Is it required to run a full monorepo build before test?

[wixplosives]

Is it required to run a full monorepo build before test?

[AviVahl]

In this current setup, the answer tends to be yes.

These days, I find that using the actual .js files that are going to be consumed by others (via npm package) is preferable to trying to remap own tooling directly to sources (previous iterations of this monorepo did just that).

Now, that doesn't mean you can't just execute npx tsc --build src when inside the app package, which will only build app and components (meaning the package itself, and packages it depends on). This allows executing app's test separately, while knowing the dependencies got built.

This gets trickier when other processes (like bundling) use the output of typescript, so doing this only takes care of the typescript end. An example to that is the server that assumes app will be already bundled, ready to be served.

We discussed the concept of automated partial testing within my team, but more work has to be done to make such flow a reality.

[barak007]

I would like to add here one more thing
You usually only pay the "full build" once in dev when there is no existing dist, other times you only build what you have changed.