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lang-js
MyEnumAware(), where theEnumAwareComponentinstance is passed, and has a property,MyEnum, added to its prototype. The value of the property is set the enum itself. This method does the same thing as the accepted answer. It's just taking advantage of the syntactic sugar proposed for decorators and allowed in TypeScript. When using Angular you're using decorator syntax right off the bat. That's what aComponentis, an extension of an empty class that Angular's core classes know how to interact with.ERROR in ng:///.../whatever.component.html (13,3): Property 'MyEnum' does not exist on type 'EnumAwareComponent'. This makes sense, because the property the decorator adds is never declared, leaving the typescript compiler unaware of its existence.--prodbuild (Ionic 3 / Angular 4 / Typescript 2.4.2) it no longer works. I get the error"TypeError: Cannot read property 'FirstValue' of undefined". I'm using a standard numeric enum. It works fine with AoT but not with--prod. It does work if I change it to using integers in the HTML, but that's not the point. Any ideas?