From 7317b7b2313bdddf3b2d3a6c4fa7f00f2cc0f645 Mon Sep 17 00:00:00 2001
From: Thibaut Girka <thib@sitedethib.com>
Date: Sat, 28 Jul 2018 16:42:13 +0200
Subject: [PATCH] Reduce assets precompilation time by about 20%
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Bundle most common webpack chunks into a “common” pack,
in a way similar to what upstream does.
---
 config/webpack/shared.js | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/config/webpack/shared.js b/config/webpack/shared.js
index 6b6629a373..58eab4b4cb 100644
--- a/config/webpack/shared.js
+++ b/config/webpack/shared.js
@@ -44,13 +44,16 @@ function reducePacks (data, into = {}) {
   return into;
 }
 
+const entries = Object.assign(
+  { locales: resolve('app', 'javascript', 'locales') },
+  localePacks,
+  reducePacks(core),
+  Object.keys(flavours).reduce((map, entry) => reducePacks(flavours[entry], map), {})
+);
+
+
 module.exports = {
-  entry: Object.assign(
-    { locales: resolve('app', 'javascript', 'locales') },
-    localePacks,
-    reducePacks(core),
-    Object.keys(flavours).reduce((map, entry) => reducePacks(flavours[entry], map), {})
-  ),
+  entry: entries,
 
   output: {
     filename: '[name].js',
@@ -67,11 +70,14 @@ module.exports = {
       cacheGroups: {
         default: false,
         vendors: false,
-        locales: {
-          name: 'locales',
-          chunks: 'all',
-          minChunks: Infinity,
+        common: {
+          name: 'common',
+          chunks (chunk) {
+            return !(chunk.name in entries);
+          },
+          minChunks: 2,
           minSize: 0,
+          test: /^(?!.*[\\\/]node_modules[\\\/]react-intl[\\\/]).+$/,
         },
       },
     },