Type Alias Merge<Destination, Source>

Merge: EnforceOptional<
    SimpleMerge<PickIndexSignature<Destination>, PickIndexSignature<Source>> & SimpleMerge<
        OmitIndexSignature<Destination>,
        OmitIndexSignature<Source>,
    >,
>

Merge two types into a new type. Keys of the second type overrides keys of the first type.

Type Parameters

Destination
Source

Example

import type {Merge} from 'type-fest';

interface Foo {
	[x: string]: unknown;
	[x: number]: unknown;
	foo: string;
	bar: symbol;
}

type Bar = {
	[x: number]: number;
	[x: symbol]: unknown;
	bar: Date;
	baz: boolean;
};

export type FooBar = Merge<Foo, Bar>;
// => {
// 	[x: string]: unknown;
// 	[x: number]: number;
// 	[x: symbol]: unknown;
// 	foo: string;
// 	bar: Date;
// 	baz: boolean;
// }