fix: only add entries after compilers have been created (#1774)

Author: DylanPiercey

Diff for: bin/webpack-dev-server.js

@@ -20,7 +20,6 @@ const webpack = require('webpack');
 const options = require('./options');
 const Server = require('../lib/Server');
 
-const addEntries = require('../lib/utils/addEntries');
 const colors = require('../lib/utils/colors');
 const createConfig = require('../lib/utils/createConfig');
 const createDomain = require('../lib/utils/createDomain');
@@ -140,8 +139,6 @@ function processOptions(config) {
 function startDevServer(config, options) {
   const log = createLogger(options);
 
-  addEntries(config, options);
-
   let compiler;
 
   try {

Diff for: test/Server.test.js

@@ -1,12 +1,71 @@
 'use strict';
 
+const { relative, sep } = require('path');
 const webpack = require('webpack');
 const request = require('supertest');
 const Server = require('../lib/Server');
 const config = require('./fixtures/simple-config/webpack.config');
 const helper = require('./helper');
 
 describe('Server', () => {
+  describe('addEntries', () => {
+    it('add hot option', () => {
+      return new Promise((res) => {
+        // eslint-disable-next-line
+        const Server = require('../lib/Server');
+        const compiler = webpack(config);
+        const server = new Server(compiler, {
+          hot: true,
+        });
+
+        expect(
+          server.middleware.context.compiler.options.entry.map((p) => {
+            return relative('.', p).split(sep);
+          })
+        ).toMatchSnapshot();
+        expect(
+          server.middleware.context.compiler.options.plugins
+        ).toMatchSnapshot();
+
+        compiler.hooks.done.tap('webpack-dev-server', () => {
+          server.close(() => {
+            res();
+          });
+        });
+
+        compiler.run(() => {});
+      });
+    });
+
+    it('add hotOnly option', () => {
+      return new Promise((res) => {
+        // eslint-disable-next-line
+        const Server = require('../lib/Server');
+        const compiler = webpack(config);
+        const server = new Server(compiler, {
+          hotOnly: true,
+        });
+
+        expect(
+          server.middleware.context.compiler.options.entry.map((p) => {
+            return relative('.', p).split(sep);
+          })
+        ).toMatchSnapshot();
+        expect(
+          server.middleware.context.compiler.options.plugins
+        ).toMatchSnapshot();
+
+        compiler.hooks.done.tap('webpack-dev-server', () => {
+          server.close(() => {
+            res();
+          });
+        });
+
+        compiler.run(() => {});
+      });
+    });
+  });
+
   // issue: https://github.com/webpack/webpack-dev-server/issues/1724
   describe('express.static.mine.types', () => {
     beforeEach(() => {

Diff for: test/__snapshots__/Server.test.js.snap

@@ -1,5 +1,65 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`Server addEntries add hot option 1`] = `
+Array [
+  Array [
+    "client",
+    "index.js?http:",
+    "localhost",
+  ],
+  Array [
+    "node_modules",
+    "webpack",
+    "hot",
+    "dev-server.js",
+  ],
+  Array [
+    "foo.js",
+  ],
+]
+`;
+
+exports[`Server addEntries add hot option 2`] = `
+Array [
+  HotModuleReplacementPlugin {
+    "fullBuildTimeout": 200,
+    "multiStep": undefined,
+    "options": Object {},
+    "requestTimeout": 10000,
+  },
+]
+`;
+
+exports[`Server addEntries add hotOnly option 1`] = `
+Array [
+  Array [
+    "client",
+    "index.js?http:",
+    "localhost",
+  ],
+  Array [
+    "node_modules",
+    "webpack",
+    "hot",
+    "only-dev-server.js",
+  ],
+  Array [
+    "foo.js",
+  ],
+]
+`;
+
+exports[`Server addEntries add hotOnly option 2`] = `
+Array [
+  HotModuleReplacementPlugin {
+    "fullBuildTimeout": 200,
+    "multiStep": undefined,
+    "options": Object {},
+    "requestTimeout": 10000,
+  },
+]
+`;
+
 exports[`Server stats should works with difference stats values (contains 'hash', 'assets', 'warnings' and 'errors') 1`] = `
 Array [
   "errors",