diff --git a/lib/dev.js b/lib/dev.js
index 73e0745904..e3fd9f4d5d 100644
--- a/lib/dev.js
+++ b/lib/dev.js
@@ -1,109 +1,107 @@
-const path = require('path');
-const fs = require('fs-extra');
-const chalk = require('chalk');
-const webpack = require('webpack');
-const chokidar = require('chokidar');
-const convert = require('koa-connect');
-const range = require('koa-range');
-const mount = require('koa-mount');
-const serveStatic = require('koa-static');
-const history = require('connect-history-api-fallback');
-const portfinder = require('portfinder');
-const serve = require('webpack-serve');
-const serveWaitpage = require('webpack-serve-waitpage');
-const webpackNiceLog = require('webpack-nicelog');
-const HtmlWebpackPlugin = require('html-webpack-plugin');
-const load = require('./loader');
-const createDevConfig = require('./webpack/dev');
-
-async function getPort(port) {
-  portfinder.basePort = parseInt(port, 10) || 8080;
-  return await portfinder.getPortPromise();
-}
-
-module.exports = async function dev(sourceDir, cliOptions = {}) {
-  // load site props from preprocessed files in source directory
-  const props = await load(sourceDir);
-
-  // Reload for any add/change/remove of file
-  const reload = () => {
-    load(sourceDir).catch(err => {
-      console.error(chalk.red(err.stack));
-    });
-  };
-  const fsWatcher = chokidar.watch(['**/*.md', 'config.js'], {
-    cwd: sourceDir,
-    ignoreInitial: true
-  });
-  fsWatcher.on('add', reload);
-  fsWatcher.on('change', reload);
-  fsWatcher.on('unlink', reload);
-  fsWatcher.on('addDir', reload);
-  fsWatcher.on('unlinkDir', reload);
-
-  // resolve webpack config
-  let config = createDevConfig(props);
-
-  const port = await getPort(cliOptions.port);
-  const {publicPath} = props;
-
-  config.plugin('WebpackNiceLog').use(webpackNiceLog, [
-    {
-      onDone: () => {
-        console.log(
-          `\n${chalk.blue('Development server available at ')}${chalk.cyan(
-            `http://localhost:${port}${publicPath}`
-          )}`
-        );
-      }
-    }
-  ]);
-
-  config.plugin('html-webpack-plugin').use(HtmlWebpackPlugin, [
-    {
-      inject: false,
-      hash: true,
-      template: path.resolve(__dirname, 'core/index.html'),
-      filename: 'index.html'
-    }
-  ]);
-
-  // create compiler from generated webpack config
-  config = config.toConfig();
-  const compiler = webpack(config);
-
-  // webpack-serve
-  const nonExistentDir = path.resolve(__dirname, 'non-existent');
-  await serve(
-    {},
-    {
-      content: [nonExistentDir],
-      compiler,
-      open: true,
-      devMiddleware: {
-        logLevel: 'silent'
-      },
-      hotClient: {
-        port: port + 1,
-        logLevel: 'error'
-      },
-      logLevel: 'error',
-      port,
-      add: (app, middleware, options) => {
-        const staticDir = path.resolve(sourceDir, 'public');
-        if (fs.existsSync(staticDir)) {
-          app.use(mount(publicPath, serveStatic(staticDir)));
-        }
-        app.use(serveWaitpage(options, {theme: 'dark'})); // https://github.com/elisherer/webpack-serve-waitpage#middleware-options
-        app.use(range); // enable range request https://tools.ietf.org/html/rfc7233
-        app.use(
-          convert(
-            history({
-              rewrites: [{from: /\.html$/, to: '/'}]
-            })
-          )
-        );
-      }
-    }
-  );
-};
+const path = require('path');
+const fs = require('fs-extra');
+const chalk = require('chalk');
+const webpack = require('webpack');
+const chokidar = require('chokidar');
+const convert = require('koa-connect');
+const range = require('koa-range');
+const mount = require('koa-mount');
