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export interface Defer<T = any> {

resolve(value?: T | PromiseLike<T>): void;

reject(reason?: any): void;

promise(): Promise<T>;

}

export function createDefer<T = any>(): Defer<T> {

const r: any = {};

const promise = new Promise<T>((resolve, reject) => {

r.resolve = resolve;

r.reject = reject;

});

r.promise = () => promise;

return r;

}