`tsc -b` fails before it builds anything:
error TS18003: No inputs were found in config file 'tsconfig.node.json'.
Specified 'include' paths were '["build/**/*.mjs"]' and 'exclude' paths
were '[]'.
Editors report the same error against the file directly, which is where it
is usually met.
The include names ten files that exist, but TypeScript only takes `.mjs`
as an input when `allowJs` is on, and it is not. So the referenced project
has no inputs and cannot have any, which a composite project may not.
`allowJs` is not the fix. Turning it on with `checkJs` surfaces 20 errors
in build scripts nobody asked TypeScript to check, and turning it on
without `checkJs` only produces declarations for build tooling. Either is
a policy change, not a repair.
`build/` has never held a `.ts` file. What the root config does not cover
is `playwright.config.ts` -- its include is `packages/*/src/**` and
`tests/e2e/**` -- and a node-side config file is what a `tsconfig.node.json`
exists for. Pointing the include there gives the project real inputs and
type-checks a file that was unchecked.
Composite implies declaration emit, so the output goes to `.tmp/`, which is
already ignored, instead of dropping `playwright.config.js` and a `.d.ts`
next to the source.
`npm run typecheck` is unaffected: it runs `tsc --noEmit`, which never
built this reference, which is why the repo has been green with it broken.
TypeScript 6 reports it as an error:
Option 'baseUrl' is deprecated and will stop functioning in TypeScript 7.0.
Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
The repo pins typescript 5.9.3, so the current typecheck is quiet, but an
editor running a newer TypeScript flags it, and it becomes a hard failure
whenever the pin moves to 7.
In both configs baseUrl only anchors `paths`, and `paths` has not needed
it since TypeScript 4.4 — entries resolve relative to the tsconfig that
declares them. Every path here is already written relatively
("./packages/…", "./src/*"), so removing the line is the whole change.
Chose this over `"ignoreDeprecations": "6.0"`: that key silences the
message for one major version and has to be revisited, while this makes
the configs correct.
Nothing relies on baseUrl for bare-specifier resolution — there are no
`from "packages/…"` or `from "src/…"` imports under packages/*/src or
tests/e2e.
Verified with the repo's own typescript:
tsconfig.json 0 errors before, 0 after (234 files import via
@ccr/* or @/*, so a broken alias could not be silent)
tsconfig.node.json 1 error before, 1 after, byte-identical output —
a pre-existing TS18003 (its include is
"build/**/*.mjs" and allowJs is off), untouched here.
Re-checked both under TypeScript 6.0.3: the deprecation is gone and no new
diagnostic replaces it.
musi