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type-fest/source/merge.d.ts

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415 BTypeScriptView Raw

1import {Except} from './except';
2
3/**
4Merge two types into a new type. Keys of the second type overrides keys of the first type.
5
6@example
7```
8import {Merge} from 'type-fest';
9
10type Foo = {
11	a: number;
12	b: string;
13};
14
15type Bar = {
16	b: number;
17};
18
19const ab: Merge<Foo, Bar> = {a: 1, b: 2};
20```
21*/
22export type Merge<FirstType, SecondType> = Except<FirstType, Extract<keyof FirstType, keyof SecondType>> & SecondType;

1	`import {Except} from './except';`
2
3	`/**`
4	`Merge two types into a new type. Keys of the second type overrides keys of the first type.`
5
6	`@example`
7	```
8	`import {Merge} from 'type-fest';`
9
10	`type Foo = {`
11	`a: number;`
12	`b: string;`
13	`};`
14
15	`type Bar = {`
16	`b: number;`
17	`};`
18
19	`const ab: Merge<Foo, Bar> = {a: 1, b: 2};`
20	```
21	`*/`
22	`export type Merge<FirstType, SecondType> = Except<FirstType, Extract<keyof FirstType, keyof SecondType>> & SecondType;`