@xylabs/object
Advanced tools
Base functionality used throughout XY Labs TypeScript/JavaScript libraries
Base functionality used throughout XY Labs TypeScript/JavaScript libraries
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See the LICENSE file for license rights and limitations (LGPL-3.0-only).
### .temp-typedoc
### index
### index-deprecated
### functions
### <a id="isType"></a>isType
function isType(value, expectedType): boolean;
unknown
FieldType
boolean
use from @xylabs/typeof instead
### index-un-deprecated
### classes
### <a id="IsObjectFactory"></a>IsObjectFactory
Factory class for creating type-guard functions that validate objects against a given shape and optional additional checks.
T extends TypedObject
new IsObjectFactory<T>(): IsObjectFactory<T>;
IsObjectFactory<T>
create(shape?, additionalChecks?): TypeCheck<T>;
Creates a type-guard function that validates an object matches the given shape and passes additional checks.
ObjectTypeShape
An optional map of property names to expected types.
TypeCheck<TypedObject>[]
Optional extra type-check functions to run after shape validation.
TypeCheck<T>
A type-guard function for type T.
### <a id="ObjectWrapper"></a>ObjectWrapper
Abstract base class that wraps an object and provides typed access to it.
T extends EmptyObject = EmptyObject
new ObjectWrapper<T>(obj): ObjectWrapper<T>;
T
ObjectWrapper<T>
readonly obj: T;
get protected stringKeyObj(): StringKeyObject;
### <a id="ValidatorBase"></a>ValidatorBase
Abstract base class for validators that wraps a partial object and provides a validation method.
ObjectWrapper<Partial<T>>T extends EmptyObject = AnyObject
Validator<T>new ValidatorBase<T>(obj): ValidatorBase<T>;
T
ValidatorBase<T>
readonly obj: T;
get protected stringKeyObj(): StringKeyObject;
abstract validate(payload): Promisable<Error[]>;
T
Promisable<Error[]>
### functions
### <a id="createDeepMerge"></a>createDeepMerge
function createDeepMerge(options): <T>(...objects) => MergeAll<T>;
Creates a deep merge function with the specified options.
MergeOptions
Options for merging.
A deep merge function configured for the specified options.
<T>(...objects) => MergeAll<T>
### <a id="omitBy"></a>omitBy
function omitBy<T>(
obj,
predicate,
maxDepth?): Partial<T>;
Creates a new object excluding properties that satisfy the predicate, with optional recursive depth.
T extends object
T
The source object to omit properties from.
A function that returns true for properties to exclude.
number = 1
Maximum recursion depth for nested objects.
Partial<T>
A partial copy of the object without matching properties.
### <a id="omitByPrefix"></a>omitByPrefix
function omitByPrefix<T, P>(
payload,
prefix,
maxDepth?): DeepOmitStartsWith<T, P>;
Omits all properties whose keys start with the given prefix, recursively through nested objects.
T extends object
P extends string
T
The source object.
P
The string prefix to match keys against.
number = 100
Maximum recursion depth.
DeepOmitStartsWith<T, P>
A new object without properties that have matching prefixed keys.
### <a id="pickBy"></a>pickBy
function pickBy<T>(
obj,
predicate,
maxDepth?): Partial<T>;
Creates a new object containing only the properties that satisfy the predicate, with optional recursive depth.
T extends object
T
The source object to pick properties from.
A function that returns true for properties to include.
number = 1
Maximum recursion depth for nested objects.
Partial<T>
A partial copy of the object with only matching properties.
### <a id="pickByPrefix"></a>pickByPrefix
function pickByPrefix<T, P>(
payload,
prefix,
maxDepth?): DeepPickStartsWith<T, P>;
Picks all properties whose keys start with the given prefix, recursively through nested objects.
T extends object
P extends string
T
The source object.
P
The string prefix to match keys against.
number = 100
Maximum recursion depth.
DeepPickStartsWith<T, P>
A new object containing only properties with matching prefixed keys.
### <a id="removeFields"></a>removeFields
function removeFields<T, K>(obj, fields): Omit<T, K>;
Returns a shallow copy of the object with the specified fields removed.
T extends object
K extends string | number | symbol
T
The source object.
