nix-community.nixvim/plugins/languages/treesitter/injections.scm

;; extends

(binding
  attrpath: (attrpath
    (identifier) @_path)
  expression: [
    (string_expression
      ((string_fragment) @injection.content
        (#set! injection.language "lua")))
    (indented_string_expression
      ((string_fragment) @injection.content
        (#set! injection.language "lua")))
  ]
  (#match? @_path "(^(extraConfigLua(Pre|Post)?|__raw))$"))

(apply_expression
  function: (_) @_func
  argument: [
    (string_expression
      ((string_fragment) @injection.content
        (#set! injection.language "lua")))
    (indented_string_expression
      ((string_fragment) @injection.content
        (#set! injection.language "lua")))
  ]
  (#match? @_func "(^|\\.)mkRaw$")
  (#set! injection.combined))

(binding
  attrpath: (attrpath
    (identifier) @_path)
  expression: [
    (string_expression
      ((string_fragment) @injection.content
        (#set! injection.language "vim")))
    (indented_string_expression
      ((string_fragment) @injection.content
        (#set! injection.language "vim")))
  ]
  (#match? @_path "(^extraConfigVim(Pre|Post)?)$"))