(comment) @comment @spell

(key) @property

(value) @string

(value (escape) @string.escape)

((value) @boolean
 (#any-of? @boolean "true" "false"))

((value) @number
 (#lua-match? @number "^%d+$"))

(index) @number

(property [ "=" ":" ] @operator)

[ "${" "}" ] @punctuation.special

(substitution ":" @punctuation.special)

[ "[" "]" ] @punctuation.bracket

[ "." "\\" ] @punctuation.delimiter

((substitution (key) @constant)
 (#lua-match? @constant "^[A-Z_][A-Z0-9_]*$"))