utility-types - npm Package Compare versions

Comparing version 3.10.0 to 3.11.0

dist/aliases-and-guards.d.ts

@@ -22,2 +22,12 @@ /**
 /**
+ * Nullish
+ * @desc Type representing [nullish values][https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#nullish-coalescing] in TypeScript: `null | undefined`
+ * @example
+ *   type Various = 'a' | 'b' | undefined;
+ *
+ *   // Expect: "a" | "b"
+ *   Exclude<Various, Nullish>;
+ */
+export declare type Nullish = null | undefined;
+/**
  * Tests for one of the [`Primitive`](https://developer.mozilla.org/en-US/docs/Glossary/Primitive) types using the JavaScript [`typeof`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof) operator
@@ -55,1 +65,14 @@ *
 export declare const isFalsy: (val: unknown) => val is Falsy;
+/**
+ * Tests for Nullish by simply comparing `val` for equality with `null`.
+ * @example
+ *   const consumer = (param: Nullish | string): string => {
+ *     if (isNullish(param)) {
+ *       // typeof param === Nullish
+ *       return String(param) + ' was Nullish';
+ *     }
+ *     // typeof param === string
+ *     return param.toString();
+ *   };
+ */
+export declare const isNullish: (val: unknown) => val is null | undefined;

dist/aliases-and-guards.js

@@ -51,2 +51,15 @@ "use strict";
 exports.isFalsy = function (val) { return !val; };
+/**
+ * Tests for Nullish by simply comparing `val` for equality with `null`.
+ * @example
+ *   const consumer = (param: Nullish | string): string => {
+ *     if (isNullish(param)) {
+ *       // typeof param === Nullish
+ *       return String(param) + ' was Nullish';
+ *     }
+ *     // typeof param === string
+ *     return param.toString();
+ *   };
+ */
+exports.isNullish = function (val) { return val == null; };
 //# sourceMappingURL=aliases-and-guards.js.map

dist/index.d.ts

@@ -9,3 +9,3 @@ /**
 export { Falsy, Falsy as Falsey, // deprecated in v3, backward compatibility until v4
-isFalsy, Primitive, isPrimitive, } from './aliases-and-guards';
+isFalsy, Nullish, isNullish, Primitive, isPrimitive, } from './aliases-and-guards';
 export { getReturnOfExpression } from './functional-helpers';

dist/index.js

@@ -10,2 +10,3 @@ "use strict";
 exports.isFalsy = aliases_and_guards_1.isFalsy;
+exports.isNullish = aliases_and_guards_1.isNullish;
 exports.isPrimitive = aliases_and_guards_1.isPrimitive;
@@ -12,0 +13,0 @@ // deprecated

dist/mapped-types.d.ts

@@ -404,10 +404,10 @@ import { Primitive } from './aliases-and-guards';
  */
-export declare type DeepPartial<T> = T extends Function ? T : T extends Array<infer U> ? _DeepPartialArray<U> : T extends object ? _DeepPartialObject<T> : T | undefined;
+export declare type DeepPartial<T> = {
+    [P in keyof T]?: _DeepPartial<T[P]>;
+};
 /** @private */
-export interface _DeepPartialArray<T> extends Array<DeepPartial<T>> {
+export declare type _DeepPartial<T> = T extends Function ? T : T extends Array<infer U> ? _DeepPartialArray<U> : T extends object ? DeepPartial<T> : T | undefined;
+/** @private */
+export interface _DeepPartialArray<T> extends Array<_DeepPartial<T>> {
 }
-/** @private */
-export declare type _DeepPartialObject<T> = {
-    [P in keyof T]?: DeepPartial<T[P]>;
-};
 /**
@@ -414,0 +414,0 @@ * Brand

dist/utility-types.d.ts

@@ -31,3 +31,3 @@ import { SetComplement, DeepReadonly } from './mapped-types';
  *
- *   // Expect: Readonly<{ name: string; age?: number | undefined; visible: boolean; }>
+ *   // Expect: Readonly<{ name: string; age: number; visible: boolean; }>
  *   type ReadOnlyProps = $ReadOnly<Props>;
@@ -97,3 +97,3 @@ */
  *   const add = (amount: number) => ({ type: 'ADD' as 'ADD', payload: amount });
- *   type AddAction = $Call<typeof returnOfIncrement>; // { type: 'ADD'; payload: number }
+ *   type AddAction = $Call<typeof add>; // { type: 'ADD'; payload: number }
  *
@@ -100,0 +100,0 @@ *   // Examples migrated from Flow docs

package.json

 {
   "name": "utility-types",
-  "version": "3.10.0",
+  "version": "3.11.0",
   "description": "Utility Types Collection for TypeScript",
@@ -5,0 +5,0 @@ "author": "Piotr Witek <[e-mail]> (http://piotrwitek.github.io)",

README.md

@@ -91,2 +91,4 @@ <div align="center">
 * [`isFalsy`](#isfalsy)
+* [`Nullish`](#nullish)
+* [`isNullish`](#isnullish)
 
@@ -209,2 +211,23 @@ ## Union operators
 
+### `Nullish`
+
+Type representing [nullish values](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#nullish-coalescing) in TypeScript: `null | undefined`
+
+[⇧ back to top](#table-of-contents)
+
+### `isNullish`
+
+```ts
+const consumer = (param: Nullish | string): string => {
+    if (isNullish(param)) {
+        // typeof param === Nullish
+        return String(param) + ' was Nullish';
+    }
+    // typeof param === string
+    return param.toString();
+};
+```
+
+[⇧ back to top](#table-of-contents)
+
 ### `SetIntersection<A, B>` (same as Extract)
@@ -618,3 +641,3 @@
 
-// Expect: { name: string; age: number; visible: boolean; other: string; }
+// Expect: { name: string; age: string; visible: boolean; other: string; }
 type ExtendedProps = Assign<Props, NewProps>;
@@ -958,3 +981,3 @@ ```
 
-// Expect: Readonly<{ name: string; age?: number | undefined; visible: boolean; }>
+// Expect: Readonly<{ name: string; age: number; visible: boolean; }>
 type ReadOnlyProps = $ReadOnly<Props>;
@@ -1043,2 +1066,4 @@ ```
 
+The built-in [`ReturnType`](https://www.typescriptlang.org/docs/handbook/utility-types.html#returntypetype) can be used to accomplish the same goal, although it may have some subtle differences.
+
 **Usage:**
@@ -1051,3 +1076,3 @@
 const add = (amount: number) => ({ type: 'ADD' as 'ADD', payload: amount });
-type AddAction = $Call<typeof returnOfIncrement>; // { type: 'ADD'; payload: number }
+type AddAction = $Call<typeof add>; // { type: 'ADD'; payload: number }
 
@@ -1054,0 +1079,0 @@ // Examples migrated from Flow docs

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64326

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873

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Number of lines in readme file

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