Function createIterator

deps/undici/undici.js:5613–5683

(name, kInternalIterator, keyIndex = 0, valueIndex = 1)

    __name(normalizeMethod, "normalizeMethod");
    var esIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()));
    function createIterator(name, kInternalIterator, keyIndex = 0, valueIndex = 1) {
      class FastIterableIterator {
        static {
          __name(this, "FastIterableIterator");
        }
        /** @type {any} */
        #target;
        /** @type {'key' | 'value' | 'key+value'} */
        #kind;
        /** @type {number} */
        #index;
        /**
         * @see https://webidl.spec.whatwg.org/#dfn-default-iterator-object
         * @param {unknown} target
         * @param {'key' | 'value' | 'key+value'} kind
         */
        constructor(target, kind) {
          this.#target = target;
          this.#kind = kind;
          this.#index = 0;
        }
        next() {
          if (typeof this !== "object" || this === null || !(#target in this)) {
            throw new TypeError(
              `'next' called on an object that does not implement interface ${name} Iterator.`
            );
          }
          const index = this.#index;
          const values = kInternalIterator(this.#target);
          const len = values.length;
          if (index >= len) {
            return {
              value: void 0,
              done: true
            };
          }
          const { [keyIndex]: key, [valueIndex]: value } = values[index];
          this.#index = index + 1;
          let result;
          switch (this.#kind) {
            case "key":
              result = key;
              break;
            case "value":
              result = value;
              break;
            case "key+value":
              result = [key, value];
              break;
          }
          return {
            value: result,
            done: false
          };
        }
      }
      delete FastIterableIterator.prototype.constructor;
      Object.setPrototypeOf(FastIterableIterator.prototype, esIteratorPrototype);