utilitypes/dist/index.d.ts

A collection of utility types for TypeScript

// Copyright 2021-present the utilitypes authors. All rights reserved. MIT license.
/**
 * Returns a record type with exclusive properties.
 * @typeParam T - Any Record types
 * @typeParam U - Any Record types
 * @returns Record type with { property?: undefined } for properties that do not match each of `T` and `U`
 *
 * @example
 * ```ts
 * Exclusive<{ a: string }, { a: number }>
 * // ({ a: string } & { b?: undefined }) |
 * // ({ b: number } & { a?: undefined })
 * ```
 *
 * @beta
 */
type Exclusive<T extends Record<PropertyKey, unknown>, U extends Record<PropertyKey, unknown>> = (T & {
    [k in Exclude<keyof U, keyof T>]?: never;
}) | (U & {
    [k in Exclude<keyof T, keyof U>]?: never;
});
export type { Exclusive };
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