RFC .projenrc.ts support

[andrestone]

For more complex projects, specially with the monorepo support, wouldn't it be interesting to:

npx projen init typescript --types

Then generate a .projenrc.ts file instead of the .js and incorporate a check on the cli to compile on the fly if .ts file is there?

[eladb]

Yes, why not?

[eladb]

I am having seconds thoughts here. Let's keep it in the backlog for now and see how far we can get with JavaScript.

[eladb]

This will also require ts-node

[andrestone]

Maybe npx ts-node as it is in CDK?

[eladb]

That would mean that every time you run projen ts-node will be executed or it has to be installed globally (which means that which ts-node should just work.

This is related to perhaps adding support for other languages. Would be nice to be able to also author projenrc in python for example, which will also have some ambient prerequisites.

I am open to doing that: we can auto-discover the .projenrc file type based on its extension and then require the user to have the "runtime" pre-installed in their system.

[skyrpex]

There's also https://github.com/antfu/esno, which uses esbuild to transpile on the fly. I use it with CDK and am pretty happy with it.

Maybe a file like cdk.json would help here to make it customizable?

[eladb]

esbuild does not perform type checking as far as I know, Correct?

[skyrpex]

Exactly, it just executes the code. Maybe that's not what you want in this scenario.

[github-actions]

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[eladb]

Projenrc in typescript is now supported via:

projen new typescript --projenrc-ts