[functions] How to automatically transpile TS during local testing

[Mikhail Turilin]

Context

I write Firebase functions in TypeScript. I would like "firebase serve" to automatically transpile changes.

Observed

When I use "firebase serve --only functions", the TypeScript code is not automatically transpired to JS. 

So, each time I make change I have to:

1. ^C to stop "firebase serve" process
2. Run "npm run build --prefix functions" to transpile
3. Run "firebase serve --only functions" again
   

This is quite tedious. Is there a better way?

Thanks in advance! 

[Kato Richardson]

Does tsc -w not work here? Seems like that would.

I'll ping some of the gurus on this and see if they have more thoughts.

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Kato Richardson |

Developer Programs Eng |

kato...@google.com |

775-235-8398

[cal...@piedparker.com]

tsc -w | firebase serve --only functions,hosting

[Doug Stevenson]

Please read this blog for a discussion bout using tsc --watch.

Doug