How to collect test coverage including untested files?

[DanilAgafonov]

Is it possible to include untested files in coverage report?

Reason: I want to know how much code I have uncovered in my project overall. I want to see files for which I haven't created any tests and never imported them anywhere.

Example:
Let's say I have src/index.js file. And I run node --test --experimental-test-coverage --test-coverage-include="src/**/*" in the root of my project. My expectation: report should include index.js showing that zero lines covered with tests.

[nullswan]

Also interested ! I think this is related to nodejs/help#4487

[MoLow]

Coverage is collected using v8's takeCoverage method, which means it is only aware of code that has actually run.
this might be a feature that is possible to implement but it is impossible with the current implementation