type-plus
Version:
Provides additional types for TypeScript.
28 lines • 1.2 kB
TypeScript
import type { NeverType } from '../never/never_type.js';
import type { KeyTypes } from '../object/KeyTypes.js';
import type { Tail } from './tail.js';
/**
* ⚗️ *transform*
* 🔢 *customization*
*
* Gets the common property keys of the elements in tuple `T`.
*
* @example
* ```ts
* import { type TuplePlus } from 'type-plus'
*
* type R = TuplePlus.CommonPropKeys<[{ a: number }, { b: number }]> // never
* type R = TuplePlus.CommonPropKeys<[{ a: number, c: 1 }, { b: number, c: 2 }]> // 'c'
* ```
*
* @typeParam Options['caseNever'] Return type when `T` is `never`.
* Default to `never`.
*/
export type CommonPropKeys<T extends Record<KeyTypes, unknown>[], Options extends CommonPropKeys.Options = CommonPropKeys.DefaultOptions> = NeverType<T, Options['caseNever'], (T['length'] extends 0 ? never : (T['length'] extends 1 ? keyof T[0] : (T['length'] extends 2 ? keyof T[0] & keyof T[1] : keyof T[0] & keyof T[1] & CommonPropKeys<Tail<Tail<T>>>)))>;
export declare namespace CommonPropKeys {
interface Options extends NeverType.Options {
}
interface DefaultOptions extends NeverType.DefaultOptions {
}
}
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