Re:From Rust to TypeScript
by nidu on Saturday September 12, 2020 @01:22PM
(#24453930)
1. You can define enum like `const enum A {...}` and they will not have runtime representation.
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Correct, but that does not solve the other issues I pointed.
Additionally, const enums DO NOT have an associated type. That is a problem in libraries, since users cannot reuse the type definition around (it back ports to a string or a number)
const enum doesn't work when in transpileOnly mode (e.g. webpack, Parcel), and Babel treats "const enum" the same as "enum". I'd really love a non-broken const enum in TypeScript, though.
I'd love to see them out of the language. I do not have evidence/document supporting this, but I think it was ultimately a failed attempt of copying the C# feature ignoring the fact that JavaScript works differently.