Drop useless moment locales from built file

build/webpack.prod.conf.js

@@ -1,4 +1,5 @@
 'use strict'
+const fs = require('fs')
 const path = require('path')
 const svg2png = require('svg2png')
 const utils = require('./utils')
@@ -15,6 +16,18 @@ const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
 
 const env = require('../config/prod.env')
 
+// List available locales, to fetch only the required locales from Moment.JS:
+// Build a regexp that selects the locale's name without the JS extension (due
+// to the way moment includes those) and ensure that's the last character to
+// not include locale variants. See discussion in
+// https://framagit.org/bnjbvr/kresus/merge_requests/448#note_130514
+const locales = fs.readdirSync('src/i18n').filter(x => x != 'index.js').map(
+    x => x.replace('.js', '')
+);
+const localesRegex = new RegExp(
+    '(' + locales.join('|') + ')$'
+);
+
 const webpackConfig = merge(baseWebpackConfig, {
     module: {
         rules: utils.styleLoaders({
@@ -126,6 +139,9 @@ const webpackConfig = merge(baseWebpackConfig, {
             minChunks: 3
         }),
 
+        // Only keep the useful locales from Moment.
+        new webpack.ContextReplacementPlugin(/moment[\/\\]locale$/, localesRegex),
+
         // copy custom static assets
         new CopyWebpackPlugin([
             {

config/index.js

@@ -69,9 +69,9 @@ module.exports = {
 
     // Run the build command with an extra argument to
     // View the bundle analyzer report after build finishes:
-    // `npm run build --report`
+    // `ANALYZE=true yarn build`
     // Set to `true` or `false` to always turn it on or off
-    bundleAnalyzerReport: process.env.npm_config_report,
+    bundleAnalyzerReport: process.env.ANALYZE,
 
     // OpenGraph-related variables
     ogURL: 'https://cyclo.phyks.me',

package.json

@@ -70,7 +70,7 @@
         "vue-style-loader": "^3.0.1",
         "vue-template-compiler": "^2.5.2",
         "webpack": "^3.6.0",
-        "webpack-bundle-analyzer": "^2.9.0",
+        "webpack-bundle-analyzer": "^2.13.1",
         "webpack-dev-server": "^2.9.1",
         "webpack-merge": "^4.1.0"
     },

yarn.lock

@@ -6707,7 +6707,7 @@ wbuf@^1.1.0, wbuf@^1.7.2:
   dependencies:
     minimalistic-assert "^1.0.0"
 
-webpack-bundle-analyzer@^2.9.0:
+webpack-bundle-analyzer@^2.13.1:
   version "2.13.1"
   resolved "https://registry.yarnpkg.com/webpack-bundle-analyzer/-/webpack-bundle-analyzer-2.13.1.tgz#07d2176c6e86c3cdce4c23e56fae2a7b6b4ad526"
   dependencies: