Install
Easiest way to install eslint is to use mach:
mach eslint --setup
You can manually install eslint using npm as well. For example, on OS X:
brew install npm npm -g install eslint
Run
eslint should be run from mobile/android as it contains the base .eslintignore and .eslintrc files. If you run from another directory, eslint may not parse these files and the output may be unexpected. For example, from the repository root:
mach eslint mobile/android