Newly added files not registered as belonging to composite projects

[mntnoe]

TypeScript Version: 3.8-rc to 4.0.0-dev.20200608

Search Terms:
composite, watch directories

Code

git clone https://github.com/mntnoe/ts-build-repro/
cd ts-build-repro
node build-watch

The node script will invoke the TS solution builder API to watch the src project, then add and import a file to it.

Also check out the scenario using a watch program (program-watch.js), as the error is displayed briefly in this case.

Expected behavior:
Project recompiles successfully.

Actual behavior:
Project fails with src/main.ts(2,8): error TS6307: File '.../ts-build-repro/src/bar.ts' is not listed within the file list of project '.../ts-build-repro/src/tsconfig.json'. Projects must list all files or use an 'include' pattern.

Related Issues:

I believe the issue was introduced by #35615, as the issue started with TS 3.8. Adding watchDirectories: false works around the problem.

[sheetalkamat]

Fixed by #39030