var global = require('../internals/global'); var fails = require('../internals/fails'); var bind = require('../internals/function-bind-context'); var html = require('../internals/html'); var createElement = require('../internals/document-create-element'); var IS_IOS = require('../internals/engine-is-ios'); var IS_NODE = require('../internals/engine-is-node'); var set = global.setImmediate; var clear = global.clearImmediate; var process = global.process; var MessageChannel = global.MessageChannel; var Dispatch = global.Dispatch; var counter = 0; var queue = {}; var ONREADYSTATECHANGE = 'onreadystatechange'; var location, defer, channel, port; try { // Deno throws a ReferenceError on `location` access without `--location` flag location = global.location; } catch (error) { /* empty */ } var run = function (id) { // eslint-disable-next-line no-prototype-builtins -- safe if (queue.hasOwnProperty(id)) { var fn = queue[id]; delete queue[id]; fn(); } }; var runner = function (id) { return function () { run(id); }; }; var listener = function (event) { run(event.data); }; var post = function (id) { // old engines have not location.origin global.postMessage(String(id), location.protocol + '//' + location.host); }; // Node.js 0.9+ & IE10+ has setImmediate, otherwise: if (!set || !clear) { set = function setImmediate(fn) { var args = []; var argumentsLength = arguments.length; var i = 1; while (argumentsLength > i) args.push(arguments[i++]); queue[++counter] = function () { // eslint-disable-next-line no-new-func -- spec requirement (typeof fn == 'function' ? fn : Function(fn)).apply(undefined, args); }; defer(counter); return counter; }; clear = function clearImmediate(id) { delete queue[id]; }; // Node.js 0.8- if (IS_NODE) { defer = function (id) { process.nextTick(runner(id)); }; // Sphere (JS game engine) Dispatch API } else if (Dispatch && Dispatch.now) { defer = function (id) { Dispatch.now(runner(id)); }; // Browsers with MessageChannel, includes WebWorkers // except iOS - https://github.com/zloirock/core-js/issues/624 } else if (MessageChannel && !IS_IOS) { channel = new MessageChannel(); port = channel.port2; channel.port1.onmessage = listener; defer = bind(port.postMessage, port, 1); // Browsers with postMessage, skip WebWorkers // IE8 has postMessage, but it's sync & typeof its postMessage is 'object' } else if ( global.addEventListener && typeof postMessage == 'function' && !global.importScripts && location && location.protocol !== 'file:' && !fails(post) ) { defer = post; global.addEventListener('message', listener, false); // IE8- } else if (ONREADYSTATECHANGE in createElement('script')) { defer = function (id) { html.appendChild(createElement('script'))[ONREADYSTATECHANGE] = function () { html.removeChild(this); run(id); }; }; // Rest old browsers } else { defer = function (id) { setTimeout(runner(id), 0); }; } } module.exports = { set: set, clear: clear };