Changes clone function used in webpack config to be a deep merge.

This fixes an issue where light-dist / light defined their own resolve property causing them to not get the base config resolve for extensions, etc.

Includes a few minor lint fixes that popped in my editor as well.

webpack.config.js

@@ -7,7 +7,29 @@ const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPl
 const getGitVersion = require('git-tag-version');
 const getGitCommitInfo = require('git-commit-info');
 
-const clone = (...args) => Object.assign({}, ...args);
+const isObject = (item) => {
+  return (item && typeof item === 'object' && !Array.isArray(item));
+};
+
+const mergeDeep = (target, ...sources) => {
+  if (!sources.length) return target;
+  const source = sources.shift();
+
+  if (isObject(target) && isObject(source)) {
+    for (const key in source) {
+      if (isObject(source[key])) {
+        if (!target[key]) Object.assign(target, { [key]: {} });
+        mergeDeep(target[key], source[key]);
+      } else {
+        Object.assign(target, { [key]: source[key] });
+      }
+    }
+  }
+
+  return mergeDeep(target, ...sources);
+};
+
+const clone = (...args) => mergeDeep({}, ...args);
 
 /* Allow to customise builds through env-vars */
 const env = process.env;
@@ -22,14 +44,17 @@ const baseConfig = {
   entry: './src/hls',
   resolve: {
     // Add `.ts` as a resolvable extension.
-    extensions: [".ts", ".js"]
+    extensions: ['.ts', '.js']
   },
   module: {
     strictExportPresence: true,
     rules: [
       // all files with a `.ts` extension will be handled by `ts-loader`
-      { test: /\.ts?$/, loader: "ts-loader" },
-      { test: /\.js?$/, exclude: [/node_modules/], loader: "ts-loader" },
+      {
+        test: /\.(ts|js)x?$/,
+        loader: 'ts-loader',
+        exclude: /node_modules/
+      }
     ]
   }
 };
@@ -47,7 +72,7 @@ const demoConfig = clone(baseConfig, {
     library: 'HlsDemo',
     libraryTarget: 'umd',
     libraryExport: 'default',
-    globalObject: 'this'  // https://github.com/webpack/webpack/issues/6642#issuecomment-370222543
+    globalObject: 'this' // https://github.com/webpack/webpack/issues/6642#issuecomment-370222543
   },
   optimization: {
     minimize: false
@@ -56,7 +81,7 @@ const demoConfig = clone(baseConfig, {
   devtool: 'source-map'
 });
 
-function getPluginsForConfig(type, minify = false) {
+function getPluginsForConfig (type, minify = false) {
   // common plugins.
 
   const defineConstants = getConstantsForConfig(type);
@@ -86,7 +111,6 @@ function getPluginsForConfig(type, minify = false) {
 }
 
 function getConstantsForConfig (type) {
-
   const gitCommitInfo = getGitCommitInfo();
   const suffix = gitCommitInfo.shortCommit ? ('-' + gitCommitInfo.shortCommit) : '';
 
@@ -212,7 +236,6 @@ multiConfig.push(demoConfig);
 
 // webpack matches the --env arguments to a string; for example, --env.debug.min translates to { debug: true, min: true }
 module.exports = (envArgs) => {
-
   let configs;
 
   if (!envArgs) {