lib: implement queueMicrotask

PR-URL: https://github.com/nodejs/node/pull/22951
Refs: https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-queuemicrotask
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/test/parallel/test-queue-microtask.js b/test/parallel/test-queue-microtask.js
new file mode 100644
index 0000000000..ea9b88c71e
--- /dev/null
+++ b/test/parallel/test-queue-microtask.js
@@ -0,0 +1,60 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+
+assert.strictEqual(typeof queueMicrotask, 'function');
+
+[
+  undefined,
+  null,
+  0,
+  'x = 5',
+].forEach((t) => {
+  assert.throws(common.mustCall(() => {
+    queueMicrotask(t);
+  }), {
+    code: 'ERR_INVALID_ARG_TYPE',
+  });
+});
+
+{
+  let called = false;
+  queueMicrotask(common.mustCall(() => {
+    called = true;
+  }));
+  assert.strictEqual(called, false);
+}
+
+queueMicrotask(common.mustCall(function() {
+  assert.strictEqual(arguments.length, 0);
+}), 'x', 'y');
+
+{
+  const q = [];
+  Promise.resolve().then(() => q.push('a'));
+  queueMicrotask(common.mustCall(() => q.push('b')));
+  Promise.reject().catch(() => q.push('c'));
+
+  queueMicrotask(common.mustCall(() => {
+    assert.deepStrictEqual(q, ['a', 'b', 'c']);
+  }));
+}
+
+const eq = [];
+process.on('error', (e) => {
+  eq.push(e);
+});
+
+process.on('exit', () => {
+  assert.strictEqual(eq.length, 2);
+  assert.strictEqual(eq[0].message, 'E1');
+  assert.strictEqual(
+    eq[1].message, 'Class constructor  cannot be invoked without \'new\'');
+});
+
+queueMicrotask(common.mustCall(() => {
+  throw new Error('E1');
+}));
+
+queueMicrotask(class {});