Upgrade uglify-es to 3.1.9

Reviewed By: davidaurelio

Differential Revision: D6309485

fbshipit-source-id: 17d8b66a2a676a9a556509e28a48ee703fc6da89

packages/metro-bundler/package.json

@@ -48,7 +48,7 @@
     "source-map": "^0.5.6",
     "temp": "0.8.3",
     "throat": "^4.1.0",
-    "uglify-es": "^3.1.0",
+    "uglify-es": "^3.1.9",
     "wordwrap": "^1.0.0",
     "write-file-atomic": "^1.2.0",
     "xpipe": "^1.0.5",

packages/metro-bundler/src/JSTransformer/worker/minify.js

@@ -50,6 +50,10 @@ function minify(inputCode: string, inputMap: ?MappingsMap) {
       includeSources: false,
     },
     toplevel: true,
+    compress: {
+      // reduce_funcs inlines single-use function, which cause perf regressions.
+      reduce_funcs: false,
+    },
   });
 
   if (result.error) {