typescript-telegram-bot-api/dist/utils.d.ts

Telegram Bot API wrapper for Node.js written in TypeScript

/**
 * A TypeScript utility type that enforces only one or none specified properties of a given type to be present.
 */
export type AtMostOne<T, Keys extends keyof T = keyof T> = {
    [K in Keys]: {
        [P in K]: T[K];
    } & Partial<Record<Exclude<Keys, K>, never>>;
}[Keys];
/**
 * A TypeScript utility type that enforces exactly one specified property of a given type to be present.
 */
export type ExactlyOne<T, Keys extends keyof T = keyof T> = {
    [K in Keys]: {
        [P in K]-?: T[P];
    } & {
        [P in Exclude<Keys, K>]?: never;
    } & Omit<T, Keys>;
}[Keys];