🛠️ Repo: Mocha's integration tests fail locally, and then tests won't run at all afterward

[jdmarshall]

Bug Report Checklist

• I have read and agree to Mocha's Code of Conduct and Contributing Guidelines
• I have searched for related issues and issues with the faq label, but none matched my issue.
• I have 'smoke tested' the code to be tested by running it outside the real test suite to get a better sense of whether the problem is in the code under test, my usage of Mocha, or Mocha itself.
• I want to provide a PR to resolve this

Expected

Trying to run 'npm run test' locally in order to possibly create a PR to fix another issue:

333 passing (2m)
1 pending
3 failing

...

And then all subsequent runs of the tests don't even start, even after an 'npm run clean'. For some reason nuking node_modules and starting over makes it work again.

Actual

  333 passing (2m)
  1 pending
  3 failing

  1) esm
       should throw an ERR_MODULE_NOT_FOUND and not ERR_REQUIRE_ESM if file imports a non-existing module:
     
expected '\n Exception during run: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/esm/type-module/test-that-imports-non-existing-module.fixture.js in a cycle. (from /Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js)\n    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:309:15)\n    at loadESMFromCJS (node:internal/modules/cjs/loader:1371:24)\n    at Module._compile (node:internal/modules/cjs/loader:1511:5)\n    at Module.replacementCompile (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:60:13)\n    at Module._extensions..js (node:internal/modules/cjs/loader:1572:16)\n    at Object.<anonymous> (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:64:4)\n    at Module.load (node:internal/modules/cjs/loader:1275:32)\n    at Module._load (node:internal/modules/cjs/loader:1096:12)\n    at Module.require (node:internal/modules/cjs/loader:1298:19)\n    at require (node:internal/modules/helpers:182:18)\n    at exports.requireOrImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:10:8)\n    at async exports.loadFilesAsync (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:21:688)\n    at async singleRun (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run-helpers.js:55:25)\n    at async exports.handler (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run.js:19:457) {\n  code: \'ERR_REQUIRE_CYCLE_MODULE\'\n}\n'
to contain 'ERR_MODULE_NOT_FOUND'


 Exception during run: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/esm/type-module/test-that-imports-non-existing-module.fixture.js in a cycle. (from /Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js)
    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:309:15)
    at loadESMFromCJS (node:internal/modules/cjs/loader:1371:24)
    at Module._compile (node:internal/modules/cjs/loader:1511:5)
    at Module.replacementCompile (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:60:13)
    at Module._extensions..js (node:internal/modules/cjs/loader:1572:16)
    at Object.<anonymous> (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:64:4)
    at Module.load (node:internal/modules/cjs/loader:1275:32)
    at Module._load (node:internal/modules/cjs/loader:1096:12)
    at Module.require (node:internal/modules/cjs/loader:1298:19)
    at require (node:internal/modules/helpers:182:18)
    at exports.requireOrImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:10:8)
    at async exports.loadFilesAsync (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:21:688)
    at async singleRun (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run-helpers.js:55:25)
    at async exports.handler (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run.js:19:457) {
  code: 'ERR_REQUIRE_CYCLE_MODULE'
}


  UnexpectedError: 
  expected '\n Exception during run: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/esm/type-module/test-that-imports-non-existing-module.fixture.js in a cycle. (from /Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js)\n    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:309:15)\n    at loadESMFromCJS (node:internal/modules/cjs/loader:1371:24)\n    at Module._compile (node:internal/modules/cjs/loader:1511:5)\n    at Module.replacementCompile (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:60:13)\n    at Module._extensions..js (node:internal/modules/cjs/loader:1572:16)\n    at Object.<anonymous> (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:64:4)\n    at Module.load (node:internal/modules/cjs/loader:1275:32)\n    at Module._load (node:internal/modules/cjs/loader:1096:12)\n    at Module.require (node:internal/modules/cjs/loader:1298:19)\n    at require (node:internal/modules/helpers:182:18)\n    at exports.requireOrImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:10:8)\n    at async exports.loadFilesAsync (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:21:688)\n    at async singleRun (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run-helpers.js:55:25)\n    at async exports.handler (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run.js:19:457) {\n  code: \'ERR_REQUIRE_CYCLE_MODULE\'\n}\n'
  to contain 'ERR_MODULE_NOT_FOUND'
  
