Awesome
Language Meson
Syntax highlighting for the Meson language.
Note for other editors
Editors such as Sublime Text, TextMate, and Visual Studio Code can use the same syntax highlighting but the grammar file must be converted to the TextMate format.
Note that you would first have to convert the grammar file in either JSON format, PLIST format, or YAML format.
The easiest method to do so is via the Sublime Text PackageDev package. Somebody could decouple the conversion library it uses to ease future conversion also. Example output is here.