Support `diagnostics` inside `compilerOptions` in combination with `--build`

Search Terms

• diagnostics, build

related maybe? https://github.com/microsoft/TypeScript/issues/19725

Suggestion

It would be nice if you could combine --diagnostics and --build

Use Cases

I can just cd into a specific sub-project and run tsc --diagnostics there without a problem, however it would be nice to also have --diagnostics for a whole monorepo / project-references build.

Examples

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. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• [*] This feature would agree with the rest of TypeScript's Design Goals.

Comienza revisando el issue relacionado #19725 y comparando el comportamiento existente de tsc --diagnostics con --build entre las referencias de proyecto. Localiza el manejo de las opciones del compilador para diagnostics, compilerOptions y --build, y después define y prueba la salida de diagnostics esperada para una compilación completa del monorepo.