K[]
An array of keys to remove.
Omit<T, K>
A new object without the specified fields.
### <a id="toSafeJson"></a>toSafeJson
function toSafeJson(value, maxDepth?): unknown;
Converts a value to a JSON-safe representation, handling circular references and non-serializable types.
unknown
The value to convert.
number = 3
Maximum recursion depth.
unknown
A JSON-safe value.
### <a id="toSafeJsonArray"></a>toSafeJsonArray
function toSafeJsonArray(
value,
cycleList?,
maxDepth?): unknown[];
Converts an array to a JSON-safe array, handling circular references and depth limits.
unknown[]
The array to convert.
unknown[]
Tracks visited objects to detect circular references.
number = 3
Maximum recursion depth before truncating.
unknown[]
A JSON-safe array representation.
### <a id="toSafeJsonObject"></a>toSafeJsonObject
function toSafeJsonObject(
value,
cycleList?,
maxDepth?): JsonObject;
Converts an object to a JSON-safe object, handling circular references and depth limits.
object
The object to convert.
unknown[]
Tracks visited objects to detect circular references.
number = 3
Maximum recursion depth before truncating.
A JSON-safe object representation.
### <a id="toSafeJsonString"></a>toSafeJsonString
function toSafeJsonString(value, maxDepth?): string;
Converts a value to a pretty-printed JSON string, safely handling circular references and non-JSON types.
unknown
The value to serialize.
number = 3
Maximum recursion depth.
string
A formatted JSON string.
### <a id="toSafeJsonValue"></a>toSafeJsonValue
function toSafeJsonValue(
value,
cycleList?,
maxDepth?): unknown;
Converts an unknown value to a JSON-safe value, replacing circular references with '[Circular]' and non-JSON types with descriptive placeholder strings.
unknown
The value to convert.
unknown[]
Tracks visited objects to detect circular references.
number = 3
Maximum recursion depth before truncating with '[MaxDepth]'.
unknown
A JSON-safe representation of the value.
### interfaces
### <a id="AsTypeFunction"></a>AsTypeFunction
A type-narrowing function that attempts to cast a value to T, with optional assertion and configuration overloads.
T extends AnyNonPromise = AnyNonPromise
AsTypeFunction<TType>(value): TType | undefined;
A type-narrowing function that attempts to cast a value to T, with optional assertion and configuration overloads.
TType extends AnyNonPromise
AnyNonPromise
TType | undefined
AsTypeFunction<TType>(value, config): TType;
A type-narrowing function that attempts to cast a value to T, with optional assertion and configuration overloads.
TType extends AnyNonPromise
AnyNonPromise
TType
AsTypeFunction<TType>(value, config): TType | undefined;
A type-narrowing function that attempts to cast a value to T, with optional assertion and configuration overloads.
TType extends AnyNonPromise
AnyNonPromise
| TypeCheckConfig
| TypeCheckOptionalConfig
TType | undefined
AsTypeFunction<TType>(value, assert): TType | undefined;
A type-narrowing function that attempts to cast a value to T, with optional assertion and configuration overloads.
TType extends AnyNonPromise
AnyNonPromise
StringOrAlertFunction<TType>
TType | undefined
AsTypeFunction<TType>(
value,
assert,
config): TType;
A type-narrowing function that attempts to cast a value to T, with optional assertion and configuration overloads.
TType extends AnyNonPromise
AnyNonPromise
StringOrAlertFunction<TType>
TType
AsTypeFunction<TType>(
value,
assert,
config): TType | undefined;
A type-narrowing function that attempts to cast a value to T, with optional assertion and configuration overloads.
TType extends AnyNonPromise
AnyNonPromise
StringOrAlertFunction<TType>
| TypeCheckConfig
| TypeCheckOptionalConfig
TType | undefined
### <a id="ObjectTypeConfig"></a>ObjectTypeConfig
Configuration options for object type checking.
optional log?: boolean | Logger;
### <a id="TypeCheck"></a>TypeCheck
A type guard function that checks whether a value conforms to type T, with optional configuration.
T extends TypedValue
TypeCheck(obj): obj is T;
A type guard function that checks whether a value conforms to type T, with optional configuration.
