isolatedDeclarations doesn't support tsconfig options

[tombl]

Some tsconfig options are relevant for declaration emit, but there's currently no way to pass these.

> code = "/** @internal */ export function hello() {}"

> require("oxc-transform").isolatedDeclaration("example.ts", code)
{ errors: ['TS9007: Function must have an explicit return type annotation with --isolatedDeclarations.'] }

> require("typescript").transpileDeclaration(code, {})
{
  diagnostics: [{
    messageText: 'Function must have an explicit return type annotation with --isolatedDeclarations.',
  }]
}

> require("typescript").transpileDeclaration(code, { compilerOptions: { stripInternal: true } })
{ outputText: 'export {};\n' }

[Dunqing]

Thanks for trying it out, in addition to supporting passing tsconfig options we also need to check the jsdoc @Boshen cc

[Boshen]

https://x.com/TitianCernicova/status/1808132493469442398

If stripInternal is specified TSC will respect the internal JSDoc tag even if ID is specified, and this is the behavior that is expected of other DTS implementations.

internal is useful as an escape hatch for functions you might export from a module, but don't actually want to export from your package so they don't need to make it into declaration files.

[Boshen]

Close as not planned. It seems like ID shouldn't check jsdoc nor tsconfig :-/

[tombl]

It's my understanding that isolatedDeclarations is mostly about not running a full typechecker to emit declarations.
Are there potential perf issues with supporting this or is it simply out of scope?

[Dunqing]

I've found that most of the popular libraries use @internal directive and strip them by stripInternal. So I think we should consider supporting it.