  
   Exception during run: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/esm/type-module/test-that-imports-non-existing-module.fixture.js in a cycle. (from /Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js)
      at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:309:15)
      at loadESMFromCJS (node:internal/modules/cjs/loader:1371:24)
      at Module._compile (node:internal/modules/cjs/loader:1511:5)
      at Module.replacementCompile (node_modules/append-transform/index.js:60:13)
      at Module._extensions..js (node:internal/modules/cjs/loader:1572:16)
      at Object.<anonymous> (node_modules/append-transform/index.js:64:4)
      at Module.load (node:internal/modules/cjs/loader:1275:32)
      at Module._load (node:internal/modules/cjs/loader:1096:12)
      at Module.require (node:internal/modules/cjs/loader:1298:19)
      at require (node:internal/modules/helpers:182:18)
      at exports.requireOrImport (lib/nodejs/esm-utils.js:10:8)
      at async exports.loadFilesAsync (lib/nodejs/esm-utils.js:21:688)
      at async singleRun (lib/cli/run-helpers.js:55:25)
      at async exports.handler (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run.js:19:457) {
    code: 'ERR_REQUIRE_CYCLE_MODULE'
  }
  
  
      at Context.<anonymous> (test/integration/esm.spec.js:79:5)
      set UNEXPECTED_FULL_TRACE=true to see the full stack trace

  2) root hooks
       when mocha run in serial mode
         support ESM via .js extension w/o type=module
           should fail due to ambiguous file type
             with --no-experimental-detect-module:
     
expected Promise when fulfilled to contain output /SyntaxError: Unexpected token/
  expected
  {
    output: '\n✖ ERROR: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js in a cycle.\n    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:309:15)\n    at loadESMFromCJS (node:internal/modules/cjs/loader:1371:24)\n    at Module._compile (node:internal/modules/cjs/loader:1511:5)\n    at Module.replacementCompile (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:60:13)\n    at Module._extensions..js (node:internal/modules/cjs/loader:1613:10)\n    at Object.<anonymous> (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:64:4)\n    at Module.load (node:internal/modules/cjs/loader:1275:32)\n    at Module._load (node:internal/modules/cjs/loader:1096:12)\n    at cjsLoader (node:internal/modules/esm/translators:298:15)\n    at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:240:7)\n    at ModuleJob.run (node:internal/modules/esm/module_job:263:25)\n    at async ModuleLoader.import (node:internal/modules/esm/loader:540:24)\n    at async formattedImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:2:577)\n    at async exports.requireOrImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:7:1135)\n    at async exports.handleRequires (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run-helpers.js:38:364)\n    at async /Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run.js:18:41 {\n  code: \'ERR_REQUIRE_CYCLE_MODULE\'\n}\n',
    code: 1,
    args: [
      '/Users/jasonmarshall/Projects/cobbler/mocha/bin/mocha.js',
      '--require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js',
      '--no-experimental-detect-module',
      '--no-color',
      '--no-bail',
      '--no-parallel'
    ],
    command: '/Users/jasonmarshall/Projects/cobbler/mocha/bin/mocha.js --require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js --no-experimental-detect-module --no-color --no-bail --no-parallel'
  }
  to contain output /SyntaxError: Unexpected token/

  
  expected Promise when fulfilled to contain output /SyntaxError: Unexpected token/
    expected
    {
      output: '\n✖ ERROR: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js in a cycle.\n    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:309:15)\n    at loadESMFromCJS (node:internal/modules/cjs/loader:1371:24)\n    at Module._compile (node:internal/modules/cjs/loader:1511:5)\n    at Module.replacementCompile (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:60:13)\n    at Module._extensions..js (node:internal/modules/cjs/loader:1613:10)\n    at Object.<anonymous> (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:64:4)\n    at Module.load (node:internal/modules/cjs/loader:1275:32)\n    at Module._load (node:internal/modules/cjs/loader:1096:12)\n    at cjsLoader (node:internal/modules/esm/translators:298:15)\n    at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:240:7)\n    at ModuleJob.run (node:internal/modules/esm/module_job:263:25)\n    at async ModuleLoader.import (node:internal/modules/esm/loader:540:24)\n    at async formattedImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:2:577)\n    at async exports.requireOrImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:7:1135)\n    at async exports.handleRequires (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run-helpers.js:38:364)\n    at async /Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run.js:18:41 {\n  code: \'ERR_REQUIRE_CYCLE_MODULE\'\n}\n',
      code: 1,
      args: [
        '--require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js',
        '--no-experimental-detect-module',
        '--no-color',
        '--no-bail',
        '--no-parallel'
      ],
    }
    to contain output /SyntaxError: Unexpected token/
      at Array.forEach (<anonymous>)
  From previous event:
      at Context.<anonymous> (test/integration/plugins/root-hooks.spec.js:146:18)
      at callFn (lib/runnable.js:112:584)
      at Runnable.run (lib/runnable.js:112:57)
      at Runner.runTest (lib/runner.js:220:1054)
      at /Users/jasonmarshall/Projects/cobbler/mocha/lib/runner.js:248:654
      at next (lib/runner.js:197:422)
      at /Users/jasonmarshall/Projects/cobbler/mocha/lib/runner.js:197:809
      at next (lib/runner.js:185:579)
      at Immediate.<anonymous> (lib/runner.js:189:1253)
      at process.processImmediate (node:internal/timers:483:21)
      set UNEXPECTED_FULL_TRACE=true to see the full stack trace

