/**
 * Waits for an asynchronous condition to be achieved.
 * NOTE: This legacy utility is not a good replacement for proper angular techniques
 *
 * @param condition The function to determine if the desired state was achieved.
 * @param errorMessage The message to fail the Jasmine test case with.
 * @param duration The duration in milliseconds (ms) to wait for the desired condition.
 */
export declare function waitAsync(condition: () => boolean, errorMessage: string, duration?: number): Promise<void>;