Error: The 'jiti' library is required for loading TypeScript configuration files

[jerone]

When running eslint-nibble directly from npx, it's throwing "Error: The 'jiti' library is required for loading TypeScript configuration files." error.

I'm using an eslint.config.ts file for the configuration.

Console output:

npx eslint-nibble@latest .
Need to install the following packages:
eslint-nibble@9.0.0
Ok to proceed? (y)

C:\Users\<user>\AppData\Local\npm-cache\_npx\a6c2bc28fc985a45\node_modules\eslint\lib\config\config-loader.js:145
                        throw new Error(
                              ^

Error: The 'jiti' library is required for loading TypeScript configuration files. Make sure to install it.
    at C:\Users\<user>\AppData\Local\npm-cache\_npx\a6c2bc28fc985a45\node_modules\eslint\lib\config\config-loader.js:145:10
    at async loadTypeScriptConfigFileWithJiti (C:\Users\<user>\AppData\Local\npm-cache\_npx\a6c2bc28fc985a45\node_modules\eslint\lib\config\config-loader.js:144:3)
    at async loadConfigFile (C:\Users\<user>\AppData\Local\npm-cache\_npx\a6c2bc28fc985a45\node_modules\eslint\lib\config\config-loader.js:266:11)
    at async ConfigLoader.calculateConfigArray (C:\Users\<user>\AppData\Local\npm-cache\_npx\a6c2bc28fc985a45\node_modules\eslint\lib\config\config-loader.js:589:23)
    at async #calculateConfigArray (C:\Users\<user>\AppData\Local\npm-cache\_npx\a6c2bc28fc985a45\node_modules\eslint\lib\config\config-loader.js:770:23)
    at async entryFilter (C:\Users\<user>\AppData\Local\npm-cache\_npx\a6c2bc28fc985a45\node_modules\eslint\lib\eslint\eslint-helpers.js:289:5)
    at async NodeHfs.<anonymous> (file:///C:/Users/<user>/AppData/Local/npm-cache/_npx/a6c2bc28fc985a45/node_modules/@humanfs/core/src/hfs.js:574:24)
    at async NodeHfs.walk (file:///C:/Users/<user>/AppData/Local/npm-cache/_npx/a6c2bc28fc985a45/node_modules/@humanfs/core/src/hfs.js:614:3)
    at async globSearch (C:\Users\<user>\AppData\Local\npm-cache\_npx\a6c2bc28fc985a45\node_modules\eslint\lib\eslint\eslint-helpers.js:331:20)
    at async Promise.allSettled (index 0)

---

Windows 11
Node.js v22.16.0
NPM 11.4.1

[IanVS]

This error is coming from eslint itself, which does require jiti to be installed in order to use .ts config files. Though there's also a flag that can be set when using newer node versions to use node's type-stripping instead: eslint/eslint#19357.

Have you tried installing jiti?

[jerone]

Have you tried installing jiti?

No, I didn't because I was running it via npx and I didn't want to install this dependency globally:

npx eslint-nibble <directories and files to lint>

[IanVS]

Are you able to run eslint directly, but not while using eslint-nibble? What do you get from npx eslint <directories and files to lint>?

[jerone]

Are you able to run eslint directly, but not while using eslint-nibble? What do you get from npx eslint <directories and files to lint>?

Yes. Linting works as expected. Also with npx.

---

Node.js v22.16.0
ESLint v9.28.0

[IanVS]

Interesting. Can you please run npm ls jiti? I'm curious if it got installed on your system but it's just not being found when running eslint-nibble.

[jerone]

npm ls jiti
+-- eslint@9.28.0
| `-- jiti@2.4.2
`-- knip@5.61.0
  `-- jiti@2.4.2 deduped