  3) root hooks
       when mocha run in serial mode
         support ESM via .js extension w/o type=module
           should fail due to ambiguous file type
             with --experimental-detect-module:
     
expected Promise when fulfilled to contain output /SyntaxError: Unexpected token/
  expected
  {
    output: '\n✖ ERROR: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js in a cycle.\n    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:309:15)\n    at loadESMFromCJS (node:internal/modules/cjs/loader:1371:24)\n    at Module._compile (node:internal/modules/cjs/loader:1511:5)\n    at Module.replacementCompile (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:60:13)\n    at Module._extensions..js (node:internal/modules/cjs/loader:1613:10)\n    at Object.<anonymous> (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:64:4)\n    at Module.load (node:internal/modules/cjs/loader:1275:32)\n    at Module._load (node:internal/modules/cjs/loader:1096:12)\n    at cjsLoader (node:internal/modules/esm/translators:298:15)\n    at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:240:7)\n    at ModuleJob.run (node:internal/modules/esm/module_job:263:25)\n    at async ModuleLoader.import (node:internal/modules/esm/loader:540:24)\n    at async formattedImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:2:577)\n    at async exports.requireOrImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:7:1135)\n    at async exports.handleRequires (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run-helpers.js:38:364)\n    at async /Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run.js:18:41 {\n  code: \'ERR_REQUIRE_CYCLE_MODULE\'\n}\n',
    code: 1,
    args: [
      '/Users/jasonmarshall/Projects/cobbler/mocha/bin/mocha.js',
      '--require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js',
      '--experimental-detect-module',
      '--no-color',
      '--no-bail',
      '--no-parallel'
    ],
    command: '/Users/jasonmarshall/Projects/cobbler/mocha/bin/mocha.js --require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js --experimental-detect-module --no-color --no-bail --no-parallel'
  }
  to contain output /SyntaxError: Unexpected token/

  
  expected Promise when fulfilled to contain output /SyntaxError: Unexpected token/
    expected
    {
      output: '\n✖ ERROR: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js in a cycle.\n    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:309:15)\n    at loadESMFromCJS (node:internal/modules/cjs/loader:1371:24)\n    at Module._compile (node:internal/modules/cjs/loader:1511:5)\n    at Module.replacementCompile (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:60:13)\n    at Module._extensions..js (node:internal/modules/cjs/loader:1613:10)\n    at Object.<anonymous> (/Users/jasonmarshall/Projects/cobbler/mocha/node_modules/append-transform/index.js:64:4)\n    at Module.load (node:internal/modules/cjs/loader:1275:32)\n    at Module._load (node:internal/modules/cjs/loader:1096:12)\n    at cjsLoader (node:internal/modules/esm/translators:298:15)\n    at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:240:7)\n    at ModuleJob.run (node:internal/modules/esm/module_job:263:25)\n    at async ModuleLoader.import (node:internal/modules/esm/loader:540:24)\n    at async formattedImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:2:577)\n    at async exports.requireOrImport (/Users/jasonmarshall/Projects/cobbler/mocha/lib/nodejs/esm-utils.js:7:1135)\n    at async exports.handleRequires (/Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run-helpers.js:38:364)\n    at async /Users/jasonmarshall/Projects/cobbler/mocha/lib/cli/run.js:18:41 {\n  code: \'ERR_REQUIRE_CYCLE_MODULE\'\n}\n',
      code: 1,
      args: [
        '--require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js',
        '--experimental-detect-module',
        '--no-color',
        '--no-bail',
        '--no-parallel'
      ],
    }
    to contain output /SyntaxError: Unexpected token/
      at Array.forEach (<anonymous>)
  From previous event:
      at Context.<anonymous> (test/integration/plugins/root-hooks.spec.js:166:18)
      at callFn (lib/runnable.js:112:584)
      at Runnable.run (lib/runnable.js:112:57)
      at Runner.runTest (lib/runner.js:220:1054)
      at /Users/jasonmarshall/Projects/cobbler/mocha/lib/runner.js:248:654
      at next (lib/runner.js:197:422)
      at /Users/jasonmarshall/Projects/cobbler/mocha/lib/runner.js:197:809
      at next (lib/runner.js:185:579)
      at Immediate.<anonymous> (lib/runner.js:189:1253)
      at process.processImmediate (node:internal/timers:483:21)
      set UNEXPECTED_FULL_TRACE=true to see the full stack trace



