Merge pull request #3137 from alphagov/minify-uglifyjs-config

Enable UglifyJS compatibility workarounds
alphagov · Jan 16, 2023 · c5fc0e3 · c5fc0e3
2 parents 6280b88 + 04a6669
commit c5fc0e3
Showing 1 changed file with 13 additions and 2 deletions.
diff --git a/tasks/compile-javascripts.mjs b/tasks/compile-javascripts.mjs
@@ -97,13 +97,24 @@ export async function compileJavaScript ([modulePath, { srcPath, destPath, minif
  */
 export function minifyJavaScript (modulePath, result) {
   const minified = minify({ [modulePath]: result.code }, {
-    ie8: true,
     sourceMap: {
       content: result.map,
       filename: result.map.file,
       url: `${result.map.file}.map`,
       includeSources: true
-    }
+    },
+
+    // Prevent unsafe polyfill changes
+    // https://github.com/mishoo/UglifyJS#compress-options
+    compress: {
+      inline: 2
+    },
+
+    // Compatibility workarounds
+    ie8: true,
+    module: false,
+    v8: true,
+    webkit: true
   })
 
   if (minified.error) {