bug#59906: 29.0.60; typescript-ts-mode is not highlighting escape sequences

[Jostein Kjønigsen]

In a buffer with typescript-ts-mode activated, write the following code:

const test = "quoted\"string\" contents";

The entire text, include the \" is highlighted as strings, and escape sequences are not handled:

This code has the following tree-sitter syntax tree:

> (lexical_declaration kind: const
>          (variable_declarator name: (identifier) value: =
>           (string " (string_fragment) (escape_sequence)
>         (string_fragment) (escape_sequence) (string_fragment) "))
>          ;)
      In typescript-ts-mode we seemingly have rules to handle
      fontification of escape sequences:

>    :language language
>            :feature 'escape-sequence
>            :override t
>            '((escape_sequence) @font-lock-escape-face))
>       
      This feature is however not activated in the major-mode setup:

>     (setq-local
>         treesit-font-lock-feature-list
>                         '((comment declaration)
>                           (keyword string)
>                           (constant _expression_ identifier number pattern
>         property)
>                           (bracket delimiter)))
>

Naively I assumed that simply adding this feature would activate this rule, but still \" is fontified as string.

Invalid escape sequences are not highlighted as warnings either (like they are in json-ts-mode).

Would anyone like to take a stab at this? :)

--
Jostein

In GNU Emacs 29.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.33, cairo version 1.16.0) of 2022-12-08 built on dev-jostein
Repository revision: 8fb2afe051168b2eac2bba0ee102039d0af90a05
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12201001
System Description: Ubuntu 22.04.1 LTS

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

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
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
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Major mode: TypeScript

Minor modes in effect:
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  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: yas--auto-fill
  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

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Memory information:
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 (symbols 48 59262 47)
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--
Jostein Kjønigsen
jostein.kjønigsen.no
jostein@kjonigsen.net - jostein@gmail.com