AnyNonPromise
obj is T
TypeCheck(obj, config): obj is T;
A type guard function that checks whether a value conforms to type T, with optional configuration.
AnyNonPromise
obj is T
TypeCheck(obj, config): obj is T;
A type guard function that checks whether a value conforms to type T, with optional configuration.
AnyNonPromise
number | TypeCheckConfig | undefined
obj is T
### <a id="TypeCheckConfig"></a>TypeCheckConfig
Configuration options for type check functions, with optional logging.
optional log?: boolean | Logger;
### <a id="TypeCheckOptionalConfig"></a>TypeCheckOptionalConfig
Type check configuration that marks the value as optional, returning undefined on failure.
optional log?: boolean | Logger;
required: false;
### <a id="TypeCheckRequiredConfig"></a>TypeCheckRequiredConfig
Type check configuration that marks the value as required, causing assertions on failure.
optional log?: boolean | Logger;
required: true;
### <a id="Validator"></a>Validator
Interface for validating objects and returning any errors found.
T extends EmptyObject = AnyObject
validate(payload): Promisable<Error[]>;
T
Promisable<Error[]>
### type-aliases
### <a id="AnyObject"></a>AnyObject
type AnyObject = EmptyObject & Partial<Record<TypedKey, unknown>>;
Any object, which means that it does not enforce the set of fields that it has. Extending from AnyObject will result in a type that includes the universal set of field names
### <a id="AsOptionalTypeFunction"></a>AsOptionalTypeFunction
type AsOptionalTypeFunction<T> = <TType>(value) => TType | undefined;
A simplified type-narrowing function that returns T or undefined, without assertion support.
T extends AnyNonPromise = AnyNonPromise
TType extends T
AnyNonPromise
TType | undefined
### <a id="Compare"></a>Compare
type Compare<T> = (a, b) => number;
A comparator function that returns a negative number if a < b, zero if a == b, and a positive number if a > b.
T
T
T
number
### <a id="DeepOmitStartsWith"></a>DeepOmitStartsWith
type DeepOmitStartsWith<T, Prefix> = T extends infer U[] ? DeepOmitStartsWith<U, Prefix>[] : T extends object ? { [K in keyof T as K extends string ? K extends `${Prefix}${string}` ? never : K : K]: DeepOmitStartsWith<T[K], Prefix> } : T;
Recursively omits keys that start with the given prefix, including in nested objects and arrays.
T
Prefix extends string
### <a id="DeepPickStartsWith"></a>DeepPickStartsWith
type DeepPickStartsWith<T, Prefix> = T extends infer U[] ? DeepPickStartsWith<U, Prefix>[] : T extends object ? { [K in keyof T as K extends string ? K extends `${Prefix}${string}` ? K : never : K]: DeepPickStartsWith<T[K], Prefix> } : T;
Recursively picks only the keys that start with the given prefix, including in nested objects and arrays.
T
Prefix extends string
### <a id="DeepRestrictToJson"></a>DeepRestrictToJson
type DeepRestrictToJson<T> = { [K in keyof T as K extends string ? K : never]: T[K] extends (infer U)[] ? DeepRestrictToJson<U>[] : T[K] extends object ? DeepRestrictToJson<T[K]> : T[K] extends JsonValue ? T[K] : never };
Recursively restricts an object type to only JSON-compatible values, excluding non-serializable types.
T
### <a id="DeepRestrictToStringKeys"></a>DeepRestrictToStringKeys
type DeepRestrictToStringKeys<T> = { [K in keyof T as K extends string ? K : never]: T[K] extends (infer U)[] ? DeepRestrictToStringKeys<U>[] : T[K] extends object ? DeepRestrictToStringKeys<T[K]> : T[K] };
Recursively removes all non-string keys from an object type, including in nested objects and arrays.
T
### <a id="EmptyObject"></a>EmptyObject
type EmptyObject<T> = Exclude<{ [K in keyof T]?: never }, unknown[] | ((...args) => unknown) | null>;
An empty object, which means that it does enforce the set of field names, defaulting to an empty set until extended from, which then adds only those additional fields
T extends object = object
### <a id="JsonArray"></a>JsonArray
type JsonArray = z.infer<typeof JsonArrayZod>;
A JSON array containing JSON values.
