Fixes marko-js-archive/async-writer#3 - flush is deprecated in Outgoi…

…ngMessage

runtime/loader.js

@@ -31,6 +31,26 @@ if (process.env.hasOwnProperty('MARKO_HOT_RELOAD')) {
 // enable browser-refresh
 require('../browser-refresh').enable();
 
+function fixFlush() {
+    try {
+        var OutgoingMessage = require('http').OutgoingMessage;
+        if (OutgoingMessage.prototype.flush && OutgoingMessage.prototype.flush.toString().indexOf('deprecated') !== -1) {
+            // Yes, we are monkey-patching http. This method should never have been added and it was introduced on
+            // the iojs fork. It was quickly deprecated and I'm 99% sure no one is actually using it.
+            // See:
+            // - https://github.com/marko-js/async-writer/issues/3
+            // - https://github.com/nodejs/node/issues/2920
+            //
+            // This method causes problems since marko looks for the flush method and calls it found.
+            // The `res.flush()` method is introduced by the [compression](https://www.npmjs.com/package/compression)
+            // middleware, but, otherwise, it should typically not exist.
+            delete require('http').OutgoingMessage.prototype.flush;
+        }
+    } catch(e) {}
+}
+
+fixFlush();
+
 function loadSource(templatePath, compiledSrc) {
     var templateModulePath = templatePath + '.js';