export declare const isDefined: <T>(t: T | undefined) => t is T;
export declare const promiseTimeout: (sleep: number) => Promise<void>;
export interface PromiseWithResolvers<T> {
    resolve: (t: T | PromiseLike<T>) => void;
    reject: (reason?: unknown) => void;
    promise: Promise<T>;
}
export declare function withResolvers<T = void>(): PromiseWithResolvers<T>;
export declare function withResolved<T = void>(t: T): PromiseWithResolvers<T>;
declare global {
    interface ReadableStream<R> {
        [Symbol.asyncIterator](): AsyncIterator<R>;
    }
}
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