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Editorial Team
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Asked: 2026-05-26T15:11:29+00:00

I’m using rails31 & coffeescript and have defined some classes that extend from a

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I’m using rails31 & coffeescript and have defined some classes that extend from a parent class. Coffeescript adds an __extends helper method in the generated output to make this happen, problem is when using sprockets a copy of the method is added for every subclass, creating a lot of duplication.

My classes are defined in separate files, so it looks like sprockets is getting coffee to process them individually. I know there is a —join option with coffee but not sure how to use that with sprockets.

Does anyone know if it’s possible to generate coffee helpers only once when using sprockets?

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  1. Editorial Team

    Nope. Whether you’re using Sprockets or not, helpers are a one-per-file kind of deal. There’s no compiler option for avoiding this duplication (--join won’t do it; it just concatenates the compiled JS), and no existing JS minifier is smart enough to identify and remove the duplicates (which would require moving one instance to a global scope).

    My advice would be to not worry about it. CoffeeScript uses few helpers, and they’re unlikely to account for more than a tiny fraction of your code.

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