const a = Object.getPrototypeOf(
  Object.getPrototypeOf(
    /* istanbul ignore next */
    async function* () {
    }
  ).prototype
);
class c {
  #t;
  #n;
  #r = !1;
  #e = void 0;
  constructor(e, t) {
    this.#t = e, this.#n = t;
  }
  next() {
    const e = () => this.#s();
    return this.#e = this.#e ? this.#e.then(e, e) : e(), this.#e;
  }
  return(e) {
    const t = () => this.#i(e);
    return this.#e ? this.#e.then(t, t) : t();
  }
  async #s() {
    if (this.#r)
      return {
        done: !0,
        value: void 0
      };
    let e;
    try {
      e = await this.#t.read();
    } catch (t) {
      throw this.#e = void 0, this.#r = !0, this.#t.releaseLock(), t;
    }
    return e.done && (this.#e = void 0, this.#r = !0, this.#t.releaseLock()), e;
  }
  async #i(e) {
    if (this.#r)
      return {
        done: !0,
        value: e
      };
    if (this.#r = !0, !this.#n) {
      const t = this.#t.cancel(e);
      return this.#t.releaseLock(), await t, {
        done: !0,
        value: e
      };
    }
    return this.#t.releaseLock(), {
      done: !0,
      value: e
    };
  }
}
const n = Symbol();
function i() {
  return this[n].next();
}
Object.defineProperty(i, "name", { value: "next" });
function o(r) {
  return this[n].return(r);
}
Object.defineProperty(o, "name", { value: "return" });
const u = Object.create(a, {
  next: {
    enumerable: !0,
    configurable: !0,
    writable: !0,
    value: i
  },
  return: {
    enumerable: !0,
    configurable: !0,
    writable: !0,
    value: o
  }
});
function h({ preventCancel: r = !1 } = {}) {
  const e = this.getReader(), t = new c(
    e,
    r
  ), s = Object.create(u);
  return s[n] = t, s;
}
export {
  h as asyncIterator
};