X_TEST_BARE_ERROR
Means
a test reports its own verdict by throwing a bare Error
Typical cause
CLAUDE.md says never throw a bare Error and checkErrorFixes skips test files, so in tests the rule was prose — 422 sites accumulated under a green gate, up from 295 when the issue was opened. A ratchet per package: the count may fall and may never rise. A new Error handed to the code under test is input, not a verdict, and is never reported
Fix
replace the throw the finding names with expect.unreachable('<what was expected>') — its never return also narrows the variable, so the cast below it goes away