDescriptor(value, property);\n\n    if (!descriptor) {\n      // In extra edge cases where the property descriptor cannot be retrived, fall back to\n      // the loose assignment.\n      (clone as any)[property] = state.copier((value as any)[property], state);\n      continue;\n    }\n\n    // Only clone the value if actually a value, not a getter / setter.\n    if (!descriptor.get && !descriptor.set) {\n      descriptor.value = state.copier(descriptor.value, state);\n    }\n\n    try {\n      defineProperty(clone, property, descriptor);\n    } catch (error) {\n      // Tee above can fail on node in edge cases, so fall back to the loose assignment.\n      (clone as any)[property] = descriptor.value;\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the indexed values in the array.\n */\nexport function copyArrayLoose(array: any[], state: State) {\n  const clone = new state.Constructor();\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(array, clone);\n\n  for (let index = 0, length = array.length; index < length; ++index) {\n    clone[index] = state.copier(array[index], state);\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the indexed values in the array, as well as any custom properties.\n */\nexport function copyArrayStrict<Value extends any[]>(\n  array: Value,\n  state: State\n) {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(array, clone);\n\n  return copyOwnPropertiesStrict(array, clone, state);\n}\n\n/**\n * Copy the contents of the ArrayBuffer.\n */\nexport function copyArrayBuffer<Value extends ArrayBuffer>(\n  arrayBuffer: Value,\n  _state: State\n): Value {\n  return arrayBuffer.slice(0) as Value;\n}\n\n/**\n * Create a new Blob with the contents of the original.\n */\nexport function copyBlob<Value extends Blob>(\n  blob: Value,\n  _state: State\n): Value {\n  return blob.slice(0, blob.size, blob.type) as Value;\n}\n\n/**\n * Create a new DataView with the contents of the original.\n */\nexport function copyDataView<Value extends DataView>(\n  dataView: Value,\n  state: State\n): Value {\n  return new state.Constructor(copyArrayBuffer(dataView.buffer, state));\n}\n\n/**\n * Create a new Date based on the time of the original.\n */\nexport function copyDate<Value extends Date>(date: Value, state: State): Value {\n  return new state.Constructor(date.getTime());\n}\n\n/**\n * Deeply copy the keys and values of the original.\n */\nexport function copyMapLoose<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(map, clone);\n\n  map.forEach((value, key) => {\n    clone.set(key, state.copier(value, state));\n  });\n\n  return clone;\n}\n\n/**\n * Deeply copy the keys and values of the original, as well as any custom properties.\n */\nexport function copyMapStrict<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n) {\n  return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);\n}\n\nfunction copyObjectLooseLegacy<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = state.copier(object[key], state);\n    }\n  }\n\n  return clone;\n}\n\nfunction copyObjectLooseModern<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = state.copier(object[key], state);\n    }\n  }\n\n  const symbols = getOwnPropertySymbols(object);\n\n  for (\n    let index = 0, length = symbols.length, symbol;\n    index < length;\n    ++index\n  ) {\n    symbol = symbols[index];\n\n    if (propertyIsEnumerable.call(object, symbol)) {\n      clone[symbol] = state.copier((object as any)[symbol], state);\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the properties (keys and symbols) and values of the original.\n */\nexport const copyObjectLoose = SUPPORTS_SYMBOL\n  ? copyObjectLooseModern\n  : copyObjectLooseLegacy;\n\n/**\n * Deeply copy the properties (keys and symbols) and values of the original, as well\n * as any hidden or non-enumerable properties.\n */\nexport function copyObjectStrict<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  return copyOwnPropertiesStrict(object, clone, state);\n}\n\n/**\n * Create a new primitive wrapper from the value of the original.\n */\nexport function copyPrimitiveWrapper<\n  // Specifically use the object constructor types\n  // eslint-disable-next-line @typescript-eslint/ban-types\n  Value extends Boolean | Number | String\n>(primitiveObject: Value, state: State): Value {\n  return new state.Constructor(primitiveObject.valueOf());\n}\n\n/**\n * Create a new RegExp based on the value and flags of the original.\n */\nexport function copyRegExp<Value extends RegExp>(\n  regExp: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor(\n    regExp.source,\n    getRegExpFlags(regExp)\n  ) as Value;\n\n  clone.lastIndex = regExp.lastIndex;\n\n  return clone;\n}\n\n/**\n * Return the original value (an identity function).\n *\n * @note\n * THis is used for objects that cannot be copied, such as WeakMap.\n */\nexport function copySelf<Value>(value: Value, _state: State): Value {\n  return value;\n}\n\n/**\n * Deeply copy the values of the original.\n */\nexport function copySetLoose<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(set, clone);\n\n  set.forEach((value) => {\n    clone.add(state.copier(value, state));\n  });\n\n  return clone;\n}\n\n/**\n * Deeply copy the values of the original, as well as any custom properties.\n */\nexport function copySetStrict<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);\n}\n","import {\n  copyArrayBuffer,\n  copyArrayLoose,\n  copyArrayStrict,\n  copyBlob,\n  copyDataView,\n  copyDate,\n  copyMapLoose,\n  copyMapStrict,\n  copyObjectLoose,\n  copyObjectStrict,\n  copyPrimitiveWrapper,\n  copyRegExp,\n  copySelf,\n  copySetLoose,\n  copySetStrict,\n} from './copier';\nimport { createCache, getTag } from './utils';\n\nimport type { InternalCopier, State } from './copier';\n\nexport type { State } from './copier';\n\nconst { isArray } = Array;\nconst { assign, getPrototypeOf } = Object;\n\nexport interface CreateCopierOptions {\n  array?: InternalCopier<any[]>;\n  arrayBuffer?: InternalCopier<ArrayBuffer>;\n  blob?: InternalCopier<Blob>;\n  dataView?: InternalCopier<DataView>;\n  date?: InternalCopier<Date>;\n  error?: InternalCopier<any>;\n  map?: InternalCopier<Map<any, any>>;\n  object?: InternalCopier<Record<string, any>>;\n  regExp?: InternalCopier<RegExp>;\n  set?: InternalCopier<Set<any>>;\n}\n\nconst DEFAULT_LOOSE_OPTIONS: Required<CreateCopierOptions> = {\n  array: copyArrayLoose,\n  arrayBuffer: copyArrayBuffer,\n  blob: copyBlob,\n  dataView: copyDataView,\n  date: copyDate,\n  error: copySelf,\n  map: copyMapLoose,\n  object: copyObjectLoose,\n  regExp: copyRegExp,\n  set: copySetLoose,\n};\nconst DEFAULT_STRICT_OPTIONS: Required<CreateCopierOptions> = assign(\n  {},\n  DEFAULT_LOOSE_OPTIONS,\n  {\n    array: copyArrayStrict,\n    map: copyMapStrict,\n    object: copyObjectStrict,\n    set: copySetStrict,\n  }\n);\n\n/**\n * Get the copiers used for each specific object tag.\n */\nfunction getTagSpecificCopiers(\n  options: Required<CreateCopierOptions>\n): Record<string, InternalCopier<any>> {\n  return {\n    Arguments: options.object,\n    Array: options.array,\n    ArrayBuffer: options.arrayBuffer,\n    Blob: options.blob,\n    Boolean: copyPrimitiveWrapper,\n    DataView: options.dataView,\n    Date: options.date,\n    Error: options.error,\n    Float32Array: options.arrayBuffer,\n    Float64Array: options.arrayBuffer,\n    Int8Array: options.arrayBuffer,\n    Int16Array: options.arrayBuffer,\n    Int32Array: options.arrayBuffer,\n    Map: options.map,\n    Number: copyPrimitiveWrapper,\n    Object: options.object,\n    Promise: copySelf,\n    RegExp: options.regExp,\n    Set: options.set,\n    String: copyPrimitiveWrapper,\n    WeakMap: copySelf,\n    WeakSet: copySelf,\n    Uint8Array: options.arrayBuffer,\n    Uint8ClampedArray: options.arrayBuffer,\n    Uint16Array: options.arrayBuffer,\n    Uint32Array: options.arrayBuffer,\n    Uint64Array: options.arrayBuffer,\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed.\n */\nexport function createCopier(options: CreateCopierOptions) {\n  const normalizedOptions = assign({}, DEFAULT_LOOSE_OPTIONS, options);\n  const tagSpecificCopiers = getTagSpecificCopiers(normalizedOptions);\n  const { Array: array, Object: object } = tagSpecificCopiers;\n\n  function copier(value: any, state: State): any {\n    state.prototype = state.Constructor = undefined;\n\n    if (!value || typeof value !== 'object') {\n      return value;\n    }\n\n    if (state.cache.has(value)) {\n      return state.cache.get(value);\n    }\n\n    state.prototype = value.__proto__ || getPrototypeOf(value);\n    state.Constructor = state.prototype && state.prototype.constructor;\n\n    // plain objects\n    if (!state.Constructor || state.Constructor === Object) {\n      return object(value, state);\n    }\n\n    // arrays\n    if (isArray(value)) {\n      return array(value, state);\n    }\n\n    const tagSpecificCopier = tagSpecificCopiers[getTag(value)];\n\n    if (tagSpecificCopier) {\n      return tagSpecificCopier(value, state);\n    }\n\n    return typeof value.then === 'function' ? value : object(value, state);\n  }\n\n  return function copy<Value>(value: Value): Value {\n    return copier(value, {\n      Constructor: undefined,\n      cache: createCache(),\n      copier,\n      prototype: undefined,\n    });\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed, defaulting to the\n * same internals as `copyStrict`.\n */\nexport function createStrictCopier(options: CreateCopierOptions) {\n  return createCopier(assign({}, DEFAULT_STRICT_OPTIONS, options));\n}\n\n/**\n * Copy an value deeply as much as possible, where strict recreation of object properties\n * are maintained. 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dist/esm/types/copier.d.ts

 import type { Cache } from './utils';
-export declare type InternalCopier<Value = any> = (value: Value, state: State) => Value;
+export declare type InternalCopier<Value> = (value: Value, state: State) => Value;
 export interface State {
     Constructor: any;
     cache: Cache;
-    copier: InternalCopier;
+    copier: InternalCopier<any>;
     prototype: any;
 }
+/**
+ * Deeply copy the indexed values in the array.
+ */
 export declare function copyArrayLoose(array: any[], state: State): any;
+/**
+ * Deeply copy the indexed values in the array, as well as any custom properties.
+ */
 export declare function copyArrayStrict<Value extends any[]>(array: Value, state: State): Value;
+/**
+ * Copy the contents of the ArrayBuffer.
+ */
 export declare function copyArrayBuffer<Value extends ArrayBuffer>(arrayBuffer: Value, _state: State): Value;
+/**
+ * Create a new Blob with the contents of the original.
+ */
 export declare function copyBlob<Value extends Blob>(blob: Value, _state: State): Value;
+/**
+ * Create a new DataView with the contents of the original.
+ */
 export declare function copyDataView<Value extends DataView>(dataView: Value, state: State): Value;
+/**
+ * Create a new Date based on the time of the original.
+ */
 export declare function copyDate<Value extends Date>(date: Value, state: State): Value;
+/**
+ * Deeply copy the keys and values of the original.
+ */
 export declare function copyMapLoose<Value extends Map<any, any>>(map: Value, state: State): Value;
+/**
+ * Deeply copy the keys and values of the original, as well as any custom properties.
+ */
 export declare function copyMapStrict<Value extends Map<any, any>>(map: Value, state: State): Value;
-declare function copyObjectLooseModern<Value extends {}>(object: Value, state: State): Value;
+declare function copyObjectLooseModern<Value extends Record<string, any>>(object: Value, state: State): Value;
 /**
- * Get a copy of the object based on loose rules, meaning all enumerable keys
- * and symbols are copied, but property descriptors are not considered.
+ * Deeply copy the properties (keys and symbols) and values of the original.
  */
 export declare const copyObjectLoose: typeof copyObjectLooseModern;
 /**
- * Get a copy of the object based on strict rules, meaning all keys and symbols
- * are copied based on the original property descriptors.
+ * Deeply copy the properties (keys and symbols) and values of the original, as well
+ * as any hidden or non-enumerable properties.
  */
-export declare function copyObjectStrict<Value extends {}>(object: Value, state: State): Value;
+export declare function copyObjectStrict<Value extends Record<string, any>>(object: Value, state: State): Value;
+/**
+ * Create a new primitive wrapper from the value of the original.
+ */
+export declare function copyPrimitiveWrapper<Value extends Boolean | Number | String>(primitiveObject: Value, state: State): Value;
+/**
+ * Create a new RegExp based on the value and flags of the original.
+ */
 export declare function copyRegExp<Value extends RegExp>(regExp: Value, state: State): Value;
+/**
+ * Return the original value (an identity function).
+ *
+ * @note
+ * THis is used for objects that cannot be copied, such as WeakMap.
+ */
 export declare function copySelf<Value>(value: Value, _state: State): Value;
+/**
+ * Deeply copy the values of the original.
+ */
 export declare function copySetLoose<Value extends Set<any>>(set: Value, state: State): Value;
+/**
+ * Deeply copy the values of the original, as well as any custom properties.
+ */
 export declare function copySetStrict<Value extends Set<any>>(set: Value, state: State): Value;
 export {};

