/**
 * Applies a callback to each item of `array` and wraps
 * the result in a `Promise.all`.
 *
 * @group Utils
 * @category Async
 * @example
 * ```
 * await all(sinks, sink => sink.close())
 * // :this: is syntactical sugar for:
 * await Promise.all(sinks.map(sink => sink.close()))
 * ```
 */
export declare function all<T>(array: T[], map: (item: T, index: number, array: T[]) => unknown): Promise<unknown[]>;
/**
 * Returns a promise that resolves in `ms` milliseconds.
 *
 * @group Utils
 * @category Async
 */
export declare function timeout(ms?: number): Promise<void>;
export declare function timeout<T>(ms: number, value: T, signal?: AbortSignal): Promise<T>;
/**
 * Returns a promise and a way to resolve or reject it.
 *
 * @group Utils
 * @category Async
 */
export declare function defer<T = void>(): {
    promise: Promise<T>;
    resolve: (value: T | PromiseLike<T>) => void;
    reject: (reason?: unknown) => void;
};
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