GNU bug report logs - #71992
30.0.60; major-mode-remap-alist doesn't work for combination js-mode + js-ts-mode

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From: Roman Rudakov <rrudakov <at> fastmail.com>
To: Dmitry Gutov <dmitry <at> gutov.dev>
Cc: Jeremy Bryant <jb <at> jeremybryant.net>, Stefan Monnier <monnier <at> IRO.UMontreal.CA>, 71992 <at> debbugs.gnu.org
Subject: bug#71992: 30.0.60; major-mode-remap-alist doesn't work for combination js-mode + js-ts-mode
Date: Tue, 09 Jul 2024 10:51:43 +0200

Dmitry Gutov <dmitry <at> gutov.dev> writes:

> On 09/07/2024 00:37, Jeremy Bryant via Bug reports for GNU Emacs, 
> the
> Swiss army knife of text editors wrote:
>> Roman Rudakov<rrudakov <at> fastmail.com>  writes:
>> 
>>> 1. Evaluate: (setopt major-mode-remap-alist '((js-mode 
>>> . js-ts-mode)))
>>> 2. C-x C-f ~/tmp.js
>>>
>>> Expected result:
>>>
>>> major-mode is js-ts-mode
>>>
>>> Actual result:
>>>
>>> major-mode is js-mode
>>>
>>>
>>> In GNU Emacs 30.0.60 (build 1, aarch64-apple-darwin23.5.0, NS
>>> appkit-2487.60 Version 14.5 (Build 23F79)) of 2024-07-06 built on
>>> Romans-MBP.home
>>> Windowing system distributor 'Apple', version 10.3.2487
>>> System Description:  macOS 14.5
>>>
>> FWIW, I've been able to reproduce this bug report in 30.0.60 and 
>> 29.4
>
> The reason might be that its auto-mode-alist entry references
> javascript-mode (and js-mode is made an alias in autoloads).

Indeed, adding (javascript-mode . js-ts-mode) entry to 
major-mode-remap-alist solves the problem.
-- 
Best regards, Roman

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