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Make the Iterator prototype have its own constructor #730

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Make the Iterator prototype have its own constructor #730

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232e545
Make the Iterator prototype have its own constructor
nikolaybotev Sep 13, 2024
a896fde
Remove redundant GeneratorFunctionPrototype
nikolaybotev Sep 13, 2024
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Make the Iterator prototype have its own constructor
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@nikolaybotev
nikolaybotev committed Sep 13, 2024
commit 232e54543273cd1d8c156b5d86f78298465ad819
12 changes: 10 additions & 2 deletions packages/runtime/runtime.js
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Original file line number Diff line number Diff line change
Expand Up @@ -86,12 +86,20 @@ var runtime = (function (exports) {

// This is a polyfill for %IteratorPrototype% for environments that
// don't natively support it.
var IteratorPrototype = {};
var getProto = Object.getPrototypeOf;
function Iterator() {
if (!IteratorPrototype.isPrototypeOf(this)) {
throw new TypeError("Iterator constructor called on non-iterator object");
}
if (getProto && getProto(this) === IteratorPrototype) {
throw new TypeError("Cannot instantiate abstract Iterator class");
}
}
var IteratorPrototype = Iterator.prototype;
define(IteratorPrototype, iteratorSymbol, function () {
return this;
});

var getProto = Object.getPrototypeOf;
var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
if (NativeIteratorPrototype &&
NativeIteratorPrototype !== Op &&
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6 changes: 6 additions & 0 deletions test/tests.es6.js
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Expand Up @@ -2625,6 +2625,9 @@ describe("generator function prototype", function() {

it("should follow the expected object model", function() {
var GeneratorFunctionPrototype = getProto(f);
var GeneratorPrototype = GeneratorFunctionPrototype.prototype;
var IteratorPrototype = getProto(GeneratorPrototype);
var Iterator = IteratorPrototype.constructor;
var GeneratorFunction = GeneratorFunctionPrototype.constructor;

assert.strictEqual(GeneratorFunction.name, 'GeneratorFunction');
Expand All @@ -2636,6 +2639,9 @@ describe("generator function prototype", function() {
getProto(f.prototype));
assert.strictEqual(getProto(GeneratorFunctionPrototype),
Function.prototype);
assert.notStrictEqual(IteratorPrototype, Object);
assert.throws(() => Iterator.call({}));
assert.throws(() => new Iterator());

if (typeof process === "undefined" ||
process.version.slice(1, 3) === "0.") {
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