/**
 * Promise Utilities
 */
/** A deferred promise — resolve/reject from outside. */
export interface Deferred<T> {
    promise: Promise<T>;
    resolve: (value: T) => void;
    reject: (reason?: unknown) => void;
}
/** Create a deferred promise. */
export declare function createDeferred<T>(): Deferred<T>;
/** Sleep for `ms` milliseconds. */
export declare function sleep(ms: number): Promise<void>;
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