dist/esm/types/utils.d.ts

 export interface Cache {
-    _keys?: any[];
-    _values?: any[];
     has: (value: any) => boolean;
@@ -22,7 +20,7 @@ set: (key: any, value: any) => void;
 export declare const getRegExpFlags: typeof getRegExpFlagsModern;
-declare function getTagModern(value: any): string;
+declare function getTagLegacy(value: any): string;
 /**
  * Get the tag of the value passed, so that the correct copier can be used.
  */
-export declare const getTag: typeof getTagModern;
+export declare const getTag: typeof getTagLegacy;
 export {};

dist/min/index.js

@@ -1,2 +0,2 @@
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+!function(r,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t((r="undefined"!=typeof globalThis?globalThis:r||self)["fast-copy"]={})}(this,(function(r){"use strict";var t=Function.prototype.toString,e=Object.create,n=Object.prototype.toString,o=function(){function r(){this._keys=[],this._values=[]}return r.prototype.has=function(r){return!!~this._keys.indexOf(r)},r.prototype.get=function(r){return this._values[this._keys.indexOf(r)]},r.prototype.set=function(r,t){this._keys.push(r),this._values.push(t)},r}();var a="undefined"!=typeof WeakMap?function(){return new WeakMap}:function(){return new o};function c(r){if(!r)return e(null);var n=r.constructor;if(n===Object)return r===Object.prototype?{}:e(r);if(~t.call(n).indexOf("[native code]"))try{return new n}catch(r){}return e(r)}var u="g"===/test/g.flags?function(r){return r.flags}:function(r){var t="";return r.global&&(t+="g"),r.ignoreCase&&(t+="i"),r.multiline&&(t+="m"),r.unicode&&(t+="u"),r.sticky&&(t+="y"),t};function i(r){var t=n.call(r);return t.substring(8,t.length-1)}var f="undefined"!=typeof Symbol?function(r){return r[Symbol.toStringTag]||i(r)}:i,s=Object.defineProperty,p=Object.getOwnPropertyDescriptor,y=Object.getOwnPropertyNames,l=Object.getOwnPropertySymbols,v=Object.prototype,d=v.hasOwnProperty,b=v.propertyIsEnumerable,h="function"==typeof l;var g=h?function(r){return y(r).concat(l(r))}:y;function O(r,t,e){for(var n=g(r),o=0,a=n.length,c=void 0,u=void 0;o<a;++o)if("callee"!==(c=n[o])&&"caller"!==c)if(u=p(r,c)){u.get||u.set||(u.value=e.copier(u.value,e));try{s(t,c,u)}catch(r){t[c]=u.value}}else t[c]=e.copier(r[c],e);return t}function j(r,t){return r.slice(0)}function w(r,t){var e=new t.Constructor;return t.cache.set(r,e),r.forEach((function(r,n){e.set(n,t.copier(r,t))})),e}var m=h?function(r,t){var e=c(t.prototype);for(var n in t.cache.set(r,e),r)d.call(r,n)&&(e[n]=t.copier(r[n],t));for(var o=l(r),a=0,u=o.length,i=void 0;a<u;++a)i=o[a],b.call(r,i)&&(e[i]=t.copier(r[i],t));return e}:function(r,t){var e=c(t.prototype);for(var n in t.cache.set(r,e),r)d.call(r,n)&&(e[n]=t.copier(r[n],t));return e};function C(r,t){return new t.Constructor(r.valueOf())}function A(r,t){return r}function B(r,t){var e=new t.Constructor;return t.cache.set(r,e),r.forEach((function(r){e.add(t.copier(r,t))})),e}var _=Array.isArray,x=Object.assign,S=Object.getPrototypeOf,k={array:function(r,t){var e=new t.Constructor;t.cache.set(r,e);for(var n=0,o=r.length;n<o;++n)e[n]=t.copier(r[n],t);return e},arrayBuffer:j,blob:function(r,t){return r.slice(0,r.size,r.type)},dataView:function(r,t){return new t.Constructor(j(r.buffer))},date:function(r,t){return new t.Constructor(r.getTime())},error:A,map:w,object:m,regExp:function(r,t){var e=new t.Constructor(r.source,u(r));return e.lastIndex=r.lastIndex,e},set:B},P=x({},k,{array:function(r,t){var e=new t.Constructor;return t.cache.set(r,e),O(r,e,t)},map:function(r,t){return O(r,w(r,t),t)},object:function(r,t){var e=c(t.prototype);return t.cache.set(r,e),O(r,e,t)},set:function(r,t){return O(r,B(r,t),t)}});function E(r){var t=function(r){return{Arguments:r.object,Array:r.array,ArrayBuffer:r.arrayBuffer,Blob:r.blob,Boolean:C,DataView:r.dataView,Date:r.date,Error:r.error,Float32Array:r.arrayBuffer,Float64Array:r.arrayBuffer,Int8Array:r.arrayBuffer,Int16Array:r.arrayBuffer,Int32Array:r.arrayBuffer,Map:r.map,Number:C,Object:r.object,Promise:A,RegExp:r.regExp,Set:r.set,String:C,WeakMap:A,WeakSet:A,Uint8Array:r.arrayBuffer,Uint8ClampedArray:r.arrayBuffer,Uint16Array:r.arrayBuffer,Uint32Array:r.arrayBuffer,Uint64Array:r.arrayBuffer}}(x({},k,r)),e=t.Array,n=t.Object;function o(r,o){if(o.prototype=o.Constructor=void 0,!r||"object"!=typeof r)return r;if(o.cache.has(r))return o.cache.get(r);if(o.prototype=r.__proto__||S(r),o.Constructor=o.prototype&&o.prototype.constructor,!o.Constructor||o.Constructor===Object)return n(r,o);if(_(r))return e(r,o);var a=t[f(r)];return a?a(r,o):"function"==typeof r.then?r:n(r,o)}return function(r){return o(r,{Constructor:void 0,cache:a(),copier:o,prototype:void 0})}}function I(r){return E(x({},P,r))}var M=I({}),U=E({});r.copyStrict=M,r.createCopier=E,r.createStrictCopier=I,r.default=U,Object.defineProperty(r,"__esModule",{value:!0})}));
 //# sourceMappingURL=index.js.map

