Well, that's basically how you would have done it in vanilla JS before typescript came around. The main awkwardness is the type definition. I often prefer to use a library like type-fest for this kind of thing so you can just say:

    export type MyEnum = ValueOf<MyEnumMapping>;

TypeScript not having enough sugar in its built-in utility types is definitely a fair criticism.

But more to the point, the above is not usually how you do enums in TS unless you have some very specific reason to want your values to be numbers at all times. There are some cases like that, but usually you would just let the values be strings, and map them to numbers on demand if that's actually required (e.g. for a specific serialization format).