I'm using the Xcode 12 Beta and have Safari Technology Preview 14 installed. I'm on Catalina, not Big Sur (can't upgrade yet as have many tools that will probably break). When I run the xcrun command:
I get this msg:
safari-web-extension-converter requires at least Safari 14.0 to run.
Unable to parse manifest.json at file:///path/to/extension/code
Will this run under Catalina or is Big Sur the min. OS version required to use this tool?
LedTee
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Safari Technology Preview 14 was made available yesterday. I have it and am using it, but still can't get the extension conversion script to work.
Had the same issue running Big Sur (beta 3) on a brand new 2020 MacBook Air (i5/16GB/512GB). Zapped the PRAM on boot (Command-Option-P-R), and the message went away.