dist/min/index.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"index.js","sources":["../../../../src/utils.ts","../../../../src/copier.ts","../../../../src/index.ts"],"sourcesContent":["import type { CreateCopierOptions } from './index';\n\nexport interface Cache {\n  _keys?: any[];\n  _values?: any[];\n  has: (value: any) => boolean;\n  set: (key: any, value: any) => void;\n  get: (key: any) => any;\n}\n\nconst { toString: toStringFunction } = Function.prototype;\nconst { create } = Object;\nconst { toString: toStringObject } = Object.prototype;\n\nclass LegacyCache {\n  _keys: any[] = [];\n  _values: any[] = [];\n\n  has(key: any) {\n    return !!~this._keys.indexOf(key);\n  }\n\n  get(key: any) {\n    return this._values[this._keys.indexOf(key)];\n  }\n\n  set(key: any, value: any) {\n    this._keys.push(key);\n    this._values.push(value);\n  }\n}\n\nfunction createCacheLegacy(): Cache {\n  return new LegacyCache();\n}\n\nfunction createCacheModern(): Cache {\n  return new WeakMap();\n}\n\n/**\n * Get a new cache object to prevent circular references.\n */\nexport const createCache =\n  typeof WeakMap !== 'undefined' ? createCacheModern : createCacheLegacy;\n\n/**\n * Get an empty version of the object with the same prototype it has.\n */\nexport function getCleanClone(prototype: any): any {\n  if (!prototype) {\n    return create(null);\n  }\n\n  const Constructor = prototype.constructor;\n\n  if (Constructor === Object) {\n    return prototype === Object.prototype ? {} : create(prototype);\n  }\n\n  if (~toStringFunction.call(Constructor).indexOf('[native code]')) {\n    try {\n      return new Constructor();\n    } catch {}\n  }\n\n  return create(prototype);\n}\n\nfunction getRegExpFlagsLegacy(regExp: RegExp): string {\n  let flags = '';\n\n  if (regExp.global) {\n    flags += 'g';\n  }\n\n  if (regExp.ignoreCase) {\n    flags += 'i';\n  }\n\n  if (regExp.multiline) {\n    flags += 'm';\n  }\n\n  if (regExp.unicode) {\n    flags += 'u';\n  }\n\n  if (regExp.sticky) {\n    flags += 'y';\n  }\n\n  return flags;\n}\n\nfunction getRegExpFlagsModern(regExp: RegExp): string {\n  return regExp.flags;\n}\n\n/**\n * Get the flags to apply to the copied regexp.\n */\nexport const getRegExpFlags =\n  /test/g.flags === 'g' ? getRegExpFlagsModern : getRegExpFlagsLegacy;\n\nfunction getTagLegacy(value: any): string {\n  const type = toStringObject.call(value);\n\n  return type.substring(8, type.length - 1);\n}\n\nfunction getTagModern(value: any): string {\n  return value[Symbol.toStringTag] || getTagLegacy(value);\n}\n\n/**\n * Get the tag of the value passed, so that the correct copier can be used.\n */\nexport const getTag =\n  typeof Symbol !== 'undefined' ? getTagModern : getTagLegacy;\n","import { getCleanClone, getRegExpFlags } from './utils';\n\nimport type { Cache } from './utils';\n\nexport type InternalCopier<Value = any> = (value: Value, state: State) => Value;\n\nexport interface State {\n  Constructor: any;\n  cache: Cache;\n  copier: InternalCopier;\n  prototype: any;\n}\n\nconst {\n  defineProperty,\n  getOwnPropertyDescriptor,\n  getOwnPropertyNames,\n  getOwnPropertySymbols,\n} = Object;\nconst { hasOwnProperty, propertyIsEnumerable } = Object.prototype;\n\nconst SUPPORTS_SYMBOL = typeof getOwnPropertySymbols === 'function';\n\nfunction getStrictPropertiesModern(object: any): Array<string | symbol> {\n  return (getOwnPropertyNames(object) as Array<string | symbol>).concat(\n    getOwnPropertySymbols(object)\n  );\n}\n\nconst getStrictProperties = SUPPORTS_SYMBOL\n  ? getStrictPropertiesModern\n  : getOwnPropertyNames;\n\nfunction copyOwnPropertiesStrict<Value extends any>(\n  value: Value,\n  clone: Value,\n  state: State\n): Value {\n  const properties = getStrictProperties(value);\n  const { copier } = state;\n\n  for (\n    let index = 0, length = properties.length, property, descriptor;\n    index < length;\n    ++index\n  ) {\n    property = properties[index];\n\n    if (property === 'callee' || property === 'caller') {\n      continue;\n    }\n\n    descriptor = getOwnPropertyDescriptor(value, property);\n\n    if (!descriptor) {\n      // In extra edge cases where the property descriptor cannot be retrived, fall back to\n      // the loose assignment.\n      (clone as any)[property] = copier((value as any)[property], state);\n      continue;\n    }\n\n    // Only clone the value if actually a value, not a getter / setter.\n    if (!descriptor.get && !descriptor.set) {\n      descriptor.value = copier(descriptor.value, state);\n    }\n\n    try {\n      defineProperty(clone, property, descriptor);\n    } catch (error) {\n      // Tee above can fail on node in edge cases, so fall back to the loose assignment.\n      (clone as any)[property] = descriptor.value;\n    }\n  }\n\n  return clone;\n}\n\nexport function copyArrayLoose(array: any[], state: State) {\n  const clone = new state.Constructor();\n  const { cache, copier } = state;\n\n  cache.set(array, clone);\n\n  for (let index: number = 0, length = array.length; index < length; ++index) {\n    clone[index] = copier(array[index], state);\n  }\n\n  return clone;\n}\n\nexport function copyArrayStrict<Value extends any[]>(\n  array: Value,\n  state: State\n) {\n  const clone = new state.Constructor() as Value;\n\n  state.cache.set(array, clone);\n\n  return copyOwnPropertiesStrict(array, clone, state);\n}\n\nexport function copyArrayBuffer<Value extends ArrayBuffer>(\n  arrayBuffer: Value,\n  _state: State\n): Value {\n  return arrayBuffer.slice(0) as Value;\n}\n\nexport function copyBlob<Value extends Blob>(\n  blob: Value,\n  _state: State\n): Value {\n  return blob.slice(0, blob.size, blob.type) as Value;\n}\n\nexport function copyDataView<Value extends DataView>(\n  dataView: Value,\n  state: State\n): Value {\n  return new state.Constructor(copyArrayBuffer(dataView.buffer, state));\n}\n\nexport function copyDate<Value extends Date>(date: Value, state: State): Value {\n  return new state.Constructor(date.getTime());\n}\n\nexport function copyMapLoose<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n  const { cache, copier } = state;\n\n  cache.set(map, clone);\n\n  map.forEach((value, key) => {\n    clone.set(key, copier(value, state));\n  });\n\n  return clone;\n}\n\nexport function copyMapStrict<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n) {\n  return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);\n}\n\nfunction copyObjectLooseLegacy<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n  const { cache, copier } = state;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = copier(object[key], state);\n    }\n  }\n\n  return clone;\n}\n\nfunction copyObjectLooseModern<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n  const { cache, copier } = state;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = copier(object[key], state);\n    }\n  }\n\n  const symbols: symbol[] = getOwnPropertySymbols(object);\n\n  for (\n    let index = 0, length = symbols.length, symbol;\n    index < length;\n    ++index\n  ) {\n    symbol = symbols[index];\n\n    if (propertyIsEnumerable.call(object, symbol)) {\n      clone[symbol] = copier((object as any)[symbol], state);\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Get a copy of the object based on loose rules, meaning all enumerable keys\n * and symbols are copied, but property descriptors are not considered.\n */\nexport const copyObjectLoose = SUPPORTS_SYMBOL\n  ? copyObjectLooseModern\n  : copyObjectLooseLegacy;\n\n/**\n * Get a copy of the object based on strict rules, meaning all keys and symbols\n * are copied based on the original property descriptors.\n */\nexport function copyObjectStrict<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  return copyOwnPropertiesStrict(object, clone, state);\n}\n\nexport function copyRegExp<Value extends RegExp>(\n  regExp: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor(\n    regExp.source,\n    getRegExpFlags(regExp)\n  ) as Value;\n\n  clone.lastIndex = regExp.lastIndex;\n\n  return clone;\n}\n\nexport function copySelf<Value>(value: Value, _state: State): Value {\n  return value;\n}\n\nexport function copySetLoose<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n  const { cache, copier } = state;\n\n  cache.set(set, clone);\n\n  set.forEach((value) => {\n    clone.add(copier(value, state));\n  });\n\n  return clone;\n}\n\nexport function copySetStrict<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);\n}\n","import {\n  copyArrayBuffer,\n  copyArrayLoose,\n  copyArrayStrict,\n  copyBlob,\n  copyDataView,\n  copyDate,\n  copyMapLoose,\n  copyMapStrict,\n  copyObjectLoose,\n  copyObjectStrict,\n  copyRegExp,\n  copySelf,\n  copySetLoose,\n  copySetStrict,\n} from './copier';\nimport { createCache, getTag } from './utils';\n\nimport type { InternalCopier, State } from './copier';\n\nexport type { State } from './copier';\n\nconst { isArray } = Array;\nconst { getPrototypeOf } = Object;\n\nexport interface CreateCopierOptions {\n  array?: InternalCopier<any[]>;\n  arrayBuffer?: InternalCopier<ArrayBuffer>;\n  blob?: InternalCopier<Blob>;\n  dataView?: InternalCopier<DataView>;\n  date?: InternalCopier<Date>;\n  error?: InternalCopier<any>;\n  map?: InternalCopier<Map<any, any>>;\n  object?: InternalCopier<Record<string, any>>;\n  regExp?: InternalCopier<RegExp>;\n  set?: InternalCopier<Set<any>>;\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed.\n */\nexport function createCopier(options: CreateCopierOptions) {\n  const {\n    array = copyArrayLoose,\n    arrayBuffer = copyArrayBuffer,\n    blob = copyBlob,\n    dataView = copyDataView,\n    date = copyDate,\n    error = copySelf,\n    map = copyMapLoose,\n    object = copyObjectLoose,\n    regExp = copyRegExp,\n    set = copySetLoose,\n  } = options;\n\n  const tagSpecificCopiers: Record<string, InternalCopier> = {\n    Array: array,\n    ArrayBuffer: arrayBuffer,\n    Blob: blob,\n    DataView: dataView,\n    Date: date,\n    Error: error,\n    Float32Array: arrayBuffer,\n    Float64Array: arrayBuffer,\n    Int8Array: arrayBuffer,\n    Int16Array: arrayBuffer,\n    Int32Array: arrayBuffer,\n    Map: map,\n    Object: object,\n    Promise: copySelf,\n    RegExp: regExp,\n    Set: set,\n    WeakMap: copySelf,\n    WeakSet: copySelf,\n    Uint8Array: arrayBuffer,\n    Uint8ClampedArray: arrayBuffer,\n    Uint16Array: arrayBuffer,\n    Uint32Array: arrayBuffer,\n    Uint64Array: arrayBuffer,\n  };\n\n  function copier(value: any, state: State): any {\n    state.prototype = state.Constructor = undefined;\n\n    if (!value || typeof value !== 'object') {\n      return value;\n    }\n\n    if (state.cache.has(value)) {\n      return state.cache.get(value);\n    }\n\n    state.prototype = value.__proto__ || getPrototypeOf(value);\n    state.Constructor = state.prototype && state.prototype.constructor;\n\n    // plain objects\n    if (!state.Constructor || state.Constructor === Object) {\n      return object(value, state);\n    }\n\n    // arrays\n    if (isArray(value)) {\n      return array(value, state);\n    }\n\n    const tagSpecificCopier = tagSpecificCopiers[getTag(value)];\n\n    if (tagSpecificCopier) {\n      return tagSpecificCopier(value, state);\n    }\n\n    return typeof value.then === 'function' ? value : object(value, state);\n  }\n\n  return function copy<Value>(value: Value): Value {\n    return copier(value, {\n      Constructor: undefined,\n      cache: createCache(),\n      copier,\n      prototype: undefined,\n    });\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed, defaulting to the\n * same internals as `copyStrict`.\n */\nexport function createStrictCopier(options: CreateCopierOptions) {\n  return createCopier(\n    Object.assign(\n      {\n        array: copyArrayStrict,\n        map: copyMapStrict,\n        object: copyObjectStrict,\n        set: copySetStrict,\n      },\n      options\n    )\n  );\n}\n\n/**\n * Copy an value deeply as much as possible, where strict recreation of object properties\n * are maintained. All properties (including non-enumerable ones) are copied with their\n * original property descriptors on both objects and arrays.\n */\nexport const copyStrict = createStrictCopier({});\n\n/**\n * Copy an value deeply as much as possible.\n */\nexport default 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+{"version":3,"file":"index.js","sources":["../../../../src/utils.ts","../../../../src/copier.ts","../../../../src/index.ts"],"sourcesContent":["export interface Cache {\n  has: (value: any) => boolean;\n  set: (key: any, value: any) => void;\n  get: (key: any) => any;\n}\n\nconst { toString: toStringFunction } = Function.prototype;\nconst { create } = Object;\nconst { toString: toStringObject } = Object.prototype;\n\n/**\n * @classdesc Fallback cache for when WeakMap is not natively supported\n */\nclass LegacyCache {\n  private _keys: any[] = [];\n  private _values: any[] = [];\n\n  has(key: any) {\n    return !!~this._keys.indexOf(key);\n  }\n\n  get(key: any) {\n    return this._values[this._keys.indexOf(key)];\n  }\n\n  set(key: any, value: any) {\n    this._keys.push(key);\n    this._values.push(value);\n  }\n}\n\nfunction createCacheLegacy(): Cache {\n  return new LegacyCache();\n}\n\nfunction createCacheModern(): Cache {\n  return new WeakMap();\n}\n\n/**\n * Get a new cache object to prevent circular references.\n */\nexport const createCache =\n  typeof WeakMap !== 'undefined' ? createCacheModern : createCacheLegacy;\n\n/**\n * Get an empty version of the object with the same prototype it has.\n */\nexport function getCleanClone(prototype: any): any {\n  if (!prototype) {\n    return create(null);\n  }\n\n  const Constructor = prototype.constructor;\n\n  if (Constructor === Object) {\n    return prototype === Object.prototype ? {} : create(prototype);\n  }\n\n  if (~toStringFunction.call(Constructor).indexOf('[native code]')) {\n    try {\n      return new Constructor();\n    } catch {}\n  }\n\n  return create(prototype);\n}\n\nfunction getRegExpFlagsLegacy(regExp: RegExp): string {\n  let flags = '';\n\n  if (regExp.global) {\n    flags += 'g';\n  }\n\n  if (regExp.ignoreCase) {\n    flags += 'i';\n  }\n\n  if (regExp.multiline) {\n    flags += 'm';\n  }\n\n  if (regExp.unicode) {\n    flags += 'u';\n  }\n\n  if (regExp.sticky) {\n    flags += 'y';\n  }\n\n  return flags;\n}\n\nfunction getRegExpFlagsModern(regExp: RegExp): string {\n  return regExp.flags;\n}\n\n/**\n * Get the flags to apply to the copied regexp.\n */\nexport const getRegExpFlags =\n  /test/g.flags === 'g' ? getRegExpFlagsModern : getRegExpFlagsLegacy;\n\nfunction getTagLegacy(value: any): string {\n  const type = toStringObject.call(value);\n\n  return type.substring(8, type.length - 1);\n}\n\nfunction getTagModern(value: any): string {\n  return value[Symbol.toStringTag] || getTagLegacy(value);\n}\n\n/**\n * Get the tag of the value passed, so that the correct copier can be used.\n */\nexport const getTag =\n  typeof Symbol !== 'undefined' ? getTagModern : getTagLegacy;\n","import { getCleanClone, getRegExpFlags } from './utils';\n\nimport type { Cache } from './utils';\n\nexport type InternalCopier<Value> = (value: Value, state: State) => Value;\n\nexport interface State {\n  Constructor: any;\n  cache: Cache;\n  copier: InternalCopier<any>;\n  prototype: any;\n}\n\nconst {\n  defineProperty,\n  getOwnPropertyDescriptor,\n  getOwnPropertyNames,\n  getOwnPropertySymbols,\n} = Object;\nconst { hasOwnProperty, propertyIsEnumerable } = Object.prototype;\n\nconst SUPPORTS_SYMBOL = typeof getOwnPropertySymbols === 'function';\n\nfunction getStrictPropertiesModern(object: any): Array<string | symbol> {\n  return (getOwnPropertyNames(object) as Array<string | symbol>).concat(\n    getOwnPropertySymbols(object)\n  );\n}\n\n/**\n * Get the properites used when copying objects strictly. This includes both keys and symbols.\n */\nconst getStrictProperties = SUPPORTS_SYMBOL\n  ? getStrictPropertiesModern\n  : getOwnPropertyNames;\n\n/**\n * Striclty copy all properties contained on the object.\n */\nfunction copyOwnPropertiesStrict<Value>(\n  value: Value,\n  clone: Value,\n  state: State\n): Value {\n  const properties = getStrictProperties(value);\n\n  for (\n    let index = 0, length = properties.length, property, descriptor;\n    index < length;\n    ++index\n  ) {\n    property = properties[index];\n\n    if (property === 'callee' || property === 'caller') {\n      continue;\n    }\n\n    descriptor = getOwnPropertyDescriptor(value, property);\n\n    if (!descriptor) {\n      // In extra edge cases where the property descriptor cannot be retrived, fall back to\n      // the loose assignment.\n      (clone as any)[property] = state.copier((value as any)[property], state);\n      continue;\n    }\n\n    // Only clone the value if actually a value, not a getter / setter.\n    if (!descriptor.get && !descriptor.set) {\n      descriptor.value = state.copier(descriptor.value, state);\n    }\n\n    try {\n      defineProperty(clone, property, descriptor);\n    } catch (error) {\n      // Tee above can fail on node in edge cases, so fall back to the loose assignment.\n      (clone as any)[property] = descriptor.value;\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the indexed values in the array.\n */\nexport function copyArrayLoose(array: any[], state: State) {\n  const clone = new state.Constructor();\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(array, clone);\n\n  for (let index = 0, length = array.length; index < length; ++index) {\n    clone[index] = state.copier(array[index], state);\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the indexed values in the array, as well as any custom properties.\n */\nexport function copyArrayStrict<Value extends any[]>(\n  array: Value,\n  state: State\n) {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(array, clone);\n\n  return copyOwnPropertiesStrict(array, clone, state);\n}\n\n/**\n * Copy the contents of the ArrayBuffer.\n */\nexport function copyArrayBuffer<Value extends ArrayBuffer>(\n  arrayBuffer: Value,\n  _state: State\n): Value {\n  return arrayBuffer.slice(0) as Value;\n}\n\n/**\n * Create a new Blob with the contents of the original.\n */\nexport function copyBlob<Value extends Blob>(\n  blob: Value,\n  _state: State\n): Value {\n  return blob.slice(0, blob.size, blob.type) as Value;\n}\n\n/**\n * Create a new DataView with the contents of the original.\n */\nexport function copyDataView<Value extends DataView>(\n  dataView: Value,\n  state: State\n): Value {\n  return new state.Constructor(copyArrayBuffer(dataView.buffer, state));\n}\n\n/**\n * Create a new Date based on the time of the original.\n */\nexport function copyDate<Value extends Date>(date: Value, state: State): Value {\n  return new state.Constructor(date.getTime());\n}\n\n/**\n * Deeply copy the keys and values of the original.\n */\nexport function copyMapLoose<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(map, clone);\n\n  map.forEach((value, key) => {\n    clone.set(key, state.copier(value, state));\n  });\n\n  return clone;\n}\n\n/**\n * Deeply copy the keys and values of the original, as well as any custom properties.\n */\nexport function copyMapStrict<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n) {\n  return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);\n}\n\nfunction copyObjectLooseLegacy<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = state.copier(object[key], state);\n    }\n  }\n\n  return clone;\n}\n\nfunction copyObjectLooseModern<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = state.copier(object[key], state);\n    }\n  }\n\n  const symbols = getOwnPropertySymbols(object);\n\n  for (\n    let index = 0, length = symbols.length, symbol;\n    index < length;\n    ++index\n  ) {\n    symbol = symbols[index];\n\n    if (propertyIsEnumerable.call(object, symbol)) {\n      clone[symbol] = state.copier((object as any)[symbol], state);\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the properties (keys and symbols) and values of the original.\n */\nexport const copyObjectLoose = SUPPORTS_SYMBOL\n  ? copyObjectLooseModern\n  : copyObjectLooseLegacy;\n\n/**\n * Deeply copy the properties (keys and symbols) and values of the original, as well\n * as any hidden or non-enumerable properties.\n */\nexport function copyObjectStrict<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  return copyOwnPropertiesStrict(object, clone, state);\n}\n\n/**\n * Create a new primitive wrapper from the value of the original.\n */\nexport function copyPrimitiveWrapper<\n  // Specifically use the object constructor types\n  // eslint-disable-next-line @typescript-eslint/ban-types\n  Value extends Boolean | Number | String\n>(primitiveObject: Value, state: State): Value {\n  return new state.Constructor(primitiveObject.valueOf());\n}\n\n/**\n * Create a new RegExp based on the value and flags of the original.\n */\nexport function copyRegExp<Value extends RegExp>(\n  regExp: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor(\n    regExp.source,\n    getRegExpFlags(regExp)\n  ) as Value;\n\n  clone.lastIndex = regExp.lastIndex;\n\n  return clone;\n}\n\n/**\n * Return the original value (an identity function).\n *\n * @note\n * THis is used for objects that cannot be copied, such as WeakMap.\n */\nexport function copySelf<Value>(value: Value, _state: State): Value {\n  return value;\n}\n\n/**\n * Deeply copy the values of the original.\n */\nexport function copySetLoose<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(set, clone);\n\n  set.forEach((value) => {\n    clone.add(state.copier(value, state));\n  });\n\n  return clone;\n}\n\n/**\n * Deeply copy the values of the original, as well as any custom properties.\n */\nexport function copySetStrict<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);\n}\n","import {\n  copyArrayBuffer,\n  copyArrayLoose,\n  copyArrayStrict,\n  copyBlob,\n  copyDataView,\n  copyDate,\n  copyMapLoose,\n  copyMapStrict,\n  copyObjectLoose,\n  copyObjectStrict,\n  copyPrimitiveWrapper,\n  copyRegExp,\n  copySelf,\n  copySetLoose,\n  copySetStrict,\n} from './copier';\nimport { createCache, getTag } from './utils';\n\nimport type { InternalCopier, State } from './copier';\n\nexport type { State } from './copier';\n\nconst { isArray } = Array;\nconst { assign, getPrototypeOf } = Object;\n\nexport interface CreateCopierOptions {\n  array?: InternalCopier<any[]>;\n  arrayBuffer?: InternalCopier<ArrayBuffer>;\n  blob?: InternalCopier<Blob>;\n  dataView?: InternalCopier<DataView>;\n  date?: InternalCopier<Date>;\n  error?: InternalCopier<any>;\n  map?: InternalCopier<Map<any, any>>;\n  object?: InternalCopier<Record<string, any>>;\n  regExp?: InternalCopier<RegExp>;\n  set?: InternalCopier<Set<any>>;\n}\n\nconst DEFAULT_LOOSE_OPTIONS: Required<CreateCopierOptions> = {\n  array: copyArrayLoose,\n  arrayBuffer: copyArrayBuffer,\n  blob: copyBlob,\n  dataView: copyDataView,\n  date: copyDate,\n  error: copySelf,\n  map: copyMapLoose,\n  object: copyObjectLoose,\n  regExp: copyRegExp,\n  set: copySetLoose,\n};\nconst DEFAULT_STRICT_OPTIONS: Required<CreateCopierOptions> = assign(\n  {},\n  DEFAULT_LOOSE_OPTIONS,\n  {\n    array: copyArrayStrict,\n    map: copyMapStrict,\n    object: copyObjectStrict,\n    set: copySetStrict,\n  }\n);\n\n/**\n * Get the copiers used for each specific object tag.\n */\nfunction getTagSpecificCopiers(\n  options: Required<CreateCopierOptions>\n): Record<string, InternalCopier<any>> {\n  return {\n    Arguments: options.object,\n    Array: options.array,\n    ArrayBuffer: options.arrayBuffer,\n    Blob: options.blob,\n    Boolean: copyPrimitiveWrapper,\n    DataView: options.dataView,\n    Date: options.date,\n    Error: options.error,\n    Float32Array: options.arrayBuffer,\n    Float64Array: options.arrayBuffer,\n    Int8Array: options.arrayBuffer,\n    Int16Array: options.arrayBuffer,\n    Int32Array: options.arrayBuffer,\n    Map: options.map,\n    Number: copyPrimitiveWrapper,\n    Object: options.object,\n    Promise: copySelf,\n    RegExp: options.regExp,\n    Set: options.set,\n    String: copyPrimitiveWrapper,\n    WeakMap: copySelf,\n    WeakSet: copySelf,\n    Uint8Array: options.arrayBuffer,\n    Uint8ClampedArray: options.arrayBuffer,\n    Uint16Array: options.arrayBuffer,\n    Uint32Array: options.arrayBuffer,\n    Uint64Array: options.arrayBuffer,\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed.\n */\nexport function createCopier(options: CreateCopierOptions) {\n  const normalizedOptions = assign({}, DEFAULT_LOOSE_OPTIONS, options);\n  const tagSpecificCopiers = getTagSpecificCopiers(normalizedOptions);\n  const { Array: array, Object: object } = tagSpecificCopiers;\n\n  function copier(value: any, state: State): any {\n    state.prototype = state.Constructor = undefined;\n\n    if (!value || typeof value !== 'object') {\n      return value;\n    }\n\n    if (state.cache.has(value)) {\n      return state.cache.get(value);\n    }\n\n    state.prototype = value.__proto__ || getPrototypeOf(value);\n    state.Constructor = state.prototype && state.prototype.constructor;\n\n    // plain objects\n    if (!state.Constructor || state.Constructor === Object) {\n      return object(value, state);\n    }\n\n    // arrays\n    if (isArray(value)) {\n      return array(value, state);\n    }\n\n    const tagSpecificCopier = tagSpecificCopiers[getTag(value)];\n\n    if (tagSpecificCopier) {\n      return tagSpecificCopier(value, state);\n    }\n\n    return typeof value.then === 'function' ? value : object(value, state);\n  }\n\n  return function copy<Value>(value: Value): Value {\n    return copier(value, {\n      Constructor: undefined,\n      cache: createCache(),\n      copier,\n      prototype: undefined,\n    });\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed, defaulting to the\n * same internals as `copyStrict`.\n */\nexport function createStrictCopier(options: CreateCopierOptions) {\n  return createCopier(assign({}, DEFAULT_STRICT_OPTIONS, options));\n}\n\n/**\n * Copy an value deeply as much as possible, where strict recreation of object properties\n * are maintained. All properties (including non-enumerable ones) are copied with their\n * original property descriptors on both objects and arrays.\n */\nexport const copyStrict = createStrictCopier({});\n\n/**\n * Copy an value deeply as much as possible.\n */\nexport default createCopier({});\n"],"names":["toStringFunction","Function","prototype","create","Object","toStringObject","LegacyCache","this","_keys","_values","has","key","indexOf","get","set","value","push","createCache","WeakMap","getCleanClone","Constructor","constructor","call","_a","getRegExpFlags","flags","regExp","global","ignoreCase","multiline","unicode","sticky","getTagLegacy","type","substring","length","getTag","Symbol","toStringTag","defineProperty","getOwnPropertyDescriptor","getOwnPropertyNames","getOwnPropertySymbols","hasOwnProperty","propertyIsEnumerable","SUPPORTS_SYMBOL","getStrictProperties","object","concat","copyOwnPropertiesStrict","clone","state","properties","index","length_1","property","descriptor","copier","error","copyArrayBuffer","arrayBuffer","_state","slice","copyMapLoose","map","cache","forEach","copyObjectLoose","symbols","length_3","symbol","copyPrimitiveWrapper","primitiveObject","valueOf","copySelf","copySetLoose","add","isArray","Array","assign","getPrototypeOf","DEFAULT_LOOSE_OPTIONS","array","length_2","blob","size","dataView","buffer","date","getTime","source","lastIndex","DEFAULT_STRICT_OPTIONS","createCopier","options","tagSpecificCopiers","Arguments","ArrayBuffer","Blob","Boolean","DataView","Date","Error","Float32Array","Float64Array","Int8Array","Int16Array","Int32Array","Map","Number","Promise","RegExp","Set","String","WeakSet","Uint8Array","Uint8ClampedArray","Uint16Array","Uint32Array","Uint64Array","getTagSpecificCopiers","undefined","__proto__","tagSpecificCopier","then","createStrictCopier","copyStrict"],"mappings":"oPAMQ,IAAUA,EAAqBC,SAASC,mBACxCC,EAAWC,OAAMD,OACPE,EAAmBD,OAAOF,mBAK5CI,EAAA,WAAA,SAAAA,IACUC,KAAKC,MAAU,GACfD,KAAOE,QAAU,EAc1B,CAAD,OAZEH,EAAGJ,UAAAQ,IAAH,SAAIC,GACF,SAAUJ,KAAKC,MAAMI,QAAQD,IAG/BL,EAAGJ,UAAAW,IAAH,SAAIF,GACF,OAAOJ,KAAKE,QAAQF,KAAKC,MAAMI,QAAQD,KAGzCL,EAAAJ,UAAAY,IAAA,SAAIH,EAAUI,GACZR,KAAKC,MAAMQ,KAAKL,GAChBJ,KAAKE,QAAQO,KAAKD,IAErBT,CAAD,IAaO,IAAMW,EACQ,oBAAZC,QART,WACE,OAAO,IAAIA,OACb,EANA,WACE,OAAO,IAAIZ,CACb,EAeM,SAAUa,EAAcjB,GAC5B,IAAKA,EACH,OAAOC,EAAO,MAGhB,IAAMiB,EAAclB,EAAUmB,YAE9B,GAAID,IAAgBhB,OAClB,OAAOF,IAAcE,OAAOF,UAAY,CAAA,EAAKC,EAAOD,GAGtD,IAAKF,EAAiBsB,KAAKF,GAAaR,QAAQ,iBAC9C,IACE,OAAO,IAAIQ,CACH,CAAR,MAAAG,GAAQ,CAGZ,OAAOpB,EAAOD,EAChB,CAmCO,IAAMsB,EACO,MAAlB,QAAQC,MARV,SAA8BC,GAC5B,OAAOA,EAAOD,KAChB,EA5BA,SAA8BC,GAC5B,IAAID,EAAQ,GAsBZ,OApBIC,EAAOC,SACTF,GAAS,KAGPC,EAAOE,aACTH,GAAS,KAGPC,EAAOG,YACTJ,GAAS,KAGPC,EAAOI,UACTL,GAAS,KAGPC,EAAOK,SACTN,GAAS,KAGJA,CACT,EAYA,SAASO,EAAajB,GACpB,IAAMkB,EAAO5B,EAAeiB,KAAKP,GAEjC,OAAOkB,EAAKC,UAAU,EAAGD,EAAKE,OAAS,EACzC,CASO,IAAMC,EACO,oBAAXC,OART,SAAsBtB,GACpB,OAAOA,EAAMsB,OAAOC,cAAgBN,EAAajB,EACnD,EAMiDiB,ECxG/CO,EAIEnC,sBAHFoC,EAGEpC,OAAMoC,yBAFRC,EAEErC,OAFiBqC,oBACnBC,EACEtC,6BACEmB,EAA2CnB,OAAOF,UAAhDyC,EAAcpB,EAAAoB,eAAEC,EAAoBrB,EAAAqB,qBAEtCC,EAAmD,mBAA1BH,EAW/B,IAAMI,EAAsBD,EAT5B,SAAmCE,GACjC,OAAQN,EAAoBM,GAAmCC,OAC7DN,EAAsBK,GAE1B,EAOIN,EAKJ,SAASQ,EACPlC,EACAmC,EACAC,GAIA,IAFA,IAAMC,EAAaN,EAAoB/B,GAGjCsC,EAAQ,EAAGC,EAASF,EAAWjB,OAAQoB,OAAQ,EAAEC,OAAU,EAC/DH,EAAQC,IACND,EAIF,GAAiB,YAFjBE,EAAWH,EAAWC,KAEoB,WAAbE,EAM7B,GAFAC,EAAahB,EAAyBzB,EAAOwC,GAE7C,CAQKC,EAAW3C,KAAQ2C,EAAW1C,MACjC0C,EAAWzC,MAAQoC,EAAMM,OAAOD,EAAWzC,MAAOoC,IAGpD,IACEZ,EAAeW,EAAOK,EAAUC,EAIjC,CAHC,MAAOE,GAENR,EAAcK,GAAYC,EAAWzC,KACvC,CAZA,MAFEmC,EAAcK,GAAYJ,EAAMM,OAAQ1C,EAAcwC,GAAWJ,GAiBtE,OAAOD,CACT,CAoCgB,SAAAS,EACdC,EACAC,GAEA,OAAOD,EAAYE,MAAM,EAC3B,CAgCgB,SAAAC,EACdC,EACAb,GAEA,IAAMD,EAAQ,IAAIC,EAAM/B,YASxB,OANA+B,EAAMc,MAAMnD,IAAIkD,EAAKd,GAErBc,EAAIE,SAAQ,SAACnD,EAAOJ,GAClBuC,EAAMpC,IAAIH,EAAKwC,EAAMM,OAAO1C,EAAOoC,GACrC,IAEOD,CACT,CAiEO,IAAMiB,EAAkBtB,EAnC/B,SACEE,EACAI,GAEA,IAAMD,EAAQ/B,EAAcgC,EAAMjD,WAKlC,IAAK,IAAMS,KAFXwC,EAAMc,MAAMnD,IAAIiC,EAAQG,GAENH,EACZJ,EAAerB,KAAKyB,EAAQpC,KAC9BuC,EAAMvC,GAAOwC,EAAMM,OAAOV,EAAOpC,GAAMwC,IAM3C,IAFA,IAAMiB,EAAU1B,EAAsBK,GAGhCM,EAAQ,EAAGgB,EAASD,EAAQjC,OAAQmC,OAAM,EAC9CjB,EAAQgB,IACNhB,EAEFiB,EAASF,EAAQf,GAEbT,EAAqBtB,KAAKyB,EAAQuB,KACpCpB,EAAMoB,GAAUnB,EAAMM,OAAQV,EAAeuB,GAASnB,IAI1D,OAAOD,CACT,EAhDA,SACEH,EACAI,GAEA,IAAMD,EAAa/B,EAAcgC,EAAMjD,WAKvC,IAAK,IAAMS,KAFXwC,EAAMc,MAAMnD,IAAIiC,EAAQG,GAENH,EACZJ,EAAerB,KAAKyB,EAAQpC,KAC9BuC,EAAMvC,GAAOwC,EAAMM,OAAOV,EAAOpC,GAAMwC,IAI3C,OAAOD,CACT,EA4DgB,SAAAqB,EAIdC,EAAwBrB,GACxB,OAAO,IAAIA,EAAM/B,YAAYoD,EAAgBC,UAC/C,CAyBgB,SAAAC,EAAgB3D,EAAc8C,GAC5C,OAAO9C,CACT,CAKgB,SAAA4D,EACd7D,EACAqC,GAEA,IAAMD,EAAQ,IAAIC,EAAM/B,YASxB,OANA+B,EAAMc,MAAMnD,IAAIA,EAAKoC,GAErBpC,EAAIoD,SAAQ,SAACnD,GACXmC,EAAM0B,IAAIzB,EAAMM,OAAO1C,EAAOoC,GAChC,IAEOD,CACT,CC5RQ,IAAA2B,EAAYC,MAAKD,QACjBE,EAA2B3E,OAAM2E,OAAzBC,EAAmB5E,OAAM4E,eAenCC,EAAuD,CAC3DC,MD6Cc,SAAeA,EAAc/B,GAC3C,IAAMD,EAAQ,IAAIC,EAAM/B,YAGxB+B,EAAMc,MAAMnD,IAAIoE,EAAOhC,GAEvB,IAAK,IAAIG,EAAQ,EAAG8B,EAASD,EAAM/C,OAAQkB,EAAQ8B,IAAU9B,EAC3DH,EAAMG,GAASF,EAAMM,OAAOyB,EAAM7B,GAAQF,GAG5C,OAAOD,CACT,ECvDEU,YAAaD,EACbyB,KDoFc,SACdA,EACAvB,GAEA,OAAOuB,EAAKtB,MAAM,EAAGsB,EAAKC,KAAMD,EAAKnD,KACvC,ECxFEqD,SD6Fc,SACdA,EACAnC,GAEA,OAAO,IAAIA,EAAM/B,YAAYuC,EAAgB2B,EAASC,QACxD,ECjGEC,KDsGc,SAA6BA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dist/min/types/copier.d.ts

