feat: check duplicated packages in webpack

aurelia/binding#702 this is a safe check to warn user about duplicated aurelia-binding v1 and v2 (and potentially other duplicates).

Author: 3cp

lib/commands/new/buildsystems/webpack/index.js

@@ -51,6 +51,7 @@ module.exports = function(project, options) {
     'copy-webpack-plugin',
     'mini-css-extract-plugin',
     'aurelia-webpack-plugin',
+    'duplicate-package-checker-webpack-plugin',
     'webpack',
     'webpack-cli',
     'webpack-dev-server',

lib/dependencies.json

@@ -41,6 +41,7 @@
   "css-loader": "^0.28.11",
   "debounce": "^1.1.0",
   "del": "^3.0.0",
+  "duplicate-package-checker-webpack-plugin": "^3.0.0",
   "event-stream": "^3.3.4",
   "expose-loader": "^0.7.5",
   "mini-css-extract-plugin": "^0.4.1",

lib/resources/content/webpack.config.template.js

@@ -2,6 +2,7 @@ const path = require('path');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const CopyWebpackPlugin = require('copy-webpack-plugin');
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+const DuplicatePackageCheckerPlugin = require('duplicate-package-checker-webpack-plugin');
 const project = require('./aurelia_project/aurelia.json');
 const { AureliaPlugin, ModuleDependenciesPlugin } = require('aurelia-webpack-plugin');
 const { ProvidePlugin } = require('webpack');
@@ -79,15 +80,15 @@ module.exports = ({production, server, extractCss, coverage, analyze} = {}) => (
         use: cssRules
       },
       // @if cssProcessor.id='less'
-      { 
-        test: /\.less$/i, 
+      {
+        test: /\.less$/i,
         use: ['style-loader', 'css-loader', 'less-loader'],
         issuer: /\.[tj]s$/i
       },
-      { 
-        test: /\.less$/i, 
+      {
+        test: /\.less$/i,
         use: ['css-loader', 'less-loader'],
-        issuer: /\.html?$/i 
+        issuer: /\.html?$/i
       },
       // @endif
       // @if cssProcessor.id='stylus'
@@ -99,7 +100,7 @@ module.exports = ({production, server, extractCss, coverage, analyze} = {}) => (
       {
         test: /\.styl$/i,
         use: ['css-loader', 'stylus-loader'],
-        issuer: /\.html?$/i 
+        issuer: /\.html?$/i
       },
       // @endif
       // @if cssProcessor.id='sass'
@@ -141,6 +142,7 @@ module.exports = ({production, server, extractCss, coverage, analyze} = {}) => (
     ]
   },
   plugins: [
+    new DuplicatePackageCheckerPlugin(),
     new AureliaPlugin(),
     new ProvidePlugin({
       'Promise': 'bluebird'