Typescript `enum` from JSON string

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If you are using Typescript before the 2.4 release, there is a way to achieve that with enums by casting the values of your enum to any.

An example of your first implementation

enum Type {
    NEW = <any>"NEW",
    OLD = <any>"OLD",
}

interface Thing { type: Type }

let thing:Thing = JSON.parse('{"type": "NEW"}');

alert(thing.type == Type.NEW); // true

Typescript 2.4 has built in support for string enums already, so the cast to any would be no longer necessary and you could achieve it without the use of String Literal Union Type, which is ok for validation and autocomplete, but not so good for readability and refactoring, depending on the usage scenario.

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