Empty report on a file with multiple sources

[luixo]

Hello,
I'm building 100% coverage for my frontend.
And it seems like (empty-report) directive applies only to this.covSource[0] (or the one that matches by path), so if I map my source to multiple files - I cannot mark all of them as empty.

Details:
I run next.js build, run frontend tests on it and record coverage via Playwright's startJSCoverage. As I want to include all the files been built to get the 100% coverage, I read the whole build folder, tinker around with sourcemaps (kudos to playwright-coverage package) - and voila - I get all my files in the report.
The only problem I got is that report indicates all statements as run exactly once.
Eventually I tracked it down to generation of CovLine with count equals 1 to push it down to 0 later and magic (empty-report) function name.

The object I pass to applyCoverage looks like this:

[{
    ranges: [{
        startOffset: 0,
        endOffset: Infinity,
        count: 0,
    }],
    functionName: '(empty-report)',
    isBlockCoverage: true
}]

Unfortunately, this line picks only one covSource to apply empty report to.

I applied a patch to that piece to accomplish empty report for all the covSources:

applyCoverage (blocks) {
  blocks.forEach(block => {
+   if (block.functionName === '(empty-report)') {
+     this.covSources.forEach((covSource) => covSource.source.lines.forEach((line) => {
+       line.count = 0
+       return true
+     }));
+   }
    block.ranges.forEach((range, i) => {
      const { startCol, endCol, path, covSource } = this._maybeRemapStartColEndCol(range)

Is there a way around it or my patch looks good and we should include it in the repo?