 import type { Cache } from './utils';
-export declare type InternalCopier<Value = any> = (value: Value, state: State) => Value;
+export declare type InternalCopier<Value> = (value: Value, state: State) => Value;
 export interface State {
     Constructor: any;
     cache: Cache;
-    copier: InternalCopier;
+    copier: InternalCopier<any>;
     prototype: any;
 }
+/**
+ * Deeply copy the indexed values in the array.
+ */
 export declare function copyArrayLoose(array: any[], state: State): any;
+/**
+ * Deeply copy the indexed values in the array, as well as any custom properties.
+ */
 export declare function copyArrayStrict<Value extends any[]>(array: Value, state: State): Value;
+/**
+ * Copy the contents of the ArrayBuffer.
+ */
 export declare function copyArrayBuffer<Value extends ArrayBuffer>(arrayBuffer: Value, _state: State): Value;
+/**
+ * Create a new Blob with the contents of the original.
+ */
 export declare function copyBlob<Value extends Blob>(blob: Value, _state: State): Value;
+/**
+ * Create a new DataView with the contents of the original.
+ */
 export declare function copyDataView<Value extends DataView>(dataView: Value, state: State): Value;
+/**
+ * Create a new Date based on the time of the original.
+ */
 export declare function copyDate<Value extends Date>(date: Value, state: State): Value;
+/**
+ * Deeply copy the keys and values of the original.
+ */
 export declare function copyMapLoose<Value extends Map<any, any>>(map: Value, state: State): Value;
+/**
+ * Deeply copy the keys and values of the original, as well as any custom properties.
+ */
 export declare function copyMapStrict<Value extends Map<any, any>>(map: Value, state: State): Value;
-declare function copyObjectLooseModern<Value extends {}>(object: Value, state: State): Value;
+declare function copyObjectLooseModern<Value extends Record<string, any>>(object: Value, state: State): Value;
 /**
- * Get a copy of the object based on loose rules, meaning all enumerable keys
- * and symbols are copied, but property descriptors are not considered.
+ * Deeply copy the properties (keys and symbols) and values of the original.
  */
 export declare const copyObjectLoose: typeof copyObjectLooseModern;
 /**
- * Get a copy of the object based on strict rules, meaning all keys and symbols
- * are copied based on the original property descriptors.
+ * Deeply copy the properties (keys and symbols) and values of the original, as well
+ * as any hidden or non-enumerable properties.
  */
-export declare function copyObjectStrict<Value extends {}>(object: Value, state: State): Value;
+export declare function copyObjectStrict<Value extends Record<string, any>>(object: Value, state: State): Value;
+/**
+ * Create a new primitive wrapper from the value of the original.
+ */
+export declare function copyPrimitiveWrapper<Value extends Boolean | Number | String>(primitiveObject: Value, state: State): Value;
+/**
+ * Create a new RegExp based on the value and flags of the original.
+ */
 export declare function copyRegExp<Value extends RegExp>(regExp: Value, state: State): Value;
+/**
+ * Return the original value (an identity function).
+ *
+ * @note
+ * THis is used for objects that cannot be copied, such as WeakMap.
+ */
 export declare function copySelf<Value>(value: Value, _state: State): Value;
+/**
+ * Deeply copy the values of the original.
+ */
 export declare function copySetLoose<Value extends Set<any>>(set: Value, state: State): Value;
+/**
+ * Deeply copy the values of the original, as well as any custom properties.
+ */
 export declare function copySetStrict<Value extends Set<any>>(set: Value, state: State): Value;
 export {};

