include ReactPerf in non-production builds

Author: shockey

make-webpack-config.js

@@ -72,7 +72,9 @@ module.exports = function(rules, options) {
       new UglifyJsPlugin({
         uglifyOptions: {
           mangle: specialOptions.mangle,
-          compress: specialOptions.mangle,
+          compress: specialOptions.mangle ? {
+            dead_code: true
+          } : false,
           beautify: !specialOptions.mangle,
         },
 

src/core/index.js

@@ -7,6 +7,10 @@ import ApisPreset from "core/presets/apis"
 import * as AllPlugins from "core/plugins/all"
 import { parseSearch } from "core/utils"
 
+if (process.env.NODE_ENV !== "production" && typeof window !== "undefined") {
+  win.Perf = require("react-dom/lib/ReactPerf")
+}
+
 // eslint-disable-next-line no-undef
 const { GIT_DIRTY, GIT_COMMIT, PACKAGE_VERSION, HOSTNAME, BUILD_TIME } = buildInfo