Built-in support for TypeScript

Now that the TypeScript project is officially committed to using and supporting ESLint, I would like to explore adding built-in support for TypeScript in XO. You can already use TypeScript with XO, but I would like to make it just work.

I have already updated the shareable TS config for the new plugin: https://github.com/xojs/eslint-config-xo-typescript/commit/1161b418bebab5511d8dddf4cba98a71bb1311e5

XO will add TypeScript and the TypeScript ESLint plugin as a dependency.

We still need to discuss how it will exactly work. Can we manage to do it without any setting?

Note to self: Should lint foo.d.ts (TS definition files) in non-TS projects automatically.

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• #426 Add TypeScript support

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[pvdlg]

I’ll start working on this issue soon. I need to experiment but I think I can make it work without an option. Every .ts/.tsx would be linted with the xo config + the config from eslint-config-xo-typescript