export type WaitForOptions = {
    timeout?: number;
    interval?: number;
};
/**
 * Wait for a condition to pass.
 * @param callback The function to run. Return truthy to stop the wait; anything else will retry
 * the callback. The truthy return value of the callback will be returned to the caller.
 * @returns A Promise resolving to the returned value from the callback
 */
export declare function waitFor<T>(callback: () => T | Promise<T>): Promise<T>;
/**
 * Wait for a condition to pass.
 * @param callback The function to run. Return truthy to stop the wait; anything else will retry
 * the callback. The truthy return value of the callback will be returned to the caller.
 * @param options Options for wait time/interval
 * @returns A Promise resolving to the returned value from the callback
 */
export declare function waitFor_internal<T>(callback: () => T | Promise<T>, options?: WaitForOptions): Promise<T>;