/**
 * Resolves after the given number of milliseconds, or immediately once
 * `signal` aborts — so cancelling mid-backoff doesn't have to wait out the
 * rest of the delay. Used to space out retry attempts.
 *
 * @public
 */
export declare function delay(ms: number, signal?: {
    readonly aborted: boolean;
    addEventListener?(type: 'abort', listener: () => void): void;
    removeEventListener?(type: 'abort', listener: () => void): void;
}): Promise<void>;
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