dist/min/types/utils.d.ts

 export interface Cache {
-    _keys?: any[];
-    _values?: any[];
     has: (value: any) => boolean;
@@ -22,7 +20,7 @@ set: (key: any, value: any) => void;
 export declare const getRegExpFlags: typeof getRegExpFlagsModern;
-declare function getTagModern(value: any): string;
+declare function getTagLegacy(value: any): string;
 /**
  * Get the tag of the value passed, so that the correct copier can be used.
  */
-export declare const getTag: typeof getTagModern;
+export declare const getTag: typeof getTagLegacy;
 export {};

dist/umd/index.js

@@ -10,2 +10,5 @@ (function (global, factory) {
     var toStringObject = Object.prototype.toString;
+    /**
+     * @classdesc Fallback cache for when WeakMap is not natively supported
+     */
     var LegacyCache = /** @class */ (function () {
@@ -101,8 +104,13 @@ function LegacyCache() {
     }
+    /**
+     * Get the properites used when copying objects strictly. This includes both keys and symbols.
+     */
     var getStrictProperties = SUPPORTS_SYMBOL
         ? getStrictPropertiesModern
         : getOwnPropertyNames;
+    /**
+     * Striclty copy all properties contained on the object.
+     */
     function copyOwnPropertiesStrict(value, clone, state) {
         var properties = getStrictProperties(value);
-        var copier = state.copier;
         for (var index = 0, length_1 = properties.length, property = void 0, descriptor = void 0; index < length_1; ++index) {
@@ -117,3 +125,3 @@ property = properties[index];
                 // the loose assignment.
-                clone[property] = copier(value[property], state);
+                clone[property] = state.copier(value[property], state);
                 continue;
@@ -123,3 +131,3 @@ }
             if (!descriptor.get && !descriptor.set) {
-                descriptor.value = copier(descriptor.value, state);
+                descriptor.value = state.copier(descriptor.value, state);
             }
@@ -136,37 +144,62 @@ try {
     }
+    /**
+     * Deeply copy the indexed values in the array.
+     */
     function copyArrayLoose(array, state) {
         var clone = new state.Constructor();
-        var cache = state.cache, copier = state.copier;
-        cache.set(array, clone);
+        // set in the cache immediately to be able to reuse the object recursively
+        state.cache.set(array, clone);
         for (var index = 0, length_2 = array.length; index < length_2; ++index) {
-            clone[index] = copier(array[index], state);
+            clone[index] = state.copier(array[index], state);
         }
         return clone;
     }
+    /**
+     * Deeply copy the indexed values in the array, as well as any custom properties.
+     */
     function copyArrayStrict(array, state) {
         var clone = new state.Constructor();
+        // set in the cache immediately to be able to reuse the object recursively
         state.cache.set(array, clone);
         return copyOwnPropertiesStrict(array, clone, state);
     }
+    /**
+     * Copy the contents of the ArrayBuffer.
+     */
     function copyArrayBuffer(arrayBuffer, _state) {
         return arrayBuffer.slice(0);
     }
+    /**
+     * Create a new Blob with the contents of the original.
+     */
     function copyBlob(blob, _state) {
         return blob.slice(0, blob.size, blob.type);
     }
+    /**
+     * Create a new DataView with the contents of the original.
+     */
     function copyDataView(dataView, state) {
         return new state.Constructor(copyArrayBuffer(dataView.buffer));
     }
+    /**
+     * Create a new Date based on the time of the original.
+     */
     function copyDate(date, state) {
         return new state.Constructor(date.getTime());
     }
+    /**
+     * Deeply copy the keys and values of the original.
+     */
     function copyMapLoose(map, state) {
         var clone = new state.Constructor();
-        var cache = state.cache, copier = state.copier;
-        cache.set(map, clone);
+        // set in the cache immediately to be able to reuse the object recursively
+        state.cache.set(map, clone);
         map.forEach(function (value, key) {
-            clone.set(key, copier(value, state));
+            clone.set(key, state.copier(value, state));
         });
         return clone;
     }
+    /**
+     * Deeply copy the keys and values of the original, as well as any custom properties.
+     */
     function copyMapStrict(map, state) {
@@ -177,8 +210,7 @@ return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);
         var clone = getCleanClone(state.prototype);
-        var cache = state.cache, copier = state.copier;
         // set in the cache immediately to be able to reuse the object recursively
-        cache.set(object, clone);
+        state.cache.set(object, clone);
         for (var key in object) {
             if (hasOwnProperty.call(object, key)) {
-                clone[key] = copier(object[key], state);
+                clone[key] = state.copier(object[key], state);
             }
@@ -190,8 +222,7 @@ }
         var clone = getCleanClone(state.prototype);
-        var cache = state.cache, copier = state.copier;
         // set in the cache immediately to be able to reuse the object recursively
-        cache.set(object, clone);
+        state.cache.set(object, clone);
         for (var key in object) {
             if (hasOwnProperty.call(object, key)) {
-                clone[key] = copier(object[key], state);
+                clone[key] = state.copier(object[key], state);
             }
@@ -203,3 +234,3 @@ }
             if (propertyIsEnumerable.call(object, symbol)) {
-                clone[symbol] = copier(object[symbol], state);
+                clone[symbol] = state.copier(object[symbol], state);
             }
@@ -210,4 +241,3 @@ }
     /**
-     * Get a copy of the object based on loose rules, meaning all enumerable keys
-     * and symbols are copied, but property descriptors are not considered.
+     * Deeply copy the properties (keys and symbols) and values of the original.
      */
@@ -218,4 +248,4 @@ var copyObjectLoose = SUPPORTS_SYMBOL
     /**
-     * Get a copy of the object based on strict rules, meaning all keys and symbols
-     * are copied based on the original property descriptors.
+     * Deeply copy the properties (keys and symbols) and values of the original, as well
+     * as any hidden or non-enumerable properties.
      */
@@ -228,2 +258,11 @@ function copyObjectStrict(object, state) {
     }
+    /**
+     * Create a new primitive wrapper from the value of the original.
+     */
+    function copyPrimitiveWrapper(primitiveObject, state) {
+        return new state.Constructor(primitiveObject.valueOf());
+    }
+    /**
+     * Create a new RegExp based on the value and flags of the original.
+     */
     function copyRegExp(regExp, state) {
@@ -234,14 +273,26 @@ var clone = new state.Constructor(regExp.source, getRegExpFlags(regExp));
     }
+    /**
+     * Return the original value (an identity function).
+     *
+     * @note
+     * THis is used for objects that cannot be copied, such as WeakMap.
+     */
     function copySelf(value, _state) {
         return value;
     }
+    /**
+     * Deeply copy the values of the original.
+     */
     function copySetLoose(set, state) {
         var clone = new state.Constructor();
-        var cache = state.cache, copier = state.copier;
-        cache.set(set, clone);
+        // set in the cache immediately to be able to reuse the object recursively
+        state.cache.set(set, clone);
         set.forEach(function (value) {
-            clone.add(copier(value, state));
+            clone.add(state.copier(value, state));
         });
         return clone;
     }
+    /**
+     * Deeply copy the values of the original, as well as any custom properties.
+     */
     function copySetStrict(set, state) {
@@ -252,33 +303,62 @@ return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);
     var isArray = Array.isArray;
-    var getPrototypeOf = Object.getPrototypeOf;
+    var assign = Object.assign, getPrototypeOf = Object.getPrototypeOf;
+    var DEFAULT_LOOSE_OPTIONS = {
+        array: copyArrayLoose,
+        arrayBuffer: copyArrayBuffer,
+        blob: copyBlob,
+        dataView: copyDataView,
+        date: copyDate,
+        error: copySelf,
+        map: copyMapLoose,
+        object: copyObjectLoose,
+        regExp: copyRegExp,
+        set: copySetLoose,
+    };
+    var DEFAULT_STRICT_OPTIONS = assign({}, DEFAULT_LOOSE_OPTIONS, {
+        array: copyArrayStrict,
+        map: copyMapStrict,
+        object: copyObjectStrict,
+        set: copySetStrict,
+    });
     /**
-     * Create a custom copier based on the object-specific copy methods passed.
+     * Get the copiers used for each specific object tag.
      */
-    function createCopier(options) {
-        var _a = options.array, array = _a === void 0 ? copyArrayLoose : _a, _b = options.arrayBuffer, arrayBuffer = _b === void 0 ? copyArrayBuffer : _b, _c = options.blob, blob = _c === void 0 ? copyBlob : _c, _d = options.dataView, dataView = _d === void 0 ? copyDataView : _d, _e = options.date, date = _e === void 0 ? copyDate : _e, _f = options.error, error = _f === void 0 ? copySelf : _f, _g = options.map, map = _g === void 0 ? copyMapLoose : _g, _h = options.object, object = _h === void 0 ? copyObjectLoose : _h, _j = options.regExp, regExp = _j === void 0 ? copyRegExp : _j, _k = options.set, set = _k === void 0 ? copySetLoose : _k;
-        var tagSpecificCopiers = {
-            Array: array,
-            ArrayBuffer: arrayBuffer,
-            Blob: blob,
-            DataView: dataView,
-            Date: date,
-            Error: error,
-            Float32Array: arrayBuffer,
-            Float64Array: arrayBuffer,
-            Int8Array: arrayBuffer,
-            Int16Array: arrayBuffer,
-            Int32Array: arrayBuffer,
-            Map: map,
-            Object: object,
+    function getTagSpecificCopiers(options) {
+        return {
+            Arguments: options.object,
+            Array: options.array,
+            ArrayBuffer: options.arrayBuffer,
+            Blob: options.blob,
+            Boolean: copyPrimitiveWrapper,
+            DataView: options.dataView,
+            Date: options.date,
+            Error: options.error,
+            Float32Array: options.arrayBuffer,
+            Float64Array: options.arrayBuffer,
+            Int8Array: options.arrayBuffer,
+            Int16Array: options.arrayBuffer,
+            Int32Array: options.arrayBuffer,
+            Map: options.map,
+            Number: copyPrimitiveWrapper,
+            Object: options.object,
             Promise: copySelf,
-            RegExp: regExp,
-            Set: set,
+            RegExp: options.regExp,
+            Set: options.set,
+            String: copyPrimitiveWrapper,
             WeakMap: copySelf,
             WeakSet: copySelf,
-            Uint8Array: arrayBuffer,
-            Uint8ClampedArray: arrayBuffer,
-            Uint16Array: arrayBuffer,
-            Uint32Array: arrayBuffer,
-            Uint64Array: arrayBuffer,
+            Uint8Array: options.arrayBuffer,
+            Uint8ClampedArray: options.arrayBuffer,
+            Uint16Array: options.arrayBuffer,
+            Uint32Array: options.arrayBuffer,
+            Uint64Array: options.arrayBuffer,
         };
+    }
+    /**
+     * Create a custom copier based on the object-specific copy methods passed.
+     */
+    function createCopier(options) {
+        var normalizedOptions = assign({}, DEFAULT_LOOSE_OPTIONS, options);
+        var tagSpecificCopiers = getTagSpecificCopiers(normalizedOptions);
+        var array = tagSpecificCopiers.Array, object = tagSpecificCopiers.Object;
         function copier(value, state) {
@@ -322,8 +402,3 @@ state.prototype = state.Constructor = undefined;
     function createStrictCopier(options) {
-        return createCopier(Object.assign({
-            array: copyArrayStrict,
-            map: copyMapStrict,
-            object: copyObjectStrict,
-            set: copySetStrict,
-        }, options));
+        return createCopier(assign({}, DEFAULT_STRICT_OPTIONS, options));
     }
@@ -330,0 +405,0 @@ /**

dist/umd/index.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"index.js","sources":["../../../../src/utils.ts","../../../../src/copier.ts","../../../../src/index.ts"],"sourcesContent":["import type { CreateCopierOptions } from './index';\n\nexport interface Cache {\n  _keys?: any[];\n  _values?: any[];\n  has: (value: any) => boolean;\n  set: (key: any, value: any) => void;\n  get: (key: any) => any;\n}\n\nconst { toString: toStringFunction } = Function.prototype;\nconst { create } = Object;\nconst { toString: toStringObject } = Object.prototype;\n\nclass LegacyCache {\n  _keys: any[] = [];\n  _values: any[] = [];\n\n  has(key: any) {\n    return !!~this._keys.indexOf(key);\n  }\n\n  get(key: any) {\n    return this._values[this._keys.indexOf(key)];\n  }\n\n  set(key: any, value: any) {\n    this._keys.push(key);\n    this._values.push(value);\n  }\n}\n\nfunction createCacheLegacy(): Cache {\n  return new LegacyCache();\n}\n\nfunction createCacheModern(): Cache {\n  return new WeakMap();\n}\n\n/**\n * Get a new cache object to prevent circular references.\n */\nexport const createCache =\n  typeof WeakMap !== 'undefined' ? createCacheModern : createCacheLegacy;\n\n/**\n * Get an empty version of the object with the same prototype it has.\n */\nexport function getCleanClone(prototype: any): any {\n  if (!prototype) {\n    return create(null);\n  }\n\n  const Constructor = prototype.constructor;\n\n  if (Constructor === Object) {\n    return prototype === Object.prototype ? {} : create(prototype);\n  }\n\n  if (~toStringFunction.call(Constructor).indexOf('[native code]')) {\n    try {\n      return new Constructor();\n    } catch {}\n  }\n\n  return create(prototype);\n}\n\nfunction getRegExpFlagsLegacy(regExp: RegExp): string {\n  let flags = '';\n\n  if (regExp.global) {\n    flags += 'g';\n  }\n\n  if (regExp.ignoreCase) {\n    flags += 'i';\n  }\n\n  if (regExp.multiline) {\n    flags += 'm';\n  }\n\n  if (regExp.unicode) {\n    flags += 'u';\n  }\n\n  if (regExp.sticky) {\n    flags += 'y';\n  }\n\n  return flags;\n}\n\nfunction getRegExpFlagsModern(regExp: RegExp): string {\n  return regExp.flags;\n}\n\n/**\n * Get the flags to apply to the copied regexp.\n */\nexport const getRegExpFlags =\n  /test/g.flags === 'g' ? getRegExpFlagsModern : getRegExpFlagsLegacy;\n\nfunction getTagLegacy(value: any): string {\n  const type = toStringObject.call(value);\n\n  return type.substring(8, type.length - 1);\n}\n\nfunction getTagModern(value: any): string {\n  return value[Symbol.toStringTag] || getTagLegacy(value);\n}\n\n/**\n * Get the tag of the value passed, so that the correct copier can be used.\n */\nexport const getTag =\n  typeof Symbol !== 'undefined' ? getTagModern : getTagLegacy;\n","import { getCleanClone, getRegExpFlags } from './utils';\n\nimport type { Cache } from './utils';\n\nexport type InternalCopier<Value = any> = (value: Value, state: State) => Value;\n\nexport interface State {\n  Constructor: any;\n  cache: Cache;\n  copier: InternalCopier;\n  prototype: any;\n}\n\nconst {\n  defineProperty,\n  getOwnPropertyDescriptor,\n  getOwnPropertyNames,\n  getOwnPropertySymbols,\n} = Object;\nconst { hasOwnProperty, propertyIsEnumerable } = Object.prototype;\n\nconst SUPPORTS_SYMBOL = typeof getOwnPropertySymbols === 'function';\n\nfunction getStrictPropertiesModern(object: any): Array<string | symbol> {\n  return (getOwnPropertyNames(object) as Array<string | symbol>).concat(\n    getOwnPropertySymbols(object)\n  );\n}\n\nconst getStrictProperties = SUPPORTS_SYMBOL\n  ? getStrictPropertiesModern\n  : getOwnPropertyNames;\n\nfunction copyOwnPropertiesStrict<Value extends any>(\n  value: Value,\n  clone: Value,\n  state: State\n): Value {\n  const properties = getStrictProperties(value);\n  const { copier } = state;\n\n  for (\n    let index = 0, length = properties.length, property, descriptor;\n    index < length;\n    ++index\n  ) {\n    property = properties[index];\n\n    if (property === 'callee' || property === 'caller') {\n      continue;\n    }\n\n    descriptor = getOwnPropertyDescriptor(value, property);\n\n    if (!descriptor) {\n      // In extra edge cases where the property descriptor cannot be retrived, fall back to\n      // the loose assignment.\n      (clone as any)[property] = copier((value as any)[property], state);\n      continue;\n    }\n\n    // Only clone the value if actually a value, not a getter / setter.\n    if (!descriptor.get && !descriptor.set) {\n      descriptor.value = copier(descriptor.value, state);\n    }\n\n    try {\n      defineProperty(clone, property, descriptor);\n    } catch (error) {\n      // Tee above can fail on node in edge cases, so fall back to the loose assignment.\n      (clone as any)[property] = descriptor.value;\n    }\n  }\n\n  return clone;\n}\n\nexport function copyArrayLoose(array: any[], state: State) {\n  const clone = new state.Constructor();\n  const { cache, copier } = state;\n\n  cache.set(array, clone);\n\n  for (let index: number = 0, length = array.length; index < length; ++index) {\n    clone[index] = copier(array[index], state);\n  }\n\n  return clone;\n}\n\nexport function copyArrayStrict<Value extends any[]>(\n  array: Value,\n  state: State\n) {\n  const clone = new state.Constructor() as Value;\n\n  state.cache.set(array, clone);\n\n  return copyOwnPropertiesStrict(array, clone, state);\n}\n\nexport function copyArrayBuffer<Value extends ArrayBuffer>(\n  arrayBuffer: Value,\n  _state: State\n): Value {\n  return arrayBuffer.slice(0) as Value;\n}\n\nexport function copyBlob<Value extends Blob>(\n  blob: Value,\n  _state: State\n): Value {\n  return blob.slice(0, blob.size, blob.type) as Value;\n}\n\nexport function copyDataView<Value extends DataView>(\n  dataView: Value,\n  state: State\n): Value {\n  return new state.Constructor(copyArrayBuffer(dataView.buffer, state));\n}\n\nexport function copyDate<Value extends Date>(date: Value, state: State): Value {\n  return new state.Constructor(date.getTime());\n}\n\nexport function copyMapLoose<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n  const { cache, copier } = state;\n\n  cache.set(map, clone);\n\n  map.forEach((value, key) => {\n    clone.set(key, copier(value, state));\n  });\n\n  return clone;\n}\n\nexport function copyMapStrict<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n) {\n  return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);\n}\n\nfunction copyObjectLooseLegacy<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n  const { cache, copier } = state;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = copier(object[key], state);\n    }\n  }\n\n  return clone;\n}\n\nfunction copyObjectLooseModern<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n  const { cache, copier } = state;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = copier(object[key], state);\n    }\n  }\n\n  const symbols: symbol[] = getOwnPropertySymbols(object);\n\n  for (\n    let index = 0, length = symbols.length, symbol;\n    index < length;\n    ++index\n  ) {\n    symbol = symbols[index];\n\n    if (propertyIsEnumerable.call(object, symbol)) {\n      clone[symbol] = copier((object as any)[symbol], state);\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Get a copy of the object based on loose rules, meaning all enumerable keys\n * and symbols are copied, but property descriptors are not considered.\n */\nexport const copyObjectLoose = SUPPORTS_SYMBOL\n  ? copyObjectLooseModern\n  : copyObjectLooseLegacy;\n\n/**\n * Get a copy of the object based on strict rules, meaning all keys and symbols\n * are copied based on the original property descriptors.\n */\nexport function copyObjectStrict<Value extends {}>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  return copyOwnPropertiesStrict(object, clone, state);\n}\n\nexport function copyRegExp<Value extends RegExp>(\n  regExp: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor(\n    regExp.source,\n    getRegExpFlags(regExp)\n  ) as Value;\n\n  clone.lastIndex = regExp.lastIndex;\n\n  return clone;\n}\n\nexport function copySelf<Value>(value: Value, _state: State): Value {\n  return value;\n}\n\nexport function copySetLoose<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n  const { cache, copier } = state;\n\n  cache.set(set, clone);\n\n  set.forEach((value) => {\n    clone.add(copier(value, state));\n  });\n\n  return clone;\n}\n\nexport function copySetStrict<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);\n}\n","import {\n  copyArrayBuffer,\n  copyArrayLoose,\n  copyArrayStrict,\n  copyBlob,\n  copyDataView,\n  copyDate,\n  copyMapLoose,\n  copyMapStrict,\n  copyObjectLoose,\n  copyObjectStrict,\n  copyRegExp,\n  copySelf,\n  copySetLoose,\n  copySetStrict,\n} from './copier';\nimport { createCache, getTag } from './utils';\n\nimport type { InternalCopier, State } from './copier';\n\nexport type { State } from './copier';\n\nconst { isArray } = Array;\nconst { getPrototypeOf } = Object;\n\nexport interface CreateCopierOptions {\n  array?: InternalCopier<any[]>;\n  arrayBuffer?: InternalCopier<ArrayBuffer>;\n  blob?: InternalCopier<Blob>;\n  dataView?: InternalCopier<DataView>;\n  date?: InternalCopier<Date>;\n  error?: InternalCopier<any>;\n  map?: InternalCopier<Map<any, any>>;\n  object?: InternalCopier<Record<string, any>>;\n  regExp?: InternalCopier<RegExp>;\n  set?: InternalCopier<Set<any>>;\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed.\n */\nexport function createCopier(options: CreateCopierOptions) {\n  const {\n    array = copyArrayLoose,\n    arrayBuffer = copyArrayBuffer,\n    blob = copyBlob,\n    dataView = copyDataView,\n    date = copyDate,\n    error = copySelf,\n    map = copyMapLoose,\n    object = copyObjectLoose,\n    regExp = copyRegExp,\n    set = copySetLoose,\n  } = options;\n\n  const tagSpecificCopiers: Record<string, InternalCopier> = {\n    Array: array,\n    ArrayBuffer: arrayBuffer,\n    Blob: blob,\n    DataView: dataView,\n    Date: date,\n    Error: error,\n    Float32Array: arrayBuffer,\n    Float64Array: arrayBuffer,\n    Int8Array: arrayBuffer,\n    Int16Array: arrayBuffer,\n    Int32Array: arrayBuffer,\n    Map: map,\n    Object: object,\n    Promise: copySelf,\n    RegExp: regExp,\n    Set: set,\n    WeakMap: copySelf,\n    WeakSet: copySelf,\n    Uint8Array: arrayBuffer,\n    Uint8ClampedArray: arrayBuffer,\n    Uint16Array: arrayBuffer,\n    Uint32Array: arrayBuffer,\n    Uint64Array: arrayBuffer,\n  };\n\n  function copier(value: any, state: State): any {\n    state.prototype = state.Constructor = undefined;\n\n    if (!value || typeof value !== 'object') {\n      return value;\n    }\n\n    if (state.cache.has(value)) {\n      return state.cache.get(value);\n    }\n\n    state.prototype = value.__proto__ || getPrototypeOf(value);\n    state.Constructor = state.prototype && state.prototype.constructor;\n\n    // plain objects\n    if (!state.Constructor || state.Constructor === Object) {\n      return object(value, state);\n    }\n\n    // arrays\n    if (isArray(value)) {\n      return array(value, state);\n    }\n\n    const tagSpecificCopier = tagSpecificCopiers[getTag(value)];\n\n    if (tagSpecificCopier) {\n      return tagSpecificCopier(value, state);\n    }\n\n    return typeof value.then === 'function' ? value : object(value, state);\n  }\n\n  return function copy<Value>(value: Value): Value {\n    return copier(value, {\n      Constructor: undefined,\n      cache: createCache(),\n      copier,\n      prototype: undefined,\n    });\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed, defaulting to the\n * same internals as `copyStrict`.\n */\nexport function createStrictCopier(options: CreateCopierOptions) {\n  return createCopier(\n    Object.assign(\n      {\n        array: copyArrayStrict,\n        map: copyMapStrict,\n        object: copyObjectStrict,\n        set: copySetStrict,\n      },\n      options\n    )\n  );\n}\n\n/**\n * Copy an value deeply as much as possible, where strict recreation of object properties\n * are maintained. All properties (including non-enumerable ones) are copied with their\n * original property descriptors on both objects and arrays.\n */\nexport const copyStrict = createStrictCopier({});\n\n/**\n * Copy an value deeply as much as possible.\n */\nexport default 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This includes both keys and symbols.\n */\nconst getStrictProperties = SUPPORTS_SYMBOL\n  ? getStrictPropertiesModern\n  : getOwnPropertyNames;\n\n/**\n * Striclty copy all properties contained on the object.\n */\nfunction copyOwnPropertiesStrict<Value>(\n  value: Value,\n  clone: Value,\n  state: State\n): Value {\n  const properties = getStrictProperties(value);\n\n  for (\n    let index = 0, length = properties.length, property, descriptor;\n    index < length;\n    ++index\n  ) {\n    property = properties[index];\n\n    if (property === 'callee' || property === 'caller') {\n      continue;\n    }\n\n    descriptor = getOwnPropertyDescriptor(value, property);\n\n    if (!descriptor) {\n      // In extra edge cases where the property descriptor cannot be retrived, fall back to\n      // the loose assignment.\n      (clone as any)[property] = state.copier((value as any)[property], state);\n      continue;\n    }\n\n    // Only clone the value if actually a value, not a getter / setter.\n    if (!descriptor.get && !descriptor.set) {\n      descriptor.value = state.copier(descriptor.value, state);\n    }\n\n    try {\n      defineProperty(clone, property, descriptor);\n    } catch (error) {\n      // Tee above can fail on node in edge cases, so fall back to the loose assignment.\n      (clone as any)[property] = descriptor.value;\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the indexed values in the array.\n */\nexport function copyArrayLoose(array: any[], state: State) {\n  const clone = new state.Constructor();\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(array, clone);\n\n  for (let index = 0, length = array.length; index < length; ++index) {\n    clone[index] = state.copier(array[index], state);\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the indexed values in the array, as well as any custom properties.\n */\nexport function copyArrayStrict<Value extends any[]>(\n  array: Value,\n  state: State\n) {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(array, clone);\n\n  return copyOwnPropertiesStrict(array, clone, state);\n}\n\n/**\n * Copy the contents of the ArrayBuffer.\n */\nexport function copyArrayBuffer<Value extends ArrayBuffer>(\n  arrayBuffer: Value,\n  _state: State\n): Value {\n  return arrayBuffer.slice(0) as Value;\n}\n\n/**\n * Create a new Blob with the contents of the original.\n */\nexport function copyBlob<Value extends Blob>(\n  blob: Value,\n  _state: State\n): Value {\n  return blob.slice(0, blob.size, blob.type) as Value;\n}\n\n/**\n * Create a new DataView with the contents of the original.\n */\nexport function copyDataView<Value extends DataView>(\n  dataView: Value,\n  state: State\n): Value {\n  return new state.Constructor(copyArrayBuffer(dataView.buffer, state));\n}\n\n/**\n * Create a new Date based on the time of the original.\n */\nexport function copyDate<Value extends Date>(date: Value, state: State): Value {\n  return new state.Constructor(date.getTime());\n}\n\n/**\n * Deeply copy the keys and values of the original.\n */\nexport function copyMapLoose<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(map, clone);\n\n  map.forEach((value, key) => {\n    clone.set(key, state.copier(value, state));\n  });\n\n  return clone;\n}\n\n/**\n * Deeply copy the keys and values of the original, as well as any custom properties.\n */\nexport function copyMapStrict<Value extends Map<any, any>>(\n  map: Value,\n  state: State\n) {\n  return copyOwnPropertiesStrict(map, copyMapLoose(map, state), state);\n}\n\nfunction copyObjectLooseLegacy<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone: any = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = state.copier(object[key], state);\n    }\n  }\n\n  return clone;\n}\n\nfunction copyObjectLooseModern<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  for (const key in object) {\n    if (hasOwnProperty.call(object, key)) {\n      clone[key] = state.copier(object[key], state);\n    }\n  }\n\n  const symbols = getOwnPropertySymbols(object);\n\n  for (\n    let index = 0, length = symbols.length, symbol;\n    index < length;\n    ++index\n  ) {\n    symbol = symbols[index];\n\n    if (propertyIsEnumerable.call(object, symbol)) {\n      clone[symbol] = state.copier((object as any)[symbol], state);\n    }\n  }\n\n  return clone;\n}\n\n/**\n * Deeply copy the properties (keys and symbols) and values of the original.\n */\nexport const copyObjectLoose = SUPPORTS_SYMBOL\n  ? copyObjectLooseModern\n  : copyObjectLooseLegacy;\n\n/**\n * Deeply copy the properties (keys and symbols) and values of the original, as well\n * as any hidden or non-enumerable properties.\n */\nexport function copyObjectStrict<Value extends Record<string, any>>(\n  object: Value,\n  state: State\n): Value {\n  const clone = getCleanClone(state.prototype);\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(object, clone);\n\n  return copyOwnPropertiesStrict(object, clone, state);\n}\n\n/**\n * Create a new primitive wrapper from the value of the original.\n */\nexport function copyPrimitiveWrapper<\n  // Specifically use the object constructor types\n  // eslint-disable-next-line @typescript-eslint/ban-types\n  Value extends Boolean | Number | String\n>(primitiveObject: Value, state: State): Value {\n  return new state.Constructor(primitiveObject.valueOf());\n}\n\n/**\n * Create a new RegExp based on the value and flags of the original.\n */\nexport function copyRegExp<Value extends RegExp>(\n  regExp: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor(\n    regExp.source,\n    getRegExpFlags(regExp)\n  ) as Value;\n\n  clone.lastIndex = regExp.lastIndex;\n\n  return clone;\n}\n\n/**\n * Return the original value (an identity function).\n *\n * @note\n * THis is used for objects that cannot be copied, such as WeakMap.\n */\nexport function copySelf<Value>(value: Value, _state: State): Value {\n  return value;\n}\n\n/**\n * Deeply copy the values of the original.\n */\nexport function copySetLoose<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  const clone = new state.Constructor() as Value;\n\n  // set in the cache immediately to be able to reuse the object recursively\n  state.cache.set(set, clone);\n\n  set.forEach((value) => {\n    clone.add(state.copier(value, state));\n  });\n\n  return clone;\n}\n\n/**\n * Deeply copy the values of the original, as well as any custom properties.\n */\nexport function copySetStrict<Value extends Set<any>>(\n  set: Value,\n  state: State\n): Value {\n  return copyOwnPropertiesStrict(set, copySetLoose(set, state), state);\n}\n","import {\n  copyArrayBuffer,\n  copyArrayLoose,\n  copyArrayStrict,\n  copyBlob,\n  copyDataView,\n  copyDate,\n  copyMapLoose,\n  copyMapStrict,\n  copyObjectLoose,\n  copyObjectStrict,\n  copyPrimitiveWrapper,\n  copyRegExp,\n  copySelf,\n  copySetLoose,\n  copySetStrict,\n} from './copier';\nimport { createCache, getTag } from './utils';\n\nimport type { InternalCopier, State } from './copier';\n\nexport type { State } from './copier';\n\nconst { isArray } = Array;\nconst { assign, getPrototypeOf } = Object;\n\nexport interface CreateCopierOptions {\n  array?: InternalCopier<any[]>;\n  arrayBuffer?: InternalCopier<ArrayBuffer>;\n  blob?: InternalCopier<Blob>;\n  dataView?: InternalCopier<DataView>;\n  date?: InternalCopier<Date>;\n  error?: InternalCopier<any>;\n  map?: InternalCopier<Map<any, any>>;\n  object?: InternalCopier<Record<string, any>>;\n  regExp?: InternalCopier<RegExp>;\n  set?: InternalCopier<Set<any>>;\n}\n\nconst DEFAULT_LOOSE_OPTIONS: Required<CreateCopierOptions> = {\n  array: copyArrayLoose,\n  arrayBuffer: copyArrayBuffer,\n  blob: copyBlob,\n  dataView: copyDataView,\n  date: copyDate,\n  error: copySelf,\n  map: copyMapLoose,\n  object: copyObjectLoose,\n  regExp: copyRegExp,\n  set: copySetLoose,\n};\nconst DEFAULT_STRICT_OPTIONS: Required<CreateCopierOptions> = assign(\n  {},\n  DEFAULT_LOOSE_OPTIONS,\n  {\n    array: copyArrayStrict,\n    map: copyMapStrict,\n    object: copyObjectStrict,\n    set: copySetStrict,\n  }\n);\n\n/**\n * Get the copiers used for each specific object tag.\n */\nfunction getTagSpecificCopiers(\n  options: Required<CreateCopierOptions>\n): Record<string, InternalCopier<any>> {\n  return {\n    Arguments: options.object,\n    Array: options.array,\n    ArrayBuffer: options.arrayBuffer,\n    Blob: options.blob,\n    Boolean: copyPrimitiveWrapper,\n    DataView: options.dataView,\n    Date: options.date,\n    Error: options.error,\n    Float32Array: options.arrayBuffer,\n    Float64Array: options.arrayBuffer,\n    Int8Array: options.arrayBuffer,\n    Int16Array: options.arrayBuffer,\n    Int32Array: options.arrayBuffer,\n    Map: options.map,\n    Number: copyPrimitiveWrapper,\n    Object: options.object,\n    Promise: copySelf,\n    RegExp: options.regExp,\n    Set: options.set,\n    String: copyPrimitiveWrapper,\n    WeakMap: copySelf,\n    WeakSet: copySelf,\n    Uint8Array: options.arrayBuffer,\n    Uint8ClampedArray: options.arrayBuffer,\n    Uint16Array: options.arrayBuffer,\n    Uint32Array: options.arrayBuffer,\n    Uint64Array: options.arrayBuffer,\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed.\n */\nexport function createCopier(options: CreateCopierOptions) {\n  const normalizedOptions = assign({}, DEFAULT_LOOSE_OPTIONS, options);\n  const tagSpecificCopiers = getTagSpecificCopiers(normalizedOptions);\n  const { Array: array, Object: object } = tagSpecificCopiers;\n\n  function copier(value: any, state: State): any {\n    state.prototype = state.Constructor = undefined;\n\n    if (!value || typeof value !== 'object') {\n      return value;\n    }\n\n    if (state.cache.has(value)) {\n      return state.cache.get(value);\n    }\n\n    state.prototype = value.__proto__ || getPrototypeOf(value);\n    state.Constructor = state.prototype && state.prototype.constructor;\n\n    // plain objects\n    if (!state.Constructor || state.Constructor === Object) {\n      return object(value, state);\n    }\n\n    // arrays\n    if (isArray(value)) {\n      return array(value, state);\n    }\n\n    const tagSpecificCopier = tagSpecificCopiers[getTag(value)];\n\n    if (tagSpecificCopier) {\n      return tagSpecificCopier(value, state);\n    }\n\n    return typeof value.then === 'function' ? value : object(value, state);\n  }\n\n  return function copy<Value>(value: Value): Value {\n    return copier(value, {\n      Constructor: undefined,\n      cache: createCache(),\n      copier,\n      prototype: undefined,\n    });\n  };\n}\n\n/**\n * Create a custom copier based on the object-specific copy methods passed, defaulting to the\n * same internals as `copyStrict`.\n */\nexport function createStrictCopier(options: CreateCopierOptions) {\n  return createCopier(assign({}, DEFAULT_STRICT_OPTIONS, options));\n}\n\n/**\n * Copy an value deeply as much as possible, where strict recreation of object properties\n * are maintained. 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dist/umd/types/copier.d.ts

