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kitabcitab/node_modules/core-js-pure/internals/microtask.js

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+var global = require('../internals/global');
+var bind = require('../internals/function-bind-context');
+var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
+var macrotask = require('../internals/task').set;
+var IS_IOS = require('../internals/engine-is-ios');
+var IS_IOS_PEBBLE = require('../internals/engine-is-ios-pebble');
+var IS_WEBOS_WEBKIT = require('../internals/engine-is-webos-webkit');
+var IS_NODE = require('../internals/engine-is-node');
+
+var MutationObserver = global.MutationObserver || global.WebKitMutationObserver;
+var document = global.document;
+var process = global.process;
+var Promise = global.Promise;
+// Node.js 11 shows ExperimentalWarning on getting `queueMicrotask`
+var queueMicrotaskDescriptor = getOwnPropertyDescriptor(global, 'queueMicrotask');
+var queueMicrotask = queueMicrotaskDescriptor && queueMicrotaskDescriptor.value;
+
+var flush, head, last, notify, toggle, node, promise, then;
+
+// modern engines have queueMicrotask method
+if (!queueMicrotask) {
+  flush = function () {
+    var parent, fn;
+    if (IS_NODE && (parent = process.domain)) parent.exit();
+    while (head) {
+      fn = head.fn;
+      head = head.next;
+      try {
+        fn();
+      } catch (error) {
+        if (head) notify();
+        else last = undefined;
+        throw error;
+      }
+    } last = undefined;
+    if (parent) parent.enter();
+  };
+
+  // browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339
+  // also except WebOS Webkit https://github.com/zloirock/core-js/issues/898
+  if (!IS_IOS && !IS_NODE && !IS_WEBOS_WEBKIT && MutationObserver && document) {
+    toggle = true;
+    node = document.createTextNode('');
+    new MutationObserver(flush).observe(node, { characterData: true });
+    notify = function () {
+      node.data = toggle = !toggle;
+    };
+  // environments with maybe non-completely correct, but existent Promise
+  } else if (!IS_IOS_PEBBLE && Promise && Promise.resolve) {
+    // Promise.resolve without an argument throws an error in LG WebOS 2
+    promise = Promise.resolve(undefined);
+    // workaround of WebKit ~ iOS Safari 10.1 bug
+    promise.constructor = Promise;
+    then = bind(promise.then, promise);
+    notify = function () {
+      then(flush);
+    };
+  // Node.js without promises
+  } else if (IS_NODE) {
+    notify = function () {
+      process.nextTick(flush);
+    };
+  // for other environments - macrotask based on:
+  // - setImmediate
+  // - MessageChannel
+  // - window.postMessage
+  // - onreadystatechange
+  // - setTimeout
+  } else {
+    // strange IE + webpack dev server bug - use .bind(global)
+    macrotask = bind(macrotask, global);
+    notify = function () {
+      macrotask(flush);
+    };
+  }
+}
+
+module.exports = queueMicrotask || function (fn) {
+  var task = { fn: fn, next: undefined };
+  if (last) last.next = task;
+  if (!head) {
+    head = task;
+    notify();
+  } last = task;
+};