CRAP score for node native coverage

[RWOverdijk]

Probably a silly question to ask because it is experimental, but does fallow support coverage from node --test --experimental-test-coverage? This makes LCOV.

[BartWaardenburg]

Not directly at the moment. --experimental-test-coverage gives a terminal table or LCOV, and fallow health --coverage reads Istanbul JSON (coverage-final.json).

Both use the same V8 coverage underneath. Set NODE_V8_COVERAGE so Node keeps that data in a folder, then convert it with c8:

NODE_V8_COVERAGE=./v8-coverage node --test
npx c8 report --reporter=json --temp-directory ./v8-coverage
fallow health --coverage coverage/coverage-final.json

You do not need --experimental-test-coverage for this. Keep it if you also want Node's own coverage table in the terminal.

#2906 tracks support for the V8 folder as direct input, without c8. That gives more precise per-function numbers than the line-based conversion. Thanks for asking, and thanks for pointing us toward direct V8 coverage support!

[RWOverdijk]

I was using c8, just hoping for something different secretly 😄 thanks