Begrudgingly add eslint back #77
Merged
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@alice PTAL.
I really dislike ESLint because it mixes style guide enforcement with error checking and is super wonky to configure.
Having said that, as soon as I published v3.0 someone pointed out that I had snuck an untranspiled
constin there.This PR adds ESLint back but scopes it to only lint the
src/focus-ring.jsfile, and to only check that we're not using ES2015 features. It does not try to do style guide enforcement via ESLint (instead it defers to Prettier). Finally, the PR adds a precommit hook to run ESLint against any file changes tosrc/focus-ring.jsand bail if it fails.