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Empty code coverage on transpiled JS code #558
Description
I am inside a folder that has the below structure
src/ -> this has *.js and *.js.map
test/ -> this has *.js and *.js.map
I run the command c8@10.1.3/node_modules/c8/bin/c8.js --include src//*.js mocha@11.1.0/node_modules/mocha/bin/mocha.js test/unit//*.js --verbose
It does the tests but my coverage report says 0
----------|---------|----------|---------|---------|-------------------
| File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
|---|---|---|---|---|---|
| All files | 0 | 0 | 0 | 0 | |
| ---------- | --------- | ---------- | --------- | --------- | ------------------- |
=============================== Coverage summary ===============================
Statements : Unknown% ( 0/0 )
Branches : Unknown% ( 0/0 )
Functions : Unknown% ( 0/0 )
Lines : Unknown% ( 0/0 )
I tried --src src as well. But nothing worked. Does C8 work for transpiled JS code? How do I debug the above problem?
Activity
bcoe commentedon May 1, 2025
@gpradeepjain could you provide a repository with a minimal reproduction please 👏
kuba-orlik commentedon Jul 21, 2025
In my case the coverage showed as empty if I killed the running process with ctrl+C. If I run
process.exit(0)to terminate the js script, then everything gets picked up