 import type { Cache } from './utils';
-export declare type InternalCopier<Value = any> = (value: Value, state: State) => Value;
+export declare type InternalCopier<Value> = (value: Value, state: State) => Value;
 export interface State {
     Constructor: any;
     cache: Cache;
-    copier: InternalCopier;
+    copier: InternalCopier<any>;
     prototype: any;
 }
+/**
+ * Deeply copy the indexed values in the array.
+ */
 export declare function copyArrayLoose(array: any[], state: State): any;
+/**
+ * Deeply copy the indexed values in the array, as well as any custom properties.
+ */
 export declare function copyArrayStrict<Value extends any[]>(array: Value, state: State): Value;
+/**
+ * Copy the contents of the ArrayBuffer.
+ */
 export declare function copyArrayBuffer<Value extends ArrayBuffer>(arrayBuffer: Value, _state: State): Value;
+/**
+ * Create a new Blob with the contents of the original.
+ */
 export declare function copyBlob<Value extends Blob>(blob: Value, _state: State): Value;
+/**
+ * Create a new DataView with the contents of the original.
+ */
 export declare function copyDataView<Value extends DataView>(dataView: Value, state: State): Value;
+/**
+ * Create a new Date based on the time of the original.
+ */
 export declare function copyDate<Value extends Date>(date: Value, state: State): Value;
+/**
+ * Deeply copy the keys and values of the original.
+ */
 export declare function copyMapLoose<Value extends Map<any, any>>(map: Value, state: State): Value;
+/**
+ * Deeply copy the keys and values of the original, as well as any custom properties.
+ */
 export declare function copyMapStrict<Value extends Map<any, any>>(map: Value, state: State): Value;
-declare function copyObjectLooseModern<Value extends {}>(object: Value, state: State): Value;
+declare function copyObjectLooseModern<Value extends Record<string, any>>(object: Value, state: State): Value;
 /**
- * Get a copy of the object based on loose rules, meaning all enumerable keys
- * and symbols are copied, but property descriptors are not considered.
+ * Deeply copy the properties (keys and symbols) and values of the original.
  */
 export declare const copyObjectLoose: typeof copyObjectLooseModern;
 /**
- * Get a copy of the object based on strict rules, meaning all keys and symbols
- * are copied based on the original property descriptors.
+ * Deeply copy the properties (keys and symbols) and values of the original, as well
+ * as any hidden or non-enumerable properties.
  */
-export declare function copyObjectStrict<Value extends {}>(object: Value, state: State): Value;
+export declare function copyObjectStrict<Value extends Record<string, any>>(object: Value, state: State): Value;
+/**
+ * Create a new primitive wrapper from the value of the original.
+ */
+export declare function copyPrimitiveWrapper<Value extends Boolean | Number | String>(primitiveObject: Value, state: State): Value;
+/**
+ * Create a new RegExp based on the value and flags of the original.
+ */
 export declare function copyRegExp<Value extends RegExp>(regExp: Value, state: State): Value;
+/**
+ * Return the original value (an identity function).
+ *
+ * @note
+ * THis is used for objects that cannot be copied, such as WeakMap.
+ */
 export declare function copySelf<Value>(value: Value, _state: State): Value;
+/**
+ * Deeply copy the values of the original.
+ */
 export declare function copySetLoose<Value extends Set<any>>(set: Value, state: State): Value;
+/**
+ * Deeply copy the values of the original, as well as any custom properties.
+ */
 export declare function copySetStrict<Value extends Set<any>>(set: Value, state: State): Value;
 export {};

