fix(Server): mime type for wasm in contentBase directory (#1575) (#1580)

lib/Server.js

@@ -132,6 +132,10 @@ function Server (compiler, options = {}, _log) {
   // eslint-disable-next-line
   const app = this.app = new express();
 
+  // ref: https://github.com/webpack/webpack-dev-server/issues/1575
+  // remove this when send@^0.16.3
+  express.static.mime.types.wasm = 'application/wasm';
+
   app.all('*', (req, res, next) => {
     if (this.checkHost(req.headers)) {
       return next();

test/ContentBase.test.js

@@ -121,4 +121,18 @@ describe('ContentBase', () => {
         .expect(404, done);
     });
   });
+
+  describe('Content type', () => {
+    before((done) => {
+      server = helper.start(config, {
+        contentBase: [contentBasePublic]
+      }, done);
+      req = request(server.app);
+    });
+
+    it('Request foo.wasm', (done) => {
+      req.get('/foo.wasm')
+        .expect('Content-Type', 'application/wasm', done);
+    });
+  });
 });