Function iteratorMixin

github-actions/saucelabs/set-saucelabs-env.js:4707–4763

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

            configurable: true,
            value: `${name} Iterator`
          },
          next: { writable: true, enumerable: true, configurable: true }
        });
        return function(target, kind) {
          return new FastIterableIterator(target, kind);
        };
      }
      function iteratorMixin(name, object, kInternalIterator, keyIndex = 0, valueIndex = 1) {
        const makeIterator = createIterator(name, kInternalIterator, keyIndex, valueIndex);
        const properties = {
          keys: {
            writable: true,
            enumerable: true,
            configurable: true,
            value: function keys() {
              webidl.brandCheck(this, object);
              return makeIterator(this, "key");
            }
          },
          values: {
            writable: true,
            enumerable: true,
            configurable: true,
            value: function values() {
              webidl.brandCheck(this, object);
              return makeIterator(this, "value");
            }
          },
          entries: {
            writable: true,
            enumerable: true,
            configurable: true,
            value: function entries() {
              webidl.brandCheck(this, object);
              return makeIterator(this, "key+value");
            }
          },
          forEach: {
            writable: true,
            enumerable: true,
            configurable: true,
            value: function forEach(callbackfn, thisArg = globalThis) {
              webidl.brandCheck(this, object);
              webidl.argumentLengthCheck(arguments, 1, `${name}.forEach`);
              if (typeof callbackfn !== "function") {
                throw new TypeError(
                  `Failed to execute 'forEach' on '${name}': parameter 1 is not of type 'Function'.`
                );
              }
              for (const { 0: key, 1: value } of makeIterator(this, "key+value")) {
                callbackfn.call(thisArg, value, key, this);
              }
            }
          }
        };
        return Object.defineProperties(object.prototype, __spreadProps(__spreadValues({}, properties), {
          [Symbol.iterator]: {
            writable: true,