/**
 * A backport of Promiser.withResolvers
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/withResolvers
 */
export declare function promiseWithResolvers<A>(): PromiseAndResolvers<A>;
interface PromiseAndResolvers<A> {
    promise: Promise<A>;
    resolve: (value: A) => void;
    reject: (reason: any) => void;
}
/**
 * Waits for a function to return non-+undefined+ before returning.
 *
 * @param valueProvider - a function that will return a value that is not +undefined+ once the wait should be over
 * @param timeout     - the time to wait between two calls to +valueProvider+
 *
 * @returns       the value that was returned by +valueProvider+
 */
export declare function waitFor<T>(valueProvider: () => Promise<T | null | undefined>, timeout?: number): Promise<T | undefined>;
export {};
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