/**
 * A utility method that makes it easier to use `event.waitUntil` with
 * async functions and return the result.
 *
 * @param event
 * @param asyncFn
 * @returns
 * @private
 */
export declare const waitUntil: <T = any>(event: ExtendableEvent, asyncFn: () => Promise<T>) => Promise<T>;
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