/**
 * Capability passed to cleanup callbacks that may need to initiate disposal of
 * their owner. The request is deliberately non-blocking: cleanup must finish
 * before the owner's external disposal barrier can settle.
 */
export interface CleanupControl {
    /**
     * Start disposal of the callback's owner without waiting on the cleanup
     * callback that made the request. External `dispose()` callers still await
     * the complete teardown and receive its failures.
     */
    requestDisposal(): void;
}
/** @internal */
export declare function createCleanupControl(startDisposal: () => Promise<unknown>): CleanupControl;
/** @internal */
export declare function createDeferred<T>(): {
    promise: Promise<T>;
    resolve: (value: T | PromiseLike<T>) => void;
    reject: (reason?: unknown) => void;
};