+const serveStatic = require('koa-static');
+const history = require('connect-history-api-fallback');
+const portfinder = require('portfinder');
+const serve = require('webpack-serve');
+const serveWaitpage = require('webpack-serve-waitpage');
+const webpackNiceLog = require('webpack-nicelog');
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const load = require('./loader');
+const createDevConfig = require('./webpack/dev');
+
+async function getPort(port) {
+  portfinder.basePort = parseInt(port, 10) || 8080;
+  return await portfinder.getPortPromise();
+}
+
+module.exports = async function dev(sourceDir, cliOptions = {}) {
+  // load site props from preprocessed files in source directory
+  const props = await load(sourceDir);
+
+  // Reload for any add/change/remove of file
+  const reload = () => {
+    load(sourceDir).catch(err => {
+      console.error(chalk.red(err.stack));
+    });
+  };
+  const fsWatcher = chokidar.watch(['**/*.md', 'config.js'], {
+    cwd: sourceDir,
+    ignoreInitial: true
+  });
+  fsWatcher.on('add', reload);
+  fsWatcher.on('change', reload);
+  fsWatcher.on('unlink', reload);
+  fsWatcher.on('addDir', reload);
+  fsWatcher.on('unlinkDir', reload);
+
+  const port = await getPort(cliOptions.port);
+  const {publicPath} = props;
+
+  // resolve webpack config
+  let config = createDevConfig(props);
+  config.plugin('WebpackNiceLog').use(webpackNiceLog, [
+    {
+      onDone: () => {
+        console.log(
+          `\n${chalk.blue('Development server available at ')}${chalk.cyan(
+            `http://localhost:${port}${publicPath}`
+          )}`
+        );
+      }
+    }
+  ]);
+  config.plugin('html-webpack-plugin').use(HtmlWebpackPlugin, [
+    {
+      inject: false,
+      hash: true,
+      template: path.resolve(__dirname, 'core/index.html'),
+      filename: 'index.html'
+    }
+  ]);
+
+  // create compiler from generated webpack config
+  config = config.toConfig();
+  const compiler = webpack(config);
+
+  // webpack-serve
+  const nonExistentDir = path.resolve(__dirname, 'non-existent');
+  await serve(
+    {},
+    {
+      content: [nonExistentDir],
+      compiler,
+      open: true,
+      devMiddleware: {
+        logLevel: 'silent'
+      },
+      hotClient: {
+        port: port + 1,
+        logLevel: 'error'
+      },
+      logLevel: 'error',
+      port,
+      add: (app, middleware, options) => {
+        const staticDir = path.resolve(sourceDir, 'public');
+        if (fs.existsSync(staticDir)) {
+          app.use(mount(publicPath, serveStatic(staticDir)));
+        }
+        app.use(serveWaitpage(options, {theme: 'dark'})); // https://github.com/elisherer/webpack-serve-waitpage#middleware-options
+        app.use(range); // enable range request https://tools.ietf.org/html/rfc7233
+        app.use(
+          convert(
+            history({
+              rewrites: [{from: /\.html$/, to: '/'}]
+            })
+          )
+        );
+      }
+    }
+  );
+};
diff --git a/lib/webpack/dev.js b/lib/webpack/dev.js
index 6b420c559c..8a2e5cd182 100644
--- a/lib/webpack/dev.js
+++ b/lib/webpack/dev.js
@@ -1,10 +1,10 @@
-const path = require('path');
-const createBaseConfig = require('./base');
-
-module.exports = function createDevConfig(props) {
-  const config = createBaseConfig(props);
-
-  config.entry('main').add(path.resolve(__dirname, '../core/index.js'));
-
-  return config;
-};
+const path = require('path');
+const createBaseConfig = require('./base');
+
+module.exports = function createDevConfig(props) {
+  const config = createBaseConfig(props);
+
+  config.entry('main').add(path.resolve(__dirname, '../core/index.js'));
+
+  return config;
+};