Watch mode does not support inferred entry points

[Gerrit0]

I see a non making sense error log when running typedoc --watch:

[info] Starting compilation in watch mode...
[error] Unable to find any entry points. See previous warnings
[info] Found 0 errors. Watching for file changes.

Interesting things here are that:

1. "see previous warnings" but there are no previous warnings.
2. Such an error should make the command fail, but it doesn't.
3. Such a error log doesn't show up if I just run typedoc or typedoc --emit none.

Remember that, as said in comments above, I don't set entryPoints because I do rely on "typedoc" entry in "exports" field in package.json.

Originally posted by @ibc in #2898 (comment)