lila/ui/@types/defer-promise/index.d.ts

interface Deferred<T> {
  promise: Promise<T>;
  resolve(value: T | PromiseLike<T>): void;
  resolve(): void; // only on Deferred<void>
  reject(reason?: any): void;
}

declare module 'defer-promise' {
  function defer<T>(): Deferred<T>;
  export = defer;
}