type-plus
Version:
Provides additional types for TypeScript.
29 lines • 956 B
TypeScript
import type { AnyFunction } from '../function/any_function.js';
import type { ExtractFunction } from '../index.js';
import type { AnyRecord } from './AnyRecord.js';
import type { Properties } from './properties.js';
/**
* Creates a recursive partial type of type T.
*
* @example
* ```ts
* interface Foo {
* bar: number;
* baz: {
* qux: string
* }
* }
*
* type PartialFoo = RecursivePartial<Foo>
* // {
* // bar?: number | undefined;
* // baz?: {
* // qux?: string | undefined
* // } | undefined
* // }
* ```
*/
export type RecursivePartial<T> = {
[P in keyof T]?: T[P] extends (infer U)[] ? RecursivePartial<U>[] | undefined : T[P] extends infer F extends AnyFunction ? [keyof T[P]] extends [undefined] ? T[P] | undefined : ExtractFunction<F> & RecursivePartial<Properties<T[P]>> : T[P] extends AnyRecord ? RecursivePartial<T[P]> | undefined : T[P] | undefined;
};
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