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As of April 2016, Flycheck has no built in support for JSLint (but does include support for jshint, eslint, and gjslint). Fortunately support is straight forward to add.
1. Install Node.js and NPM.
2. Install JSLinter:
npm install jslinter -g
3. Add to
:command according to your system):
4. Restart Emacs to make sure everything loads fine.