refactor: imports

Author: snitin315

lib/Server.js

@@ -2,17 +2,11 @@
 
 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 express = require('express');
-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');
@@ -99,7 +93,9 @@ 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) {
@@ -159,6 +155,8 @@ class Server {
   }
 
   setupDevMiddleware() {
+    const webpackDevMiddleware = require('webpack-dev-middleware');
+
     // middleware for serving webpack bundle
     this.middleware = webpackDevMiddleware(
       this.compiler,
@@ -167,6 +165,8 @@ class Server {
   }
 
   setupCompressFeature() {
+    const compress = require('compression');
+
     this.app.use(compress());
   }
 
@@ -344,6 +344,8 @@ class Server {
     this.options.static.forEach((staticOption) => {
       staticOption.publicPath.forEach((publicPath) => {
         if (staticOption.serveIndex) {
+          const serveIndex = require('serve-index');
+
           this.app.use(publicPath, (req, res, next) => {
             // serve-index doesn't fallthrough non-get/head request to next middleware
             if (req.method !== 'GET' && req.method !== 'HEAD') {
@@ -560,9 +562,13 @@ class Server {
           this.app
         );
       } else {
+        const https = require('https');
+
         this.server = https.createServer(this.options.https, this.app);
       }
     } else {
+      const http = require('http');
+
       this.server = http.createServer(this.app);
     }