Skip type checking project reference redirect(declaration file from project reference) to improve perf

Search Terms

Suggestion

We could probably set internal option and skip type checking project reference redirects (included .d.ts files from project reference output)
This could speed up tsc --b mode by skipping type checking generated files, (eg. skip compiler.d.ts when building tsc project and so on...) Since in build mode referencing projects are not built if there are any errors in the referenced project this should report all errors.

Use Cases

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. new expression-level syntax)

Start by investigating TypeScript's project-reference redirect handling in tsc --b mode; the issue does not name implementation files or tests. Verify how generated .d.ts files are type-checked and how errors from referenced projects are reported. Done should preserve referenced-project error reporting while skipping redundant redirect checks and improving build performance.