### <a id="JsonObject"></a>JsonObject
type JsonObject = z.infer<typeof JsonObjectZod>;
A JSON object with string keys and JSON values.
### <a id="JsonValue"></a>JsonValue
type JsonValue = z.infer<typeof JsonValueZod>;
A recursive JSON value: string, number, boolean, null, array, or object.
### <a id="OmitByPredicate"></a>OmitByPredicate
type OmitByPredicate<T> = (value, key) => boolean;
A predicate function used to determine which properties to omit from an object.
T extends EmptyObject = Record<string, unknown>
T[keyof T]
keyof T
boolean
### <a id="OmitStartsWith"></a>OmitStartsWith
type OmitStartsWith<T, Prefix> = { [K in keyof T as K extends `${Prefix}${string}` ? never : K]: T[K] };
Omits the keys of T that start with the given prefix.
T
Prefix extends string
### <a id="Optional"></a>Optional
type Optional<T, F> = Omit<T, F> & Partial<Pick<T, F>>;
Makes the specified fields of T optional while keeping the rest required.
T extends object
F extends keyof T
### <a id="Override"></a>Override
type Override<T1, T2> = Omit<T1, keyof T2> & T2;
Overrides properties of T1 with those from T2.
T1
T2
### <a id="PartialRecord"></a>PartialRecord
type PartialRecord<K, T> = Partial<Record<K, T>>;
K extends keyof any
T
use Partial<Record<>> instead
### <a id="PickByPredicate"></a>PickByPredicate
type PickByPredicate<T> = (value, key) => boolean;
A predicate function used to determine which properties to pick from an object.
T extends EmptyObject = Record<string, unknown>
T[keyof T]
keyof T
boolean
### <a id="PickStartsWith"></a>PickStartsWith
type PickStartsWith<T, Prefix> = { [K in keyof T as K extends `${Prefix}${string}` ? K : never]: T[K] };
Picks only the keys of T that start with the given prefix.
T
Prefix extends string
### <a id="Simplify"></a>Simplify
type Simplify<T> = { [K in keyof T]: T[K] } & object;
Flattens an intersection or complex mapped type into a single object type for better readability.
T
### <a id="StringKeyObject"></a>StringKeyObject
type StringKeyObject<T> = Record<string, T>;
An object type with string keys and values of type T.
T = unknown
### <a id="StringOrAlertFunction"></a>StringOrAlertFunction
type StringOrAlertFunction<T> = string | AssertExMessageFunc<T>;
A string message or function that produces an assertion error message for a failed type check.
T extends AnyNonPromise
### <a id="WithAdditional"></a>WithAdditional
type WithAdditional<T, TAdditional> = TAdditional extends EmptyObject ? T & TAdditional : T;
Intersects T with TAdditional if TAdditional is an object, otherwise returns T unchanged.
T extends EmptyObject | void
TAdditional extends EmptyObject | void = void
### variables
### <a id="AsObjectFactory"></a>AsObjectFactory
const AsObjectFactory: object;
Factory for creating type-narrowing functions for TypedObject types.
create: <T>(typeCheck) => AsTypeFunction<T>;
T extends TypedObject
TypeCheck<T>
createOptional: <T>(typeCheck) => (value) => T | undefined;
T extends TypedObject
TypeCheck<T>
(value) => T | undefined
### <a id="AsTypeFactory"></a>AsTypeFactory
const AsTypeFactory: object;
Factory for creating type-narrowing 'as' functions that cast a value to T or return undefined. Supports optional assertion messages and configuration for required/optional behavior.
create: <T>(typeCheck) => AsTypeFunction<T>;
T extends AnyNonPromise
TypeCheck<T>
createOptional: <T>(typeCheck) => (value) => T | undefined;
T extends AnyNonPromise
TypeCheck<T>
(value) => T | undefined
### <a id="JsonObjectZod"></a>JsonObjectZod
const JsonObjectZod: ZodRecord<ZodString, ZodType<unknown, unknown, $ZodTypeInternals<unknown, unknown>>>;
Zod schema for a JSON object with string keys and recursive JSON values.
