Images size gets reduced in production build

webpack.prod.conf file

‘use strict’

const fs = require(‘fs’)
const path = require(‘path’)
const utils = require(’./utils’)
const webpack = require(‘webpack’)
const config = require(’…/config’)
const merge = require(‘webpack-merge’)
const baseWebpackConfig = require(’./webpack.base.conf’)
const CopyWebpackPlugin = require(‘copy-webpack-plugin’)
const HtmlWebpackPlugin = require(‘html-webpack-plugin’)
const ExtractTextPlugin = require(‘extract-text-webpack-plugin’)
const OptimizeCSSPlugin = require(‘optimize-css-assets-webpack-plugin’)
const SWPrecacheWebpackPlugin = require(‘sw-precache-webpack-plugin’)
const loadMinified = require(’./load-minified’)

const env = config.build.env

const webpackConfig = merge(baseWebpackConfig, {
module: {
rules: utils.styleLoaders({
sourceMap: config.build.productionSourceMap,
extract: true
})
},
devtool: config.build.productionSourceMap ? ‘#source-map’ : false,
output: {
path: config.build.assetsRoot,
filename: utils.assetsPath(‘js/[name].[chunkhash].js’),
chunkFilename: utils.assetsPath(‘js/[id].[chunkhash].js’)
},
plugins: [
// http://vuejs.github.io/vue-loader/en/workflow/production.html
new webpack.DefinePlugin({
‘process.env’: env
}),
new webpack.optimize.UglifyJsPlugin({
compress: {
warnings: false
},
sourceMap: true
}),
// extract css into its own file
new ExtractTextPlugin({
filename: utils.assetsPath(‘css/[name].[contenthash].css’)
}),
// Compress extracted CSS. We are using this plugin so that possible
// duplicated CSS from different components can be deduped.
new OptimizeCSSPlugin({
cssProcessorOptions: {
safe: true
}
}),
// generate dist index.html with correct asset hash for caching.
// you can customize output by editing /index.html
// see https://github.com/ampedandwired/html-webpack-plugin
new HtmlWebpackPlugin({
filename: config.build.index,
template: ‘index.html’,
inject: true,
minify: {
removeComments: true,
collapseWhitespace: true,
removeAttributeQuotes: true
// more options:
// https://github.com/kangax/html-minifier#options-quick-reference
},
// necessary to consistently work with multiple chunks via CommonsChunkPlugin
chunksSortMode: ‘dependency’,
serviceWorkerLoader: <script>${loadMinified(path.join(__dirname, './service-worker-prod.js'))}</script>
}),
// split vendor js into its own file
new webpack.optimize.CommonsChunkPlugin({
name: ‘vendor’,
minChunks: function (module, count) {
// any required modules inside node_modules are extracted to vendor
return (
module.resource &&
/.js$/.test(module.resource) &&
module.resource.indexOf(
path.join(__dirname, ‘…/node_modules’)
) === 0
)
}
}),
// extract webpack runtime and module manifest to its own file in order to
// prevent vendor hash from being updated whenever app bundle is updated
new webpack.optimize.CommonsChunkPlugin({
name: ‘manifest’,
chunks: [‘vendor’]
}),
// copy custom static assets
new CopyWebpackPlugin([
{
from: path.resolve(__dirname, ‘…/static’),
to: config.build.assetsSubDirectory,
ignore: [’.’]
}
]),
new webpack.ProvidePlugin({
$: ‘jquery’,
jquery: ‘jquery’,
‘window.jQuery’: ‘jquery’,
jQuery: ‘jquery’
}),
// service worker caching
new SWPrecacheWebpackPlugin({
cacheId: ‘numeriweb’,
filename: ‘service-worker.js’,
staticFileGlobs: ['dist/**/
.{js,html,css,png}’],
minify: false,
stripPrefix: ‘dist/’,
runtimeCaching: [
{
urlPattern: /^https://fonts.googleapis.com//,
handler: ‘cacheFirst’
},
{
urlPattern: /^https://use.fontawesome.com//,
handler: ‘cacheFirst’
},
{
urlPattern: /^https://fonts.gstatic.com//,
handler: ‘cacheFirst’
},
{
urlPattern: /^https://demo.numericlasse.fr//,
handler: ‘networkFirst’
},
{
urlPattern: /^http://localhost//,
handler: ‘cacheFirst’
},
{
urlPattern: /^https://ghibliapi.herokuapp.com//,
handler: ‘cacheFirst’
},
{
urlPattern: /^https://code.getmdl.io//,
handler: ‘cacheFirst’
}]
})
]
})

if (config.build.productionGzip) {
const CompressionWebpackPlugin = require(‘compression-webpack-plugin’)

webpackConfig.plugins.push(
new CompressionWebpackPlugin({
asset: ‘[path].gz[query]’,
algorithm: ‘gzip’,
test: new RegExp(
‘\.(’ +
config.build.productionGzipExtensions.join(’|’) +
‘)$’
),
threshold: 10240,
minRatio: 0.8
})
)
}

if (config.build.bundleAnalyzerReport) {
const BundleAnalyzerPlugin = require(‘webpack-bundle-analyzer’).BundleAnalyzerPlugin
webpackConfig.plugins.push(new BundleAnalyzerPlugin())
}

module.exports = webpackConfig