import { AsyncEventCancellationToken } from '../event/async.emitter';
export declare namespace CancellationToken {
    const None: AsyncEventCancellationToken;
}
export declare function delay(ms: number): Promise<unknown>;
/**
 * Use this function to ensure that all disposables are cleaned up at the end of each test in the current suite.
 *
 * Use `markAsSingleton` if disposable singletons are created lazily that are allowed to outlive the test.
 * Make sure that the singleton properly registers all child disposables so that they are excluded too.
 */
export declare function ensureNoDisposablesAreLeakedInTestSuite(): void;
export declare function throwIfDisposablesAreLeaked(body: () => void): void;