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I'm a newcomer to Emacs from Vim, I use rsjx-mode for react files. Its major mode calls itself RJSX, but I would like to call it React, so how can I overwrite the rjsx package major mode name?

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    Why and where do you want to "overwrite the...major mode name"? And what do you mean by "overwrite" here? Is this about the value of variable major-mode, variable mode-name, or something else? (Use C-h v to see what those variables are about.)
    – Drew
    Feb 1, 2020 at 15:56
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    Is it the way the mode is named in the mode line that you want to change? If so, please consider rewording the post title.
    – JeanPierre
    Feb 1, 2020 at 20:17

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Reset to default
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If you don't want to use the delight package, you can also just do it by hand:

(add-hook 'rsjx-mode-hook
          (lambda ()
            (setq mode-name "React")))
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  • Agreed, but noting that delight additionally arranges for the original (real) name to still be shown when you do things like C-h m (describe-mode), with the custom name only used in the mode-line. Conversely a simple (setq mode-name "React") would cause describe-mode to say something like "React mode defined in rsjx.el", which (IMHO) is potentially confusing. YMMV.
    – phils
    Feb 1, 2020 at 23:40
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If you install the delight package:

M-x package-install RET delight RET

You can then add this configuration to your init file:

(delight 'rsjx-mode "React" :major)

in order to change the name displayed in the mode line.

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  • n.b. The change will affect new buffers; any pre-existing buffers in this major mode would need to be reverted for them to show the change.
    – phils
    Feb 1, 2020 at 23:46

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