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lang-js
setPrototypeOf()? At least according to MDN, it's generally discouraged to use it if you can accomplish the same thing by just setting the.prototypeproperty on the constructor (as you're doing in theelseblock for browses that don't havesetPrototypeOf).setPrototypeOf. But if you still need it (as OP asks), you should use the built-in methodology. As MDN indicates, this is considered the proper way to set the prototype of an object. In other words, MDN says do not change the prototype (as it affects performance and optimization) but if you have to, usesetPrototypeOf.CustomError.prototype = Object.create(Error.prototype)). Also,Object.setPrototypeOf(CustomError, Error.prototype)is setting the prototype of the constructor itself rather than specifying the prototype for new instances ofCustomError. Anyway, in 2016 I think there's actually a better way to extend errors, although I'm still figuring out how to use it together with Babel: github.com/loganfsmyth/babel-plugin-transform-builtin-extend/…CustomError.prototype = Object.create(Error.prototype)is also changing the prototype. You have to change it since there is no built-in extend/inherit logic in ES5. I'm sure the babel plugin you mention does similar things.Object.setPrototypeOfdoesn't make sense here, at least not in the way you're using it: gist.github.com/mbrowne/4af54767dcb3d529648f5a8aa11d6348. Perhaps you meant to writeObject.setPrototypeOf(CustomError.prototype, Error.prototype)- that would make slightly more sense (although still providing no benefit over simply settingCustomError.prototype).