Allow specifying EventStream

client.js

@@ -241,6 +241,9 @@ var subscribeAllHandler;
 function processMessage(obj) {
   switch (obj.action) {
     case 'building':
+      if (obj.name && options.name && obj.name !== options.name) {
+        return;
+      }
       if (options.log) {
         console.log(
           '[HMR] bundle ' +
@@ -250,6 +253,9 @@ function processMessage(obj) {
       }
       break;
     case 'built':
+      if (obj.name && options.name && obj.name !== options.name) {
+          return;
+      }
       if (options.log) {
         console.log(
           '[HMR] bundle ' +

middleware.js

@@ -1,4 +1,5 @@
 module.exports = webpackHotMiddleware;
+module.exports.createEventStream = createEventStream;
 
 var helpers = require('./helpers');
 var pathMatch = helpers.pathMatch;
@@ -12,7 +13,7 @@ function webpackHotMiddleware(compiler, opts) {
   opts.statsOptions =
     typeof opts.statsOptions == 'undefined' ? {} : opts.statsOptions;
 
-  var eventStream = createEventStream(opts.heartbeat);
+  var eventStream = opts.eventStream || createEventStream(opts.heartbeat);
   var latestStats = null;
   var closed = false;
 
@@ -27,7 +28,7 @@ function webpackHotMiddleware(compiler, opts) {
     if (closed) return;
     latestStats = null;
     if (opts.log) opts.log('webpack building...');
-    eventStream.publish({ action: 'building' });
+    eventStream.publish({ action: 'building', name: compiler.name });
   }
   function onDone(statsResult) {
     if (closed) return;

test/client-test.js

@@ -377,6 +377,7 @@ describe('client', function () {
           close: sinon.spy(),
         }),
       };
+      s.stub(console, 'log');
     });
     beforeEach(loadClient);
     it('should not trigger webpack if event obj name is different', function () {
@@ -409,6 +410,26 @@ describe('client', function () {
       );
       sinon.assert.notCalled(processUpdate);
     });
+    it('should not log building if obj name is different', function () {
+      var eventSource = window.EventSource.lastCall.returnValue;
+      eventSource.onmessage(
+        makeMessage({
+          name: 'bar',
+          action: 'building',
+        })
+      );
+      sinon.assert.notCalled(console.log);
+    });
+    it('should not log built if obj name is different', function () {
+      var eventSource = window.EventSource.lastCall.returnValue;
+      eventSource.onmessage(
+        makeMessage({
+          name: 'bar',
+          action: 'built',
+        })
+      );
+      sinon.assert.notCalled(console.log);
+    });
   });
 
   context('with no browser environment', function () {

test/middleware-test.js

@@ -19,6 +19,19 @@ describe('middleware', function () {
         .expect('Content-Type', /^text\/event-stream\b/)
         .end(done);
     });
+    it('uses provided eventStream', function (done) {
+      setupServer({
+        eventStream: {
+          handler: function (req, res) {
+            res.writeHead(201, { 'Content-Type': 'fake content type' });
+            res.write('\n');
+          },
+        },
+      })();
+      request('/__webpack_hmr')
+        .expect('Content-Type', 'fake content type')
+        .end(done);
+    });
     it('should heartbeat every 10 seconds', function (done) {
       request('/__webpack_hmr').end(function (err, res) {
         if (err) return done(err);
@@ -48,13 +61,14 @@ describe('middleware', function () {
         if (err) return done(err);
 
         res.on('data', verify);
-
+        compiler.name = 'test name';
         compiler.emit('invalid');
 
         function verify() {
           assert.equal(res.events.length, 1);
           var event = JSON.parse(res.events[0].substring(5));
           assert.equal(event.action, 'building');
+          assert.equal(event.name, compiler.name);
           done();
         }
       });