Google Cloud Function

Cloud function emulator

Guide: https://github.com/GoogleCloudPlatform/cloud-functions-emulator

In zsh: functions-emulator

There is an implicit watch, you can change the code, next time invoke it'll with new function: https://github.com/GoogleCloudPlatform/cloud-functions-emulator/issues/62

Serverless + cloud function emulator https://github.com/serverless/serverless-google-cloudfunctions/issues/74