| 1 | module.exports =
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| 2 | typeof setImmediate === "function"
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| 3 | ? setImmediate
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| 4 | : (function() {
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| 5 | var queue = [];
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| 6 | var win = window;
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| 7 | var msg = "" + Math.random();
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| 8 | win.addEventListener("message", function(ev) {
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| 9 | if (ev.data === msg) {
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| 10 | var callbacks = queue;
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| 11 | queue = [];
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| 12 | for (var i = 0; i < callbacks.length; i++) {
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| 13 | callbacks[i]();
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| 14 | }
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| 15 | }
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| 16 | });
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| 17 | return function(callback) {
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| 18 | if (queue.push(callback) === 1) {
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| 19 | win.postMessage(msg, "*");
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| 20 | }
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| 21 | };
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| 22 | })();
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