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Generating report error - cannot convert undefined or null to object

See original GitHub issue

I am also having issues with the latest v2.0.4 and I have a similar setup where I run jest and collect coverage in separate steps and then use ArtiomTr/jest-coverage-report-action for the annotations.

     - name: Jest coverage report
        uses: ArtiomTr/jest-coverage-report-action@v2.0.4
          github-token: ${{ secrets.GITHUB_TOKEN }}
          coverage-file: ./temp-coverage-results/current/jest.results.json
          base-coverage-file: ./temp-coverage-results/target/jest.results.json
          threshold: 80
          skip-step: all
          annotations: failed-tests

With v2.0.4 it keeps failing with TypeError: Cannot convert undefined or null to object and I am not sure how to debug it.

CleanShot 2022-03-04 at 13 46 25

Out of curiosity I tried to use ArtiomTr/jest-coverage-report-action@Debug-action instead (mentioned in another conversation) and with that particular version it works perfectly every time: branch in not switching, reports are being collected, annotation with coverage diffs is generated, etc…

I did some research but wasn’t able to figure out where the Debug-action version comes from… is it based on an older version?! @ArtiomTr

_Originally posted by @raspo in

Issue Analytics

  • State:closed
  • Created 2 years ago
  • Comments:13 (9 by maintainers)

github_iconTop GitHub Comments

nowyDEVcommented, Sep 28, 2022

This simple script does the job


const fs = require("fs");

  don't forget to update `coverage-file` input inside workflow when specifying path here
    coverage-file: ./coverage/report.json
const testReportFilename = process.cwd() + "/coverage/report.json"; 
const coverageReportFilename = process.cwd() + "/coverage/coverage-final.json";

const testReport = require(testReportFilename);
const coverageReport = require(coverageReportFilename);

testReport.coverageMap = coverageReport;

fs.writeFile(testReportFilename, JSON.stringify(testReport), (err) => {
  if (err) {

  console.log("Coverage report appended to " + testReportFilename);


  "scripts": {
    "test:coverage": "vitest run --coverage",
    "test:coverage:ci": "npm run test:coverage -- --outputFile ./coverage/report.json && ./scripts/save-test-coverage.js",
raspocommented, Apr 13, 2022

Makes sense 👌 Personally, I got confused by the name of the two properties: base-coverage-file and coverage-file, thinking that just providing the coverage file should be ok. We may wanna rename them to something that conveys the idea that this is the full json test report file (like base-json-test-report or base-json-output-file) … although it’s probably not a good idea as it will require a breaking change.

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