set typeofs: false to prevent mangling typeofs by uglify

fusionjs · Jul 22, 2018 · c94d03a · c94d03a
1 parent 84a09c7
commit c94d03a
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/build/compiler.js b/build/compiler.js
@@ -505,6 +505,13 @@ function getConfig({target, env, dir, watch, cover}) {
                 parallel: true, // default from webpack
                 uglifyOptions: {
                   compress: {
+                    // typeofs: true (default) transforms typeof foo == "undefined" into foo === void 0.
+
+                    // This mangles mapbox-gl creating an error when used alongside with window global mangling:
+                    // https://jeng.uberinternal.com/browse/WPT-1185
+                    // https://github.com/webpack-contrib/uglifyjs-webpack-plugin/issues/189
+                    typeofs: false,
+
                     inline: 1, // inline=2 can cause const reassignment (https://github.com/mishoo/UglifyJS2/issues/2842)
                   },
                 },