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This is a 馃敠 documentation change.
Summary
I've modified the documentation to mention the requirement of a JavaScript runtime, an issue that arises when following the existing instructions.
Context
This issue was referenced by another user here: #2327 (comment)
The language I've used in the update reflects the language used in the error output (see first line of stacktrace in comment, copied below]. That language references execjs for a list of JavaScript runtimes: