[Bug]: Module cache already has entry - /node_modules/yargs/build/lib/parse-command.js.

[bameyrick]

Version

28.1.2

Steps to reproduce

1. Clone https://github.com/bameyrick/iso-3166-1-flags-sprite-generator.git
2. Checkout branch yargs
3. Run npm i
4. Run npm run fetch
5. Run npm run test
6. Tests will fail with the error:

 Module cache already has entry /iso-3166-1-flags-sprite-generator/node_modules/yargs/build/lib/parse-command.js. This is a bug in Jest, please report it!

      at invariant (node_modules/jest-runtime/build/index.js:2591:11)
          at async Promise.all (index 4)
          at async Promise.all (index 5)

Expected behavior

Jest should be able to run both sets of tests

Actual behavior

Module cache already has entry /iso-3166-1-flags-sprite-generator/node_modules/yargs/build/lib/parse-command.js. This is a bug in Jest, please report it! error thrown

Additional context

No response

Environment

System:
    OS: macOS 12.4
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
  Binaries:
    Node: 16.15.1 - ~/.nvm/versions/node/v16.15.1/bin/node
    Yarn: 1.22.19 - ~/.nvm/versions/node/v16.15.1/bin/yarn
    npm: 8.11.0 - ~/.nvm/versions/node/v16.15.1/bin/npm
  npmPackages:
    jest: ^28.1.2 => 28.1.2

[davidtaing]

I don't quite understand what's going on, but I was able to replicate this on my machine.

System:
    OS: Windows 10 10.0.19043 Build 19043
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
  Binaries:
    Node: 16.15.0 - ~/.nvm/versions/node/v16.15.0/bin/node
    npm: 8.5.05- ~/.nvm/versions/node/v8.5.5/bin/npm
  npmPackages:
    jest: ^28.1.2 => 28.1.2

[mifi]

I'm getting the same error:

Module cache already has entry .../got/dist/source/index.js. This is a bug in Jest, please report it!

I think it's related to dynamic imports:

const gotPromise = import('got')

Update: The error went away by moving the dynamic import away from the root of the file, and into the code that uses the import:

(await import('got')).got.get(...)

however now the whole test suite hangs forever

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[SimenB]

@bameyrick sorry, missed this one! I get an error when trying to run npm run fetch

$ npm run fetch

> [email protected] fetch
> ts-node src/fetch.ts

(node:11581) 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)
/Users/simen/repos/iso-3166-1-flags-sprite-generator/src/fetch.ts:1
import fetch from 'node-fetch';
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at Object.compileFunction (node:vm:360:18)
    at wrapSafe (node:internal/modules/cjs/loader:1055:15)
    at Module._compile (node:internal/modules/cjs/loader:1090:27)
    at Module.m._compile (/Users/simen/repos/iso-3166-1-flags-sprite-generator/node_modules/ts-node/src/index.ts:1597:23)
    at Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
    at Object.require.extensions.<computed> [as .ts] (/Users/simen/repos/iso-3166-1-flags-sprite-generator/node_modules/ts-node/src/index.ts:1600:12)
    at Module.load (node:internal/modules/cjs/loader:1004:32)
    at Function.Module._load (node:internal/modules/cjs/loader:839:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at phase4 (/Users/simen/repos/iso-3166-1-flags-sprite-generator/node_modules/ts-node/src/bin.ts:579:12)

[SimenB]

Never mind, seems like the step is not needed - I can reproduce 👍

[SimenB]

https://github.com/facebook/jest/releases/tag/v29.0.2

[github-actions[bot]]

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