>>
>> I'm not sure what you meant by the last sentence, sorry. What 
>> do you
>> think about the below?
>>
>>   (sigil (sigil_name) @elixir-ts-font-sigil-name-face)
>>   @font-lock-string-face)
>
> Sorry for the late reply.  I believe the following patch is more
> appropriate as it will apply the sigil font to the entire sigil, 
> but
> also respect the regex face.  We can add string specific matches
> later,
> but happy just to simplify what we have and fix apply 
> appropriate font
> to previously unmatched sigils.
>
> [2. text/x-patch; 
> 0001-Simplify-sigil-font-lock-match-for-elixir-ts-mode.patch]...

Actually, the above patch breaks the embedded HEEx sigils' font. 
We
have to exclude it when doing a general match.  Attached works 
with ~H
sigils as well.  Please ignore the previous patch and install this 
one.