fixing install

playground/scripts/postinstall.js

@@ -1,8 +1,18 @@
 const shellUtils = require('shell-utils');
 
-shellUtils.exec.execSync(`rm yarn.lock || true`);
-shellUtils.exec.execSync(`./scripts/ignoreReactWarnings.rb`);
+function installNavigation() {
+  shellUtils.exec.execSync(`mkdir -p ./node_modules/react-native-navigation`);
+  const navigationTar = shellUtils.exec.execSyncRead(`cd .. && npm pack`);
+  shellUtils.exec.execSync(`tar -xf ../${navigationTar} -C ./node_modules/react-native-navigation --strip 1`);
+  shellUtils.exec.execSync(`rm ../${navigationTar}`);
+}
+
+function run() {
+  shellUtils.exec.execSync(`rm yarn.lock || true`);
+  shellUtils.exec.execSync(`./scripts/ignoreReactWarnings.rb`);
+
+  installNavigation();
+}
+
+run();
 
-shellUtils.exec.execSync(`mkdir -p ./node_modules/react-native-navigation`);
-shellUtils.exec.execSync(`cd .. && npm pack`);
-//shellUtils.exec.execSync(`tar -xf ../react-native-navigation.tar`);