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I am using js-mode in emacs 25.1. There are some indentation rules that are not editable through the provided customization variables. The specific one I have issue with is the indentation of arrow functions, they are not indented like regular anonymous functions. After looking at the function js--proper-indentation, the only way to edit it is to redefine the function. Should I redefine it in my js-mode-hook?

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You will probably want to use defadvice to provide a wrapper around js--proper-indentation, rather than cometely redefining it. This will allow you to handle the indentation for arrow functions yourself, while calling through to the original function to handle everything else.

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    Better use advice-add instead of defadvice. This allows to used functions defined like normal functions (defun) for advices, change them while applied as advices and to remove them. – theldoria Aug 27 '16 at 20:34
  • I used advice-add. Though I did end up using the :override for the WHERE argument and rewrote the js--proper-indentation function. Originally I tried use :before-until, but there where so many conditions to handle before I could event try to check for the arrow functions, it was easiest to use the real function as a template and make my adjustments. – lookyhooky Aug 28 '16 at 3:39

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