### <a id="asAnyObject"></a>asAnyObject
const asAnyObject: AsTypeFunction<AnyObject>;
Type-narrowing function that casts a value to AnyObject if it is a plain object, or returns undefined.
### <a id="asJsonArray"></a>asJsonArray
const asJsonArray: {
<T> (value): T & unknown[] | undefined;
<T> (value, assert): T & unknown[];
};
Casts a value to JsonArray or returns undefined if it does not conform.
<T>(value): T & unknown[] | undefined;
T
T
T & unknown[] | undefined
<T>(value, assert): T & unknown[];
T
T
ZodFactoryConfig
T & unknown[]
### <a id="asJsonObject"></a>asJsonObject
const asJsonObject: {
<T> (value): T & Record<string, unknown> | undefined;
<T> (value, assert): T & Record<string, unknown>;
};
Casts a value to JsonObject or returns undefined if it does not conform.
<T>(value): T & Record<string, unknown> | undefined;
T
T
T & Record<string, unknown> | undefined
<T>(value, assert): T & Record<string, unknown>;
T
T
ZodFactoryConfig
T & Record<string, unknown>
### <a id="asJsonValue"></a>asJsonValue
const asJsonValue: {
<T> (value): T | undefined;
<T> (value, assert): T;
};
Casts a value to JsonValue or returns undefined if it does not conform.
<T>(value): T | undefined;
T
T
T | undefined
<T>(value, assert): T;
T
T
ZodFactoryConfig
T
### <a id="deepMerge"></a>deepMerge
const deepMerge: <T>(...objects) => MergeAll<T>;
Deeply merges multiple objects into a new object.
T extends AnyObject[]
...T
Multiple objects to merge deeply. The function merges properties from all objects into a new object. If a property exists in multiple objects, the last object's value will be used. If a property is an object, it will be merged recursively. If a property is an array, it will be overwritten by the last object's value. If a property is a primitive value, it will be overwritten by the last object's value. If a property is undefined in the source, it will be skipped. If a property is a symbol, it will be merged as well.
MergeAll<T>
A new object with the merged properties.
### <a id="isJsonArray"></a>isJsonArray
const isJsonArray: <T>(value) => value is T & unknown[];
Type guard that checks if a value is a valid JSON array.
T
T
value is T & unknown[]
### <a id="isJsonObject"></a>isJsonObject
const isJsonObject: <T>(value) => value is T & Record<string, unknown>;
Type guard that checks if a value is a valid JSON object.
T
T
value is T & Record<string, unknown>
### <a id="isJsonValue"></a>isJsonValue
const isJsonValue: <T>(value) => value is T;
Type guard that checks if a value is a valid JSON value.
T
T
value is T
### <a id="toJsonArray"></a>toJsonArray
const toJsonArray: {
<T> (value): T & unknown[] | undefined;
<T> (value, assert): T & unknown[];
};
Parses a value into a JsonArray, throwing if it does not conform.
<T>(value): T & unknown[] | undefined;
T
T
T & unknown[] | undefined
<T>(value, assert): T & unknown[];
T
T
ZodFactoryConfig
T & unknown[]
### <a id="toJsonObject"></a>toJsonObject
const toJsonObject: {
<T> (value): T & Record<string, unknown> | undefined;
<T> (value, assert): T & Record<string, unknown>;
};
Parses a value into a JsonObject, throwing if it does not conform.
<T>(value): T & Record<string, unknown> | undefined;
T
T
T & Record<string, unknown> | undefined
<T>(value, assert): T & Record<string, unknown>;
T
T
ZodFactoryConfig
T & Record<string, unknown>
### <a id="toJsonValue"></a>toJsonValue
const toJsonValue: {
<T> (value): T | undefined;
<T> (value, assert): T;
};
Parses a value into a JsonValue, throwing if it does not conform.
<T>(value): T | undefined;
T
T
T | undefined
<T>(value, assert): T;
T
T
ZodFactoryConfig
T
FAQs
Base functionality used throughout XY Labs TypeScript/JavaScript libraries
The npm package @xylabs/object receives a total of 4,019 weekly downloads. As such, @xylabs/object popularity was classified as popular.
We found that @xylabs/object demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 5 open source maintainers collaborating on the project.
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