ERROR: "test-node:integration" exited with 3.
ERROR: "test-node" exited with 1.


npm run test

> mocha@11.6.0 test
> run-s lint test-node test-browser


> mocha@11.6.0 lint
> run-p lint:*


> mocha@11.6.0 lint:installed-check
> installed-check --engine-check


> mocha@11.6.0 lint:markdown
> markdownlint "*.md" "docs/**/*.md" ".github/*.md" "lib/**/*.md" "test/**/*.md" "example/**/*.md" -i CHANGELOG.md


> mocha@11.6.0 lint:code
> eslint . "bin/*" --max-warnings 0


> mocha@11.6.0 lint:knip
> knip --cache

Unused files (1)
lib/nodejs/worker.js
Configuration issues (1)
Unused item in ignoreDependencies: prettier
ERROR: "lint:knip" exited with 1.
ERROR: "lint" exited with 1.

Minimal, Reproducible Example

Clone the repo and run 'npm i' locally.

If there's something else I'm supposed to be doing, it's not in the developer documents.

Versions

11.6.0

v20.19.0, but also fails on 22

Additional Info

No response

[jdmarshall]

The tests that fail seem to be consistent. On macOS Sonoma 14.7.4 (23H420)

[JoshuaKGoldberg]

I took a long look at this as a part of the bugs around the 11.7.0 require(esm) issues (#5380, etc). It's deterministic on my machine that root-hooks.spec.js > --experimental-detect-module test(s) fail. I don't reproduce the other test failures in this issue.

All tested Node.js versions hang locally for me for up to a minute or so. Eventually the process exits.

Each test command is consistently giving me the same report when run multiple times in a row. But, the report is dependent on the Node.js version. This all happens both with:

• Running all integration tests: npm run test-node:integration
• Running directly: npx mocha test/integration/plugins/root-hooks.spec.js

Node.js	--experimental-detect-module?	require(esm)?	npm run test-node:integration	npx mocha ...
20.9.0			SyntaxError: Unexpected token \'export\' 🍎	SyntaxError: Unexpected token \'export\' 🍎
20.19.0		yes	\n\n 0 passing (0ms)\n\n'	SyntaxError: Unexpected token \'export\' 🍎
22.10.0	yes		Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module 🍌	SyntaxError: Unexpected token \'export\' 🍎
22.12.0	yes	yes	\n\n 0 passing (0ms)\n\n'	SyntaxError: Unexpected token \'export\' 🍎
24.2.0	yes	yes	\n\n 0 passing (0ms)\n\n'	SyntaxError: Unexpected token \'export\' 🌸

The only difference between 🍎 and 🌸 is the text of the logged Node.js warning.

