French, like English has a few digraphs, e.g. "ph" /f/ in both French and English, and "ch", /ʃ/ in French, /tʃ/ in English.
In words such as:
is "th" considered a digraph with the pronunciation /t/; or two separate letters, "t" and "h" with the respective pronunciations /t/ and // (silent)? Obviously, both interpretations give the same pronunciation, but I'm wondering which one, if either, is considered "proper".