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export class Deferred<T> implements Promise<T> {  // deno-lint-ignore ban-types  private _resolveSelf!: Function;  // deno-lint-ignore ban-types  private _rejectSelf!: Function;
  private fate: "resolved" | "unresolved";
  private state: "pending" | "fulfilled" | "rejected";
  private promise: Promise<T>;
  constructor() {    this.state = "pending";    this.fate = "unresolved";    this.promise = new Promise((resolve, reject) => {      this._resolveSelf = resolve;      this._rejectSelf = reject;    });  }
  // eslint-disable-next-line @typescript-eslint/no-unused-vars  finally(_onfinally?: (() => void) | null): Promise<T> {    throw new Error("Method not implemented.");  }
  public then<TResult1 = T, TResult2 = never>(    onfulfilled?:      | ((value: T) => TResult1 | PromiseLike<TResult1>)      | undefined      | null,    onrejected?:      // deno-lint-ignore no-explicit-any      | ((reason: any) => TResult2 | PromiseLike<TResult2>)      | undefined      | null,  ): Promise<TResult1 | TResult2> {    return this.promise.then(onfulfilled, onrejected);  }
  public catch<TResult = never>(    onrejected?:      // deno-lint-ignore no-explicit-any      | ((reason: any) => TResult | PromiseLike<TResult>)      | undefined      | null,  ): Promise<T | TResult> {    return this.promise.then(onrejected);  }
  public resolve(val?: T): void {    this.fate = "resolved";    this.state = "fulfilled";    this._resolveSelf(val);  }
  // deno-lint-ignore no-explicit-any  public reject(reason?: any): void {    this.fate = "resolved";    this.state = "rejected";    this._rejectSelf(reason);  }
  isResolved() {    return this.fate === "resolved";  }
  isPending() {    return this.state === "pending";  }
  isFulfilled() {    return this.state === "fulfilled";  }
  isRejected() {    return this.state === "rejected";  }
  [Symbol.toStringTag]: "Promise";}