Does Firebase support ES6?

The long answer about why this is a complicated problem has been discussed in some blogs, for example here and here. EDIT: The firebase CLI now supports projects using TypeScript, which gives you access to ES7 syntax. It will automatically compile that down to ES6 for deployment to Cloud Functions .

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How does firebase emulator work?

The Firebase Local Emulator Suite allows you to test your code with our core products in an interoperable way. The Cloud Functions emulator supports HTTP functions, callable functions, and background functions triggered by Cloud Firestore, Realtime Database, Cloud Storage, Authentication, and Pub/Sub .

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