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/// <reference types="node" />
import { EventEmitter } from 'events';
declare function once<T>(emitter: EventEmitter, name: string): once.CancelablePromise<T>;
declare namespace once {
interface CancelFunction {
(): void;
}
interface CancelablePromise<T> extends Promise<T> {
cancel: CancelFunction;
}
type CancellablePromise<T> = CancelablePromise<T>;
function spread<T extends any[]>(emitter: EventEmitter, name: string): once.CancelablePromise<T>;
}
export = once;
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