🍎's full logged test output

(node:70113) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)

✖ ERROR: /Users/josh/repos/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js:1
export const mochaHooks = {
^^^^^^

  SyntaxError: Unexpected token \'export\'
      at internalCompileFunction (node:internal/vm:73:18)
      at wrapSafe (node:internal/modules/cjs/loader:1153:20)
      at Module._compile (node:internal/modules/cjs/loader:1205:27)
      at Module.replacementCompile (/Users/josh/repos/mocha/node_modules/append-transform/index.js:60:13)
      at Module._extensions..js (node:internal/modules/cjs/loader:1295:10)
      at Object.<anonymous> (/Users/josh/repos/mocha/node_modules/append-transform/index.js:64:4)
      at Module.load (node:internal/modules/cjs/loader:1091:32)
      at Module._load (node:internal/modules/cjs/loader:938:12)
      at cjsLoader (node:internal/modules/esm/translators:284:17)
      at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:234:7)
      at ModuleJob.run (node:internal/modules/esm/module_job:217:25)
      at async ModuleLoader.import (node:internal/modules/esm/loader:316:24)
      at async importModuleDynamicallyWrapper (node:internal/vm/module:431:15)
      at async formattedImport (/Users/josh/repos/mocha/lib/nodejs/esm-utils.js:2:563)
      at async tryImportAndRequire (/Users/josh/repos/mocha/lib/nodejs/esm-utils.js:11:357)
      at async exports.handleRequires (/Users/josh/repos/mocha/lib/cli/run-helpers.js:38:372)
      at async /Users/josh/repos/mocha/lib/cli/run.js:18:41

🍌's full logged test output

✖ ERROR: Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module /Users/josh/repos/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js in a cycle.
    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:311:15)
    at loadESMFromCJS (node:internal/modules/cjs/loader:1381:24)
    at Module._compile (node:internal/modules/cjs/loader:1503:5)
    at Module.replacementCompile (/Users/josh/repos/mocha/node_modules/append-transform/index.js:60:13)
    at node:internal/modules/cjs/loader:1689:10
    at Object.<anonymous> (/Users/josh/repos/mocha/node_modules/append-transform/index.js:64:4)
    at Module.load (node:internal/modules/cjs/loader:1318:32)
    at Function._load (node:internal/modules/cjs/loader:1128:12)
    at TracingChannel.traceSync (node:diagnostics_channel:315:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:218:24)
    at cjsLoader (node:internal/modules/esm/translators:263:5)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:196:7)
    at ModuleJob.run (node:internal/modules/esm/module_job:268:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:543:26)
    at async formattedImport (/Users/josh/repos/mocha/lib/nodejs/esm-utils.js:2:563)
    at async tryImportAndRequire (/Users/josh/repos/mocha/lib/nodejs/esm-utils.js:11:357)
    at async exports.handleRequires (/Users/josh/repos/mocha/lib/cli/run-helpers.js:38:372)
    at async /Users/josh/repos/mocha/lib/cli/run.js:18:41 {

🌸's full logged test output

(node:81463) Warning: Failed to load the ES module: /Users/josh/repos/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js. Make sure to set "type": "module" in the nearest package.json file or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)

✖ ERROR: /Users/josh/repos/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js:1
export const mochaHooks = {
^^^^^^

  SyntaxError: Unexpected token \'export\'
      at wrapSafe (node:internal/modules/cjs/loader:1666:18)
      at Module._compile (node:internal/modules/cjs/loader:1708:20)
      at Object..js (node:internal/modules/cjs/loader:1899:10)
      at Module.load (node:internal/modules/cjs/loader:1469:32)
      at Module._load (node:internal/modules/cjs/loader:1286:12)
      at TracingChannel.traceSync (node:diagnostics_channel:322:14)
      at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
      at Module.require (node:internal/modules/cjs/loader:1491:12)
      at require (node:internal/modules/helpers:135:16)
      at requireModule (/Users/josh/repos/mocha/lib/nodejs/esm-utils.js:94:12)
      at exports.handleRequires (/Users/josh/repos/mocha/lib/cli/run-helpers.js:97:34)
      at async /Users/josh/repos/mocha/lib/cli/run.js:358:25

[jdmarshall]

@JoshuaKGoldberg Now they fail for a completely different reason. How are you guys running the tests? I'm baffled why the PR builds are succeeding.

