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uladkasach/isOfEnum.ts

Created March 28, 2021 14:41
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isOfEnum.ts
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isOfEnum.ts
// generic fn to create those type guards: https://stackoverflow.com/a/58278753/3068233
const createIsOfEnum = <T>(e: T) => (token: any): token is T[keyof T] => Object.values(e).includes(token as T[keyof T]);
// then use it to create a type checker for your particular enums
const isPlanet = createIsOfEnum(Planet);
// ...
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