Testing Functions Locally with the Cloud Functions Shell
Blog post from Firebase
Firebase CLI version 3.11.0 introduced an experimental Cloud Functions shell that enables local testing of all Firebase function types before deployment, extending capabilities previously limited mainly to HTTPS functions. Using a Realtime Database `onCreate` trigger as an example, the shell can emulate incoming events, automatically supply wildcard parameters such as database push IDs, or accept custom parameter values, while allowing developers to inspect function logs and database writes. It also supports Database, HTTPS, Pub/Sub, Analytics, Storage, and Auth triggers, each with appropriate invocation syntax. Because the shell operates as a full Node.js REPL, developers can reuse command history, run arbitrary JavaScript, load external test files with `require()`, and pipe test scripts into the CLI, though users are encouraged to report issues because the feature remains experimental.
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