We use ESLint because it's the best JavaScript linting toolchain available. I've been very happy with its level of configurability, though I think their choice of JSON for the configuration language is a particularly poor one.

The performance is also quite good in the latest versions; it's considerably faster the Python linters we use to lint our backend and most of the other ~10 linters we run in parallel as part of our normal linting experience (see linked blog post for details on that).