refactor: imports

lib/Server.js

@@ -2,36 +2,18 @@
 
 const path = require('path');
 const url = require('url');
-const http = require('http');
-const https = require('https');
 const fs = require('graceful-fs');
 const ipaddr = require('ipaddr.js');
 const internalIp = require('internal-ip');
 const killable = require('killable');
-const chokidar = require('chokidar');
 const express = require('express');
-const { createProxyMiddleware } = require('http-proxy-middleware');
-const historyApiFallback = require('connect-history-api-fallback');
-const compress = require('compression');
-const serveIndex = require('serve-index');
-const webpack = require('webpack');
-const webpackDevMiddleware = require('webpack-dev-middleware');
-const getFilenameFromUrl =
-  require('webpack-dev-middleware/dist/utils/getFilenameFromUrl').default;
 const { validate } = require('schema-utils');
-const DevServerPlugin = require('./utils/DevServerPlugin');
 const normalizeOptions = require('./utils/normalizeOptions');
-const getCertificate = require('./utils/getCertificate');
 const colors = require('./utils/colors');
-const runOpen = require('./utils/runOpen');
-const runBonjour = require('./utils/runBonjour');
 const routes = require('./utils/routes');
 const getSocketServerImplementation = require('./utils/getSocketServerImplementation');
 const getCompilerConfigArray = require('./utils/getCompilerConfigArray');
-const getStatsOption = require('./utils/getStatsOption');
-const getColorsOption = require('./utils/getColorsOption');
 const setupExitSignals = require('./utils/setupExitSignals');
-const findPort = require('./utils/findPort');
 const schema = require('./options.json');
 
 if (!process.env.WEBPACK_SERVE) {
@@ -93,6 +75,8 @@ class Server {
   }
 
   applyDevServerPlugin() {
+    const DevServerPlugin = require('./utils/DevServerPlugin');
+
     const compilers = this.compiler.compilers || [this.compiler];
 
     // eslint-disable-next-line no-shadow
@@ -102,7 +86,9 @@ class Server {
   }
 
   setupProgressPlugin() {
-    new webpack.ProgressPlugin((percent, msg, addInfo) => {
+    const { ProgressPlugin } = require('webpack');
+
+    new ProgressPlugin((percent, msg, addInfo) => {
       percent = Math.floor(percent * 100);
 
       if (percent === 100) {
@@ -162,6 +148,8 @@ class Server {
   }
 
   setupDevMiddleware() {
+    const webpackDevMiddleware = require('webpack-dev-middleware');
+
     // middleware for serving webpack bundle
     this.middleware = webpackDevMiddleware(
       this.compiler,
@@ -170,10 +158,14 @@ class Server {
   }
 
   setupCompressFeature() {
+    const compress = require('compression');
+
     this.app.use(compress());
   }
 
   setupProxyFeature() {
+    const { createProxyMiddleware } = require('http-proxy-middleware');
+
     /**
      * Assume a proxy configuration specified as:
      * proxy: {
@@ -319,6 +311,8 @@ class Server {
   }
 
   setupHistoryApiFallbackFeature() {
+    const historyApiFallback = require('connect-history-api-fallback');
+
     const fallback =
       typeof this.options.historyApiFallback === 'object'
         ? this.options.historyApiFallback
@@ -340,6 +334,8 @@ class Server {
   }
 
   setupStaticServeIndexFeature() {
+    const serveIndex = require('serve-index');
+
     this.options.static.forEach((staticOption) => {
       staticOption.publicPath.forEach((publicPath) => {
         if (staticOption.serveIndex) {
@@ -514,6 +510,8 @@ class Server {
     }
 
     if (this.options.https) {
+      const getCertificate = require('./utils/getCertificate');
+
       for (const property of ['cacert', 'pfx', 'key', 'cert']) {
         const value = this.options.https[property];
         const isBuffer = value instanceof Buffer;
@@ -546,6 +544,9 @@ class Server {
   }
 
   createServer() {
+    const https = require('https');
+    const http = require('http');
+
     if (this.options.https) {
       if (this.options.http2) {
         // TODO: we need to replace spdy with http2 which is an internal module
@@ -628,6 +629,8 @@ class Server {
   }
 
   showStatus() {
+    const getColorsOption = require('./utils/getColorsOption');
+
     const useColor = getColorsOption(getCompilerConfigArray(this.compiler));
     const protocol = this.options.https ? 'https' : 'http';
     const { address, port } = this.server.address();
@@ -749,13 +752,17 @@ class Server {
     }
 
     if (this.options.open) {
+      const runOpen = require('./utils/runOpen');
+
       const openTarget = prettyPrintUrl(this.hostname || 'localhost');
 
       runOpen(openTarget, this.options.open, this.logger);
     }
   }
 
   listen(port, hostname, fn) {
+    const findPort = require('./utils/findPort');
+
     if (hostname === 'local-ip') {
       this.hostname = internalIp.v4.sync() || internalIp.v6.sync() || '0.0.0.0';
     } else if (hostname === 'local-ipv4') {
@@ -784,6 +791,8 @@ class Server {
             }
 
             if (this.options.bonjour) {
+              const runBonjour = require('./utils/runBonjour');
+
               runBonjour(this.options);
             }
 
@@ -838,6 +847,8 @@ class Server {
   }
 
   getStats(statsObj) {
+    const getStatsOption = require('./utils/getStatsOption');
+
     const stats = Server.DEFAULT_STATS;
 
     const configArr = getCompilerConfigArray(this.compiler);
@@ -974,6 +985,9 @@ class Server {
   }
 
   serveMagicHtml(req, res, next) {
+    const getFilenameFromUrl =
+      require('webpack-dev-middleware/dist/utils/getFilenameFromUrl').default;
+
     const _path = req.path;
 
     try {
@@ -1050,6 +1064,8 @@ class Server {
       interval,
     };
 
+    const chokidar = require('chokidar');
+
     const watcher = chokidar.watch(watchPath, finalWatchOptions);
 
     // disabling refreshing on changing the content