dist/umd/types/utils.d.ts

 export interface Cache {
-    _keys?: any[];
-    _values?: any[];
     has: (value: any) => boolean;
@@ -22,7 +20,7 @@ set: (key: any, value: any) => void;
 export declare const getRegExpFlags: typeof getRegExpFlagsModern;
-declare function getTagModern(value: any): string;
+declare function getTagLegacy(value: any): string;
 /**
  * Get the tag of the value passed, so that the correct copier can be used.
  */
-export declare const getTag: typeof getTagModern;
+export declare const getTag: typeof getTagLegacy;
 export {};

index.d.ts

@@ -21,3 +21,3 @@ interface Cache {
 
-type InternalCopier<Value = any> = (value: Value, state: State) => Value;
+type InternalCopier<Value> = (value: Value, state: State) => Value;
 
@@ -27,3 +27,3 @@ export interface State {
   cache: Cache;
-  copier: InternalCopier;
+  copier: InternalCopier<any>;
   prototype: any;
@@ -30,0 +30,0 @@ }

package.json

@@ -88,3 +88,3 @@ {
     "dist": "npm run clean && npm run build",
-    "lint": "eslint 'src/*.ts'",
+    "lint": "eslint 'src/*.ts' '__tests__/*.ts' 'DEV_ONLY/*.ts'",
     "lint:fix": "npm run lint -- --fix",
@@ -99,7 +99,7 @@ "prepublishOnly": "npm run lint && npm run typecheck && npm run test && npm run dist",
     "test:watch": "npm run test -- --watch",
-    "typecheck": "tsc src/*.ts --noEmit"
+    "typecheck": "tsc --noEmit"
   },
   "type": "module",
   "types": "index.d.ts",
-  "version": "3.0.0-beta.7"
+  "version": "3.0.0-beta.8"
 }

README.md

@@ -18,2 +18,6 @@ # fast-copy
     - [`createCopier`](#createcopier)
+      - [Copier state](#copier-state)
+        - [`cache`](#cache)
+        - [`copier`](#copier)
+        - [`Constructor` / `prototype`](#constructor--prototype)
     - [`createStrictCopier`](#createstrictcopier)
@@ -102,2 +106,89 @@ - [Copier methods](#copier-methods)
 
+Each internal copier method has the following contract:
+
+```ts
+type InternalCopier<Value> = (value: Value, state: State) => Value;
+
+interface State {
+  Constructor: any;
+  cache: WeakMap;
+  copier: InternalCopier<any>;
+  prototype: any;
+}
+```
+
+Any method overriding the defaults must maintain this contract.
+
+#### Copier state
+
+##### `cache`
+
+If you want to maintain circular reference handling, then you'll need the methods to handle cache population for future lookups:
+
+```ts
+function shallowlyCloneArray<Value extends any[]>(
+  value: Value,
+  state: State
+): Value {
+  const clone = [...value];
+
+  state.cache.set(value, clone);
+
+  return clone;
+}
+```
+
+##### `copier`
+
+`copier` is provided for recursive calls with deeply-nested objects.
+
+```ts
+function deeplyCloneArray<Value extends any[]>(
+  value: Value,
+  state: State
+): Value {
+  const clone = [];
+
+  state.cache.set(value, clone);
+
+  value.forEach((item) => state.copier(item, state));
+
+  return clone;
+}
+```
+
+Note above I am using `forEach` instead of a simple `map`. This is because it is highly recommended to store the clone in [`cache`](#cache) eagerly when deeply copying, so that nested circular references are handled correctly.
+
+##### `Constructor` / `prototype`
+
+Both `Constructor` and `prototype` properties are only populated with complex objects that are not standard objects or arrays. This is mainly useful for custom subclasses of these globals, or maintaining custom prototypes of objects.
+
+```ts
+function deeplyCloneSubclassArray<Value extends CustomArray>(
+  value: Value,
+  state: State
+): Value {
+  const clone = new state.Constructor();
+
+  state.cache.set(value, clone);
+
+  value.forEach((item) => clone.push(item));
+
+  return clone;
+}
+
+function deeplyCloneCustomObject<Value extends CustomObject>(
+  value: Value,
+  state: State
+): Value {
+  const clone = Object.create(state.prototype);
+
+  state.cache.set(value, clone);
+
+  Object.entries(value).forEach(([k, v]) => (clone[k] = v));
+
+  return clone;
+}
+```
+
 ### `createStrictCopier`
@@ -211,9 +302,9 @@
 | ------------------ | ------------------- |
-| **fast-copy**      | **5,743,509**       |
-| lodash.cloneDeep   | 2,614,035           |
-| clone              | 2,173,098           |
-| fast-clone         | 1,341,313           |
-| deepclone          | 1,238,167           |
-| ramda              | 1,115,519           |
-| fast-copy (strict) | 845,093             |
+| **fast-copy**      | **5,880,312**       |
+| lodash.cloneDeep   | 2,706,261           |
+| clone              | 2,207,231           |
+| deepclone          | 1,274,810           |
+| fast-clone         | 1,239,952           |
+| ramda              | 1,146,152           |
+| fast-copy (strict) | 852,382             |
 
@@ -226,9 +317,9 @@ #### Complex objects
 | ------------------ | ------------------- |
-| **fast-copy**      | **160,060**         |
-| ramda              | 134,873             |
-| deepclone          | 131,345             |
-| fast-clone         | 49,911              |
-| clone              | 75,780              |
-| fast-copy (strict) | 61,556              |
-| lodash.cloneDeep   | 59,493              |
+| **fast-copy**      | **162,858**         |
+| ramda              | 142,104             |
+| deepclone          | 133,607             |
+| fast-clone         | 101,143             |
+| clone              | 70,872              |
+| fast-copy (strict) | 62,961              |
+| lodash.cloneDeep   | 62,060              |
 
@@ -241,8 +332,8 @@ #### Big data
 | ------------------ | ------------------- |
-| **fast-copy**      | 304                 |
-| fast-clone         | 236                 |
+| **fast-copy**      | 303                 |
+| fast-clone         | 245                 |
+| deepclone          | 151                 |
 | lodash.cloneDeep   | 150                 |
-| deepclone          | 148                 |
-| clone              | 90                  |
-| fast-copy (strict) | 89                  |
+| clone              | 93                  |
+| fast-copy (strict) | 90                  |
 | ramda              | 42                  |
@@ -256,8 +347,8 @@
 | ------------------ | ------------------- |
-| **fast-copy**      | **2,273,405**       |
-| deepclone          | 1,299,928           |
-| ramda              | 951,721             |
-| clone              | 945,585             |
-| lodash.cloneDeep   | 887,775             |
-| fast-copy (strict) | 630,221             |
+| **fast-copy**      | **2,420,466**       |
+| deepclone          | 1,386,896           |
+| ramda              | 1,024,108           |
+| lodash.cloneDeep   | 989,796             |
+| clone              | 987,721             |
+| fast-copy (strict) | 617,602             |
 | fast-clone         | 0 (not supported)   |
@@ -271,9 +362,9 @@
 | ------------------ | ------------------- |
-| **fast-copy**      | **144,616**         |
-| clone              | 68,880              |
-| fast-clone         | 66,233              |
-| lodash.cloneDeep   | 63,376              |
-| ramda              | 52,216              |
-| deepclone          | 28,394              |
-| fast-copy (strict) | 21,033              |
+| **fast-copy**      | **152,792**         |
+| clone              | 74,347              |
+| fast-clone         | 66,576              |
+| lodash.cloneDeep   | 64,760              |
+| ramda              | 53,542              |
+| deepclone          | 28,823              |
+| fast-copy (strict) | 21,362              |
 
@@ -285,8 +376,10 @@ ## Development
 - benchmark => run benchmark tests against other equality libraries
-- build => run `build:files` and `build:types`
-- build:files => build dist files with `rollup`
-- build:types => build TypeScript types for consumers
+- build => run `build:esm`, `build:cjs`, `build:umd`, and `build:min` scripts
+- build:cjs => build CJS files and types
+- build:esm => build ESM files and types
+- build:min => build minified files and types
+- build:umd => build UMD files and types
 - clean => run `rimraf` on the `dist` folder
 - dev => start webpack playground App
-- dist => run `build` and `build:minified` scripts
+- dist => run `clean` and `build` scripts
 - lint => run ESLint on all files in `src` folder (also runs on `dev` script)
@@ -302,1 +395,2 @@ - lint:fix => run `lint` script, but with auto-fixer
 - test:watch => run same script as `test` but keep persistent watcher
+- typecheck => run `tsc` on the codebase

No alert changes

Improved metrics

Total package byte prevSize

195299

12.55%

Lines of code

1951

24.43%

Number of lines in readme file

388

31.97%

No dependency changes