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by tlrobinson 4077 days ago
I wrote a similar instrumenting debugger for JavaScript awhile back, but haven't maintained it: https://github.com/tlrobinson/xebug

At one point even I implemented the V8 debugger protocol so you could use the Web Inspector, and an HTTP proxy that would automatically instrument JavaScript files (using synchronous XMLHttpRequests to block execution...), but I don't think I ever posted that code :(