From 70f01242f11f88706f40086654de6819539dbad4 Mon Sep 17 00:00:00 2001
From: Spencer Elliott <me@elliottsj.com>
Date: Sat, 17 Oct 2015 17:46:42 -0400
Subject: [PATCH] Use an EventEmitter instead of `window.addEventListener`

---
 hot/dev-server.js      | 22 ++++++++--------------
 hot/emitter.js         |  2 ++
 hot/only-dev-server.js | 22 ++++++++--------------
 3 files changed, 18 insertions(+), 28 deletions(-)
 create mode 100644 hot/emitter.js

diff --git a/hot/dev-server.js b/hot/dev-server.js
index a84690346..48a151b0c 100644
--- a/hot/dev-server.js
+++ b/hot/dev-server.js
@@ -4,9 +4,9 @@
 */
 /*globals window __webpack_hash__ */
 if(module.hot) {
-	var lastData;
+	var lastHash;
 	var upToDate = function upToDate() {
-		return lastData.indexOf(__webpack_hash__) >= 0;
+		return lastHash.indexOf(__webpack_hash__) >= 0;
 	};
 	var check = function check() {
 		module.hot.check(true).then(function(updatedModules) {
@@ -40,18 +40,12 @@ if(module.hot) {
 			}
 		});
 	};
-	var addEventListener = window.addEventListener ? function(eventName, listener) {
-		window.addEventListener(eventName, listener, false);
-	} : function(eventName, listener) {
-		window.attachEvent("on" + eventName, listener);
-	};
-	addEventListener("message", function(event) {
-		if(typeof event.data === "string" && event.data.indexOf("webpackHotUpdate") === 0) {
-			lastData = event.data;
-			if(!upToDate() && module.hot.status() === "idle") {
-				console.log("[HMR] Checking for updates on the server...");
-				check();
-			}
+	var hotEmitter = require("./emitter");
+	hotEmitter.on("webpackHotUpdate", function(currentHash) {
+		lastHash = currentHash;
+		if(!upToDate() && module.hot.status() === "idle") {
+			console.log("[HMR] Checking for updates on the server...");
+			check();
 		}
 	});
 	console.log("[HMR] Waiting for update signal from WDS...");
diff --git a/hot/emitter.js b/hot/emitter.js
new file mode 100644
index 000000000..05e0fbe09
--- /dev/null
+++ b/hot/emitter.js
@@ -0,0 +1,2 @@
+var EventEmitter = require("events");
+module.exports = new EventEmitter();
diff --git a/hot/only-dev-server.js b/hot/only-dev-server.js
index f2aff7aa5..30e00b78f 100644
--- a/hot/only-dev-server.js
+++ b/hot/only-dev-server.js
@@ -4,9 +4,9 @@
 */
 /*globals window __webpack_hash__ */
 if(module.hot) {
-	var lastData;
+	var lastHash;
 	var upToDate = function upToDate() {
-		return lastData.indexOf(__webpack_hash__) >= 0;
+		return lastHash.indexOf(__webpack_hash__) >= 0;
 	};
 	var check = function check() {
 		module.hot.check().then(function(updatedModules) {
@@ -54,18 +54,12 @@ if(module.hot) {
 			}
 		});
 	};
-	var addEventListener = window.addEventListener ? function(eventName, listener) {
-		window.addEventListener(eventName, listener, false);
-	} : function(eventName, listener) {
-		window.attachEvent("on" + eventName, listener);
-	};
-	addEventListener("message", function(event) {
-		if(typeof event.data === "string" && event.data.indexOf("webpackHotUpdate") === 0) {
-			lastData = event.data;
-			if(!upToDate() && module.hot.status() === "idle") {
-				console.log("[HMR] Checking for updates on the server...");
-				check();
-			}
+	var hotEmitter = require("./emitter");
+	hotEmitter.on("webpackHotUpdate", function(currentHash) {
+		lastHash = currentHash;
+		if(!upToDate() && module.hot.status() === "idle") {
+			console.log("[HMR] Checking for updates on the server...");
+			check();
 		}
 	});
 	console.log("[HMR] Waiting for update signal from WDS...");