Add new moduleResolution option: `yarn-pnp`

Search Terms

yarn pnp plug'n'play plug

Suggestion

Yarn has released a new feature for using modules without having a node_modules directory present: plug'n'play. Some community tooling is available for customizing the TypeScript compilerHost so that it can use plug'n'play modules, but this does not work for users of tsc.

My suggestion is to add a new "moduleResolution": "yarnpnp" option.

Use Cases / Examples

I want to be able to use yarn plug-n-play in my typescript projects. My projects are typically yarn monorepos where common libraries are basic node packages using tsc for compilation. This would allow the basic projects to continue using tsc, but with an alternative module resolution scheme.

Some community tooling has been created here for augmenting the CompileHost with a slightly updated moduleResolution strategy, but using it in basic projects would probably require a forked tsc.

https://github.com/arcanis/ts-pnp

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript / JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. new expression-level syntax)

Start by reviewing the TypeScript compilerHost and module-resolution areas, along with the linked ts-pnp tooling. The issue names no repository files or tests; completion would require defining the yarn Plug’n’Play resolution behavior and validating it with appropriate compiler tests.