Deno.readTextFileSync | Deno.readTextFile - is not a function

After hours of looking around, I came across this:
https://deno.land/x/google_jwt_sa@v0.2.3

.. in hopes of solving the following issue:
help-and-questionsError: not implemented: crypto.Sign

However, neither "readTextFile" nor "readTextFileSync" is recognized. WHY?
What version does supabase run? What is the workaround for this?
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