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Re:Opal: Ruby to JavaScript Compiler by adambeynon on Thursday June 05, 2014 @10:19AM (#7852074)
(Opal developer here).

When it comes to debugging, I just use the standard chrome dev tools with source maps. Variables and properties on objects all compile using their ruby names, so viewing local vars and ivars in the debugger is easy. I only ever debug the generated javascript when I am debugging a bug with Opals runtime/internals/compiled code.

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