fix(schematics): add support for eslint.cjs files

[JeromeWirth]

Closes #3583

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• [] Tests for the changes have been added (for bug fixes / features)
• [] Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #3583

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[X] No

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[timdeschryver]

Could you add a test case for this please?
This change detects js config files, but I assume that the implementation (https://github.com/ngrx/platform/blob/main/modules/eslint-plugin/schematics/ng-add/index.ts#L22) needs to be updated as well.

[NathanLaing]

If this stays stale I'm happy to pick it up and write some tests.

Out of interest are other .eslint.? supported?
The default is .json so it makes sense we handle that.
The piece I am missing is is there somewhere we handle the others (i.e. .js, .ts, .mjs) or are they not yet supported?

[JeromeWirth]

Sorry for the late reply. This is the point where im currently stuck. For now only .json is allowed and i'm not sure how to transform it into a valid .cjs file.

Sine im bit busy currently feel free to pick it up.

[timdeschryver]

We're currently only support the .json format (and we have tests for this).
Because this PR is/will become stale I'm closing this.
Feel free to create a new PR with the needed changes to support other formats, e.g. .js.