Fix __DEV__ not being replaced in development bundle

Author: kitten

package.json

@@ -17,8 +17,8 @@
   ],
   "scripts": {
     "prepublishOnly": "run-s build",
-    "build:prod": "microbundle --target node -f cjs --compress --globals '__DEV__=false' -o dist/react-ssr-prepass.production.min.js",
-    "build:dev": "microbundle --target node -f cjs --no-compress --globals '__DEV__=true' -o dist/react-ssr-prepass.development.js",
+    "build:prod": "microbundle --target node -f cjs --compress --define '__DEV__=false' -o dist/react-ssr-prepass.production.min.js",
+    "build:dev": "microbundle --target node -f cjs --no-compress --define '__DEV__=true' -o dist/react-ssr-prepass.development.js",
     "build": "run-p build:prod build:dev",
     "test": "jest",
     "flow": "flow"

src/visitor.js

@@ -60,7 +60,7 @@ import {
 
 // Time in ms after which the otherwise synchronous visitor yields so that
 // the event loop is not interrupted for too long
-const YIELD_AFTER_MS = __DEV__ ? 20 : 5
+const YIELD_AFTER_MS = process.env.NODE_ENV !== 'production' ? 20 : 5
 
 const render = (
   type: ComponentType<DefaultProps> & ComponentStatics,