Jostein Kjønigsen <jostein@secure.kjonigsen.net> writes:

> 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.

Yeah, there was an error there.  See below patch.

Yuan, can you install this?

Theo