feat(eslint): add compat eslint plugin #364
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This adds https://www.npmjs.com/package/eslint-plugin-compat. This plugin checks the js APIs you're using against your browserslist. It'll warn you when you're using js APIs that aren't supported by your target audience.
As long as we're sticking to stable browser features, and not polyfilling with babel to features that haven't shipped with browsers yet, this is a useful plugin to have (and even if we do it can be useful, just means that we need to define the polyfills we ship).