tsgo checking JS file it shouldn't

[jakebailey]

In https://github.com/dimitropoulos/tsgo-repro-dist-exclude, tsgo says:

npx tsgo --listFiles
dist/yep.mjs:1:1 - error TS2578: Unused '@ts-expect-error' directive.

1 // @ts-expect-error
  ~~~~~~~~~~~~~~~~~~~
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/@typescript+native-preview-linux-x64@7.0.0-dev.20250613.1/node_modules/@typescript/native-preview-linux-x64/lib/lib.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/@typescript+native-preview-linux-x64@7.0.0-dev.20250613.1/node_modules/@typescript/native-preview-linux-x64/lib/lib.es5.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/@typescript+native-preview-linux-x64@7.0.0-dev.20250613.1/node_modules/@typescript/native-preview-linux-x64/lib/lib.dom.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/@typescript+native-preview-linux-x64@7.0.0-dev.20250613.1/node_modules/@typescript/native-preview-linux-x64/lib/lib.webworker.importscripts.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/@typescript+native-preview-linux-x64@7.0.0-dev.20250613.1/node_modules/@typescript/native-preview-linux-x64/lib/lib.scripthost.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/@typescript+native-preview-linux-x64@7.0.0-dev.20250613.1/node_modules/@typescript/native-preview-linux-x64/lib/lib.decorators.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/@typescript+native-preview-linux-x64@7.0.0-dev.20250613.1/node_modules/@typescript/native-preview-linux-x64/lib/lib.decorators.legacy.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/src/yep.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/dist/yep.mjs

Found 1 error in dist/yep.mjs:1

But tsc says:

npx tsc --listFiles
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/typescript@5.7.3/node_modules/typescript/lib/lib.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/typescript@5.7.3/node_modules/typescript/lib/lib.es5.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/typescript@5.7.3/node_modules/typescript/lib/lib.dom.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/typescript@5.7.3/node_modules/typescript/lib/lib.webworker.importscripts.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/typescript@5.7.3/node_modules/typescript/lib/lib.scripthost.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/typescript@5.7.3/node_modules/typescript/lib/lib.decorators.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/node_modules/.pnpm/typescript@5.7.3/node_modules/typescript/lib/lib.decorators.legacy.d.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/src/yep.ts
/home/jabaile/work/repros/tsgo-repro-dist-exclude/dist/yep.mjs

Seemingly, we are checking a file we shouldn't. Could be related to #931.

[jakebailey]

The issue is just that getSemanticDiagnosticsForFile is mishandling unused directives when checkJS is off.