fix: Keep CLI coverage output when using --json with --outputFile (#15918)

notoriousmango · web-flow · commit a6ce37ec1fda · 2026-01-21T20:55:34.000+09:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -12,6 +12,7 @@
 - `[jest-runtime]` Fix issue where user cannot utilize dynamic import despite specifying `--experimental-vm-modules` Node option ([#15842](https://github.com/jestjs/jest/pull/15842))
 - `[jest-test-sequencer]` Fix issue where failed tests due to compilation errors not getting re-executed even with `--onlyFailures` CLI option ([#15851](https://github.com/jestjs/jest/pull/15851))
 - `[jest-util]` Make sure `process.features.require_module` is `false` ([#15867](https://github.com/jestjs/jest/pull/15867))
+- `[jest-config]` Keep CLI coverage output when using `--json` with `--outputFile` ([#15918](https://github.com/jestjs/jest/pull/15918))
 
 ### Chore & Maintenance
 
diff --git a/e2e/__tests__/__snapshots__/coverageReport.test.ts.snap b/e2e/__tests__/__snapshots__/coverageReport.test.ts.snap
@@ -138,3 +138,21 @@ Functions    : 50% ( 3/6 )
 Lines        : 60% ( 12/20 )
 ================================================================================"
 `;
+
+exports[`prints coverage when using --outputFile with --json 1`] = `
+"-------------------------------------|---------|----------|---------|---------|-------------------
+File                                 | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
+-------------------------------------|---------|----------|---------|---------|-------------------
+All files                            |      60 |        0 |      50 |      60 |                   
+ coverage-report                     |   47.36 |        0 |      25 |      50 |                   
+  file.js                            |     100 |      100 |     100 |     100 |                   
+  notRequiredInTestSuite.js          |       0 |        0 |       0 |       0 | 8-19              
+  otherFile.js                       |     100 |      100 |     100 |     100 |                   
+  sum.js                             |    87.5 |      100 |      50 |     100 |                   
+  sumDependency.js                   |       0 |        0 |       0 |       0 | 8-13              
+ coverage-report/cached-duplicates/a |     100 |      100 |     100 |     100 |                   
+  identical.js                       |     100 |      100 |     100 |     100 |                   
+ coverage-report/cached-duplicates/b |     100 |      100 |     100 |     100 |                   
+  identical.js                       |     100 |      100 |     100 |     100 |                   
+-------------------------------------|---------|----------|---------|---------|-------------------"
+`;
diff --git a/e2e/__tests__/coverageReport.test.ts b/e2e/__tests__/coverageReport.test.ts
@@ -189,3 +189,18 @@ test('generates coverage when using the testRegex config param ', () => {
   expect(stdout).toMatchSnapshot();
   expect(exitCode).toBe(0);
 });
+
+test('prints coverage when using --outputFile with --json', () => {
+  const outputFileName = 'sum.result.json';
+  const outputFilePath = path.join(DIR, outputFileName);
+
+  const {stdout, exitCode} = runJest(DIR, [
+    '--json',
+    `--outputFile=${outputFileName}`,
+    '--coverage',
+  ]);
+
+  expect(stdout).toMatchSnapshot();
+  expect(exitCode).toBe(0);
+  fs.unlinkSync(outputFilePath);
+});
diff --git a/packages/jest-config/src/__tests__/normalize.test.ts b/packages/jest-config/src/__tests__/normalize.test.ts
@@ -174,6 +174,20 @@ it('sets coverageReporters correctly when argv.json is set', async () => {
   expect(options.coverageReporters).toEqual(['json', 'lcov', 'clover']);
 });
 
+it('keeps text coverage reporter when argv.json and outputFile are set', async () => {
+  const {options} = await normalize(
+    {
+      rootDir: '/root/path/foo',
+    },
+    {
+      json: true,
+      outputFile: 'results.json',
+    } as Config.Argv,
+  );
+
+  expect(options.coverageReporters).toEqual(['json', 'text', 'lcov', 'clover']);
+});
+
 describe('rootDir', () => {
   it('throws if the options is missing a rootDir property', async () => {
     expect.assertions(1);
diff --git a/packages/jest-config/src/normalize.ts b/packages/jest-config/src/normalize.ts
@@ -1110,8 +1110,9 @@ export default async function normalize(
     newOptions.testMatch = [];
   }
 
-  // If argv.json is set, coverageReporters shouldn't print a text report.
-  if (argv.json) {
+  // If argv.json is set without an outputFile, coverageReporters shouldn't print
+  // a text report to avoid polluting the JSON written to stdout.
+  if (argv.json && !argv.outputFile) {
     newOptions.coverageReporters = (newOptions.coverageReporters || []).filter(
       reporter => reporter !== 'text',
     );
