Vue support

[saadq]

Would be nice to have a --vue flag. This shouldn't be problematic on the ESLint side of things due to eslint-plugin-vue. Unfortunately, I'm not sure if this can be handled on the TSLint side of things though due to single-file components. More info about that here: palantir/tslint#2099

Due to my limited (basically zero) knowledge of Vue, I could definitely use help in this department.

[g-plane]

I think we can support it with ESLint first. This will make the linter available for those who uses pure JavaScript and Vue.js.

[saadq]

Yep, I think I'll go with that and just add a disclaimer in the README about issues with using --vue and --typescript together (or might just throw an error if both those flags are passed together).

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Note to self:

• https://github.com/mysticatea/vue-eslint-parser
• https://github.com/vuejs/eslint-plugin-vue