AppleScript debug with shellcheck

Question

I am a complete novice using Script Editor. I don't even know what language this is written in, but I'm trying to use shellcheck.net to debug this:

var=value LDMIcon to path to resource "LDM_Icon.icns" in bundle (path to me)
set CurrentOS to do shell script "sw_vers -productVersion | cut -c 1-4"

shellcheck says this;

var=value LDMIcon to path to resource "LDM_Icon.icns" in bundle (path to me)
>>                                                              ^-- SC1036 (error): '(' is invalid here. Did you forget to escape it?
>>                                                              ^-- SC1088 (error): Parsing stopped here. Invalid use of parentheses?

I've tried to fix it using the github tips (SC1036 etc) with no luck. Can anyone help?

Thanks