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lang-js
extends,class, andsuperwere all added in ES2015, several years after OP's initial query. Not knocking your approach; just tossing in a word of defense for some of the the other answers is all. Speaking as someone who's been a full-time FED since '96, let me assure you: there's a LOT of stuff that's WAY less complicated now, lol.this.constructor.namecannot be used with bundlers that mangle class or function names, because the error class name in the minified code might be shortened.