I built localstack for google cloud. its free to use.

https://localstack-google.github.io

top points to note

1. google emulators are very limited in prod like features - localcloud extendeds google provided emulators to add more features.

2. localcloud adds persistence ( data is stored locally )

3. bigquery emulator is rewritten from scratch on top of duckdb

would love to get your feedback from the community on this.