ESLint added experimental support for typescript config files since
[9.9.0](https://eslint.org/blog/2024/08/eslint-v9.9.0-released/#experimental-typescript-configuration-files),
and as of
[9.18.0](https://eslint.org/blog/2025/01/eslint-v9.18.0-released/#stable-typescript-configuration-file-support)
that support is stable. This PR add ts/mts/cts to the list of known
eslint config files, and adds the same extensions to config file
generators
## Current Behavior
When using the eslint executor with a ts file, returns error "When using
the new Flat Config with ESLint, all configs must be named
eslint.config.js or eslint.config.cjs and .eslintrc files may not be
used. See
https://eslint.org/docs/latest/use/configure/configuration-files"
When using the eslint plugin, the inferred task is not created for
projects that do not have a non-ts eslint config.
### Workarounds
- Compiling ts rules/configs in a project. Introduces other issues
- Using jiti or comparable
- For plugin users, having a fake eslint.config.js at the root allows
the inferred task to be created. ESLint will still use the ts config.
- Cache targets are wrong
- Complications in non-monorepo workspaces
## Expected Behavior
When using the eslint executor with a ts file, no error is thrown.
When using the eslint plugin with a ts file, the inferred task is
created.
## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->
No issues, but addresses [this
discussion](https://github.com/nrwl/nx/discussions/29710#discussion-7856165)
---------
Co-authored-by: Leosvel Pérez Espinosa <leosvel.perez.espinosa@gmail.com>
f1c090b640