Coverage report is missing uncovered files when using --all with --include #588

Activity

1. JBallin commented on Oct 11, 2026

   

   JBallin

   on Oct 11, 2026

   More actions

   I found another case that #589 fixes: with --all, c8 adds empty coverage for an executed file when its coverage entry uses an absolute path instead of a file:// URL. I reproduced this with c8 12.0.0 and verified that #589 handles both formats correctly. Could the absolute-path case be included in the regression tests?

   Runnable reproduction

   Save this as repro.cjs in an isolated directory with c8 available, then run node repro.cjs:

   const fs = require('node:fs');
   const path = require('node:path');
   const { pathToFileURL } = require('node:url');
   const createReport = require('c8/lib/report.js');
   
   const source = 'function answer() { return 42; }\nanswer();\n';
   const filename = path.resolve('subject.cjs');
   fs.writeFileSync(filename, source);
   
   for (const kind of ['absolute', 'file-url']) {
     const report = createReport({
       all: true, src: [process.cwd()],
       include: ['subject.cjs'], exclude: [], extension: ['.cjs']
     });
     const index = new Set();
     const normalized = report._normalizeProcessCov({
       result: [{
         scriptId: '1',
         url: kind === 'absolute' ? filename : pathToFileURL(filename).href,
         functions: [{
           functionName: '', isBlockCoverage: true,
           ranges: [{ startOffset: 0, endOffset: source.length, count: 1 }]
         }]
       }]
     }, index);
     console.log(kind, JSON.stringify({
       accepted: normalized.result.length,
       indexed: index.has(filename),
       emptyReports: report._includeUncoveredFiles(index).length
     }));
   }

   Actual output with c8 12.0.0:

   absolute {"accepted":1,"indexed":false,"emptyReports":1}
   file-url {"accepted":1,"indexed":true,"emptyReports":0}
   

   Expected: both accepted identities should be indexed, with zero empty reports for this executed file.