  1) root hooks
       when mocha run in serial mode
         support ESM via .js extension w/o type=module
           should fail due to ambiguous file type
             with --no-experimental-detect-module:
     
expected Promise when fulfilled to contain output /SyntaxError: Unexpected token/
  expected
  {
    output: '\n\n  0 passing (1ms)\n\n',
    code: 0,
    args: [
      '/Users/jasonmarshall/Projects/cobbler/mocha/bin/mocha.js',
      '--require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js',
      '--no-experimental-detect-module',
      '--no-color',
      '--no-bail',
      '--no-parallel'
    ],
    command: '/Users/jasonmarshall/Projects/cobbler/mocha/bin/mocha.js --require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js --no-experimental-detect-module --no-color --no-bail --no-parallel'
  }
  to contain output /SyntaxError: Unexpected token/

  
  expected Promise when fulfilled to contain output /SyntaxError: Unexpected token/
    expected
    {
      output: '\n\n  0 passing (1ms)\n\n',
      code: 0,
      args: [
        '--require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js',
        '--no-experimental-detect-module',
        '--no-color',
        '--no-bail',
        '--no-parallel'
      ],
    }
    to contain output /SyntaxError: Unexpected token/
      at Array.forEach (<anonymous>)
  From previous event:
      at Context.<anonymous> (test/integration/plugins/root-hooks.spec.js:146:18)
      at callFn (lib/runnable.js:112:584)
      at Runnable.run (lib/runnable.js:112:57)
      at Runner.runTest (lib/runner.js:220:1054)
      at /Users/jasonmarshall/Projects/cobbler/mocha/lib/runner.js:248:654
      at next (lib/runner.js:197:422)
      at /Users/jasonmarshall/Projects/cobbler/mocha/lib/runner.js:197:809
      at next (lib/runner.js:185:579)
      at Immediate.<anonymous> (lib/runner.js:189:1253)
      at process.processImmediate (node:internal/timers:483:21)
      set UNEXPECTED_FULL_TRACE=true to see the full stack trace

  2) root hooks
       when mocha run in serial mode
         support ESM via .js extension w/o type=module
           should fail due to ambiguous file type
             with --experimental-detect-module:
     
expected Promise when fulfilled to contain output /SyntaxError: Unexpected token/
  expected
  {
    output: '\n\n  0 passing (1ms)\n\n',
    code: 0,
    args: [
      '/Users/jasonmarshall/Projects/cobbler/mocha/bin/mocha.js',
      '--require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js',
      '--experimental-detect-module',
      '--no-color',
      '--no-bail',
      '--no-parallel'
    ],
    command: '/Users/jasonmarshall/Projects/cobbler/mocha/bin/mocha.js --require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js --experimental-detect-module --no-color --no-bail --no-parallel'
  }
  to contain output /SyntaxError: Unexpected token/

  
  expected Promise when fulfilled to contain output /SyntaxError: Unexpected token/
    expected
    {
      output: '\n\n  0 passing (1ms)\n\n',
      code: 0,
      args: [
        '--require=/Users/jasonmarshall/Projects/cobbler/mocha/test/integration/fixtures/plugins/root-hooks/root-hook-defs-esm-broken.fixture.js',
        '--experimental-detect-module',
        '--no-color',
        '--no-bail',
        '--no-parallel'
      ],
    }
    to contain output /SyntaxError: Unexpected token/
      at Array.forEach (<anonymous>)
  From previous event:
      at Context.<anonymous> (test/integration/plugins/root-hooks.spec.js:166:18)
      at callFn (lib/runnable.js:112:584)
      at Runnable.run (lib/runnable.js:112:57)
      at Runner.runTest (lib/runner.js:220:1054)
      at /Users/jasonmarshall/Projects/cobbler/mocha/lib/runner.js:248:654
      at next (lib/runner.js:197:422)
      at /Users/jasonmarshall/Projects/cobbler/mocha/lib/runner.js:197:809
      at next (lib/runner.js:185:579)
      at Immediate.<anonymous> (lib/runner.js:189:1253)
      at process.processImmediate (node:internal/timers:483:21)
      set UNEXPECTED_FULL_TRACE=true to see the full stack trace

[JoshuaKGoldberg]

I'm running npm run test locally, after npm i. How are you?

---

Aside: I edited your comment to put ```s fenced code blocks around the pasted terminal text. It's a little easier to read. 🙂

[jdmarshall]

Same.

On Mac if that matters.

What version of node?

[JoshuaKGoldberg]

Me too, Ventura 13.2.

[jdmarshall]

This is weird. I don’t think I have anything installed globally (and use nvm anyway)

[JoshuaKGoldberg]

@mochajs/committers is anybody else seeing this? 🫠

[mark-wiemer]

I'll assign myself as a reminder but no promises. Still catching up after my break but I do love fixing tests. Plus I have a Windows / Linux dualboot machine so that should bring pros and cons. No Mac available for me