bug#67129: 30.0.50; starting js-mode or js-ts-mode eats ram until emacs gets killed

[Eli Zaretskii]

> Date: Sun, 12 Nov 2023 12:24:39 +0000
> From:  alex via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Running from the current master build of emacs when entering js-mode
> emacs consumes ram until it is eventually killed by the OS including
> when executed with -Q

If you mean this recipe:

  emacs -Q
  M-x js-mode RET

then after it I cannot see any changes in the Emacs's memory
footprint.  It stays constant.  Do I need to do something else, like
visit a JS source file?