bug#60503: 29.0.60; js-ts-mode has inconsistent features/fontification wrt other ts major-modes

["Jostein Kjønigsen" <jostein@secure.kjonigsen.net>]

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js-ts-mode does not adhere to the "standardized" features and 
fontification levels requested in emacs-devel.

It's overall pretty good, but I did find one minor inconsistency which 
annoyed me enough to (IMO) warrant an update:

js-ts-mode does not highlight incoming parameters in 
functions/methods/arrow-expressions as variables.

Attached is a patch which fixes this issue and makes it much more 
consistent with csharp-ts-mode, tsx-ts-mode and typescript-ts-mode.

--


In GNU Emacs 29.0.60 (build 7, x86_64-pc-linux-gnu, GTK+ Version
  3.24.34, cairo version 1.16.0) of 2023-01-01 built on ThinkPad-T14s
Repository revision: f12f72b0e09c7a45098955c1304499963a5eb9a7
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12201003
System Description: Ubuntu 22.10

Configured using:
  'configure --with-json --with-tree-sitter'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
   value of $LC_MONETARY: nb_NO.UTF-8
   value of $LC_NUMERIC: nb_NO.UTF-8
   value of $LC_TIME: nb_NO.UTF-8
   value of $LANG: en_US.UTF-8
   locale-coding-system: utf-8-unix

Major mode: Magit

Minor modes in effect:
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   undo-tree-mode: t
   global-git-commit-mode: t
   magit-auto-revert-mode: t
   editorconfig-mode: t
   which-function-mode: t
   helm-mode: t
   helm-minibuffer-history-mode: t
   shell-dirtrack-mode: t
   helm--remap-mouse-mode: t
   async-bytecomp-package-mode: t
   delete-selection-mode: t
   global-auto-revert-mode: t
   yas-global-mode: t
   yas-minor-mode: t
   global-nlinum-mode: t
   ido-yes-or-no-mode: t
   override-global-mode: t
   server-mode: t
   global-hl-line-mode: t
   pixel-scroll-precision-mode: t
   doom-modeline-mode: t
   tooltip-mode: t
   global-eldoc-mode: t
   show-paren-mode: t
   electric-indent-mode: t
   mouse-wheel-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   buffer-read-only: t
   column-number-mode: t
   line-number-mode: t
   transient-mark-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t

Load-path shadows:
/home/jostein/.emacs.d/elpa/transient-20221202.1727/transient hides 
/home/jostein/build/emacs/lisp/transient

Features:
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magit-blame magit-stash magit-reflog magit-bisect magit-push magit-pull
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magit-mode transient magit-git magit-base magit-section crm compat-27
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csharp-mode c-ts-mode treesit cc-langs cc-mode cc-fonts cc-guess
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cal-menu calendar cal-loaddefs org-version org-compat org-macs helm-mode
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time-date ls-lisp helm-buffers helm-occur helm-tags helm-locate
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data-alltheicons shrink-path rx f f-shortdoc shortdoc
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highlight-symbol-autoloads multiple-cursors-autoloads
projectile-autoloads nlinum-autoloads pkg-info-autoloads epl-autoloads
undo-tree-autoloads rust-mode-autoloads editorconfig-autoloads
magit-autoloads yasnippet-autoloads elisp-slime-nav-autoloads
crontab-mode-autoloads ido-yes-or-no-autoloads magit-section-autoloads
cargo-autoloads ido-completing-read+-autoloads memoize-autoloads
paredit-autoloads company-autoloads yaml-mode-autoloads
powershell-autoloads dap-mode-autoloads lsp-docker-autoloads
yaml-autoloads lsp-treemacs-autoloads treemacs-autoloads cfrs-autoloads
posframe-autoloads hydra-autoloads pfuture-autoloads
ace-window-autoloads avy-autoloads bui-autoloads lsp-mode-autoloads
lv-autoloads markdown-mode-autoloads spinner-autoloads ht-autoloads
git-commit-autoloads transient-autoloads compat-autoloads
cmake-mode-autoloads shrink-path-autoloads f-autoloads info
dash-autoloads s-autoloads popup-autoloads queue-autoloads package
browse-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie generate-lisp-file url-domsuf url-util mailcap url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs password-cache
json subr-x map byte-opt gv bytecomp byte-compile url-vars cl-loaddefs
cl-lib rmc iso-transl tooltip cconv eldoc paren electric uniquify
ediff-hook vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode lisp-mode prog-mode register
page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors
frame minibuffer nadvice seq simple cl-generic indonesian philippine
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable backquote
threads dbusbind inotify lcms2 dynamic-setting system-font-setting
font-render-setting cairo move-toolbar gtk x-toolkit xinput2 x multi-tty
make-network-process emacs)

Memory information:
((conses 16 1404910 128978)
  (symbols 48 47016 24)
  (strings 32 203095 12541)
  (string-bytes 1 6450958)
  (vectors 16 95226)
  (vector-slots 8 1840465 212702)
  (floats 8 890 1003)
  (intervals 56 86732 4097)
  (buffers 984 44))

-- 
Vennlig hilsen
*Jostein Kjønigsen*

jostein@kjonigsen.net 🍵 jostein@gmail.com
https://jostein.kjønigsen.no <https://jostein.kjønigsen.no>

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From 4f3996bbe15dae049a0560a1e7ffe3560a7e0eae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jostein=20Kj=C3=B8nigsen?= <jostein@kjonigsen.net>
Date: Mon, 2 Jan 2023 21:26:36 +0100
Subject: [PATCH 3/3] lisp/progmodes/js.el: Improve fontification consistency

- Highlight declared parameters in functions, methods and
  arrow-expressions as variables.
---
 lisp/progmodes/js.el | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lisp/progmodes/js.el b/lisp/progmodes/js.el
index c5fdecae71b..050472002bb 100644
--- a/lisp/progmodes/js.el
+++ b/lisp/progmodes/js.el
@@ -3521,6 +3521,15 @@ js--treesit-font-lock-settings
      (method_definition
       name: (property_identifier) @font-lock-function-name-face)
 
+     (method_definition
+      parameters: (formal_parameters (identifier) @font-lock-variable-name-face))
+
+     (arrow_function
+      parameters: (formal_parameters (identifier) @font-lock-variable-name-face))
+
+     (function_declaration
+      parameters: (formal_parameters (identifier) @font-lock-variable-name-face))
+
      (variable_declarator
       name: (identifier) @font-lock-variable-name-face)
 
-- 
2.37.2