/**
 * Return a promise that resolves after `ms` milliseconds. If `abortSignal` is
 * already aborted, throws `abortSignal.reason` synchronously. If it aborts while
 * waiting, rejects with `abortSignal.reason`.
 *
 * Throws `RangeError` synchronously when `ms` is negative, non-finite, or
 * exceeds the portable JavaScript timer range.
 */
export declare function sleep(ms: number, abortSignal?: AbortSignal): Promise<void>;
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