Add support for eslint-plugin-jsonc plugin

[jpesce]

Name: eslint with eslint-plugin-jsonc plugin
URL: https://ota-meshi.github.io/eslint-plugin-jsonc/

Linter and fixer for JSON, JSONC and JSON5 files that uses eslint. Since eslint is already supported for other filetypes, this should be trivial. I'll make a very basic pull request with the minimum required configuration and let me know if it makes sense supporting it so I can improve it. 🐸

Cheers

[redbmk]

I think I'm running into an issue with this. I recently updated ALE and am now seeing eslint errors in json files, presumably because I don't have this plugin installed. Is there a config to turn off eslint for json, or should there be a new ticket to make it so that it only tries json files if the plugin is installed?

Every line of the json file is underlined and I get the following error:

[eslint] Expected an assignment or function call and instead saw an expression. [Error no-unused-expressions]

Or maybe I need to update my eslintrc to ignore json files (or add the plugin)?

[redbmk]

I also just tried adding *.json to .eslintignore which prevents underlining the whole file, but I get a warning now:

[eslint] File ignored because of a matching ignore pattern. Use "--no-ignore" to override. [Warning]

[hsanson]

Try configuring g:ale_linters so json is not linted by eslint.

[redbmk]

Nice, this worked well:

let g:ale_linters = {'json': []}

Since I tend to use prettier instead of eslint for json, I see this working fine for me, but I feel like that approach might not be the best if e.g. I wanted it to be on for some projects and not for others. For example I use mypy in some python projects and pytype in others. I can have them both configured with ALE and if one isn't installed it just won't (can't) run it and I don't see any errors.

The tricky part here is that eslint is installed, but not the json plugin.

[jpesce]

I wanted it to be on for some projects and not for others

This can be achieved by having project-specific vim configurations. There are many alternatives for this:

• https://github.com/embear/vim-localvimrc
• https://github.com/LucHermitte/local_vimrc
• https://andrew.stwrt.ca/posts/project-specific-vimrc