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Showing content from https://lists.gnu.org/archive/html/emacs-devel/2022-11/msg01340.html below:

Re: Tree-sitter and major mode inheritance

Date: Sun, 20 Nov 2022 01:42:04 +0200
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org,
  monnier@iro.umontreal.ca, theo@thornhill.no
From: Dmitry Gutov <dgutov@yandex.ru>

On 20.11.2022 01:36, Yuan Fu wrote:
If we keep js-mode as-is, and add js-base-mode and js-ts-mode, (derived-mode-p 
‘js-mode) should keep working as before, or maybe I’m msiunderstanding your 
question?
(derived-mode-p 'js-mode) will return nil in js-ts-mode.

Which could be a problem when this call is used as a substitute for a
file type check (e.g. "are we editing a JavaScript file?"), which is one
of its common uses.

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