This patch, intended for Mastodon v4.2 releases, changes some webpack settings so that I can actually build Mastodon on a VPS with low amounts of RAM.

low-ram.diff

diff --git a/config/webpack/production.js b/config/webpack/production.js
index cec810184..a5807830a 100644
--- a/config/webpack/production.js
+++ b/config/webpack/production.js
@@ -15,8 +15,9 @@ const sharedConfig = require('./shared');
 const root = resolve(__dirname, '..', '..');
 
 module.exports = merge(sharedConfig, {
+  parallelism: 1,
   mode: 'production',
-  devtool: 'source-map',
+  devtool: 'none',
   stats: 'normal',
   bail: true,
   optimization: {
@@ -24,8 +25,8 @@ module.exports = merge(sharedConfig, {
     minimizer: [
       new TerserPlugin({
         cache: true,
-        parallel: true,
-        sourceMap: true,
+        parallel: false,
+        sourceMap: false,
       }),
     ],
   },