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Since js2-mode does not have eldoc-mode support, I was wondering if I could get some similar functionality to js2-mode with the help of tern-mode.

tern-mode has a command tern-get-type which will return the type of the thing under cursor in the minibuffer. How can I get this command to run automatically when cursor is idle (preferably after a small delay)?

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  • Not the same thing but close, have you looked at Helm Dash github.com/areina/helm-dash ?
    – Darryl Hebbes
    Sep 7, 2016 at 12:04
  • I already have the dash app for mac for browsing documentation. Yes, I did try out helm-dash, but eventually decided it's better to stick with dash app for mac instead.
    – Chakravarthy Raghunandan
    Sep 7, 2016 at 12:28

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The right thing to do is to run this tern-get-type from eldoc-documentation-function. This way, eldoc-mode will take care of running it after a little delay etc...

I.e. maybe something like

(defun js2--eldoc-via-tern ()
  ...(tern-get-type..)...)

(add-hook 'js2-mode-hook
          (lambda ()
            (setq-local eldoc-documentation-function #'js2--eldoc-via-tern)))

You might even do that to js-mode rather than js2-mode (since nowadays js2-mode inherits from js-mode).

If/when it works, I suggest you submit it for inclusion in js(2)-mode, e.g. via M-x report-emacs-bug.

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  • I'll try this out today.And is it okay to report this? Since not everyone who uses js2-mode will use tern-mode and this would cause a dependancy on tern-mode
    – Chakravarthy Raghunandan
    Sep 7, 2016 at 13:32
  • I don't guarantee that it will be accepted and integrated, but it's definitely worth submitting. The various different major modes should aim to merge rather than to diverge and re-invent the wheel.
    – Stefan
    Sep 7, 2016 at 13:35
  • I got this to work and reported this feature as a bug. Thanks for the help.
    – Chakravarthy Raghunandan
    Sep 7, 2016 at 13:59
  • @ChakravarthyRaghunandan Please post the working solution!
    – Phil Hudson
    Nov 4, 2018 at 10:51
  • @PhilHudson I use tern-mode with js2-mode now. So, it doesn't have the problem I mentioned in this old post.
    – Chakravarthy Raghunandan
    Nov 4, 2018 at 16:55

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