type-fns/dist/types/PickOne.d.ts

A set of types, type checks, and type guards for simpler, safer, and easier to read code.

/**
 * creates a type which allows specifying one, and only one, key of an object
 *
 * ref:
 * - https://stackoverflow.com/a/56933182/3068233
 */
export type PickOne<T> = {
    [P in keyof T]: Record<P, T[P]> & Partial<Record<Exclude<keyof T, P>, undefined>>;
}[keyof T];