clean script

package.json

@@ -29,6 +29,7 @@
     "xcode": "open playground/ios/playground.xcodeproj",
     "install-android": "cd playground/android && ./gradlew installDebug",
     "uninstall-android": "cd playground/android && ./gradlew uninstallAll",
+    "clean": "node ./scripts/clean.js",
     "start": "node ./scripts/start.js",
     "test-js": "node ./scripts/test-js.js",
     "test-unit-android": "node ./scripts/test.unit.android.js",

scripts/clean.js

@@ -0,0 +1,13 @@
+const exec = require('shell-utils').exec;
+
+run();
+
+function run() {
+  exec.kill('8081');
+  exec.execSync(`watchman watch-del-all || true`);
+  exec.execSync(`adb reverse tcp:8081 tcp:8081 || true`);
+  exec.execSync(`rm -rf lib/ios/DerivedData/`);
+  exec.execSync(`rm -rf playground/ios/DerivedData/`);
+  exec.execSync(`cd lib/android && ./gradlew clean`);
+  exec.execSync(`cd playground/android && ./gradlew clean`);
+}