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(require 'flycheck)
(add-hook 'js2-mode-hook
          (lambda () (flycheck-mode t)))

Used this, to setup flycheck for javascript development. However, i noticed config changes in .jshintrc is not considered at all for error highlighting (setting asi as true to suppress missing semicolons is one such case.) Later, i saw that js2-mode has inbuilt support for error highlighting. So, what set of rules js2-mode and is it as customizable as flycheck-jshint?

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js2-mode does not use jshint, it will do the syntax check in elisp.

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The default checker for js2-mode is jshint.

You don't have to use a lambda function to enable flycheck-mode.

(add-hook 'js2-mode-hook 'flycheck-mode)
(setq flycheck-jshintrc "~/.emacs.d/.jshintrc")

or add your own path to the .jshintrc file.

Later edit: To verify your flycheck setup for a specific buffer, C-c ! v or M-x flycheck-verify-setup.

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