How to build a type from enum values in TypeScript?

Question

Given the following:

enum FooKeys {
  FOO = \'foo\',
  BAR = \'bar\',
}

I\'d like to make an interface like this one, but instead of defini

Answer 1

@hackape 's solution is great, but I found minimal duplication extending his solution as below:

type ReverseMap> = {
  [V in T[keyof T]]: {
    [K in keyof T]: T[K] extends V ? K : never;
  }[keyof T];
}

const Map = {
  'FOO': "foo" as "foo",
  'BAR': "bar" as "bar",
}

const reverseMap: ReverseMap = Object.entries(Map).reduce((rMap, [k, v]) => {
  rMap[v] = k;
  return rMap;
}, {} as any);

export type Values = keyof typeof reverseMap; // 'foo' | 'bar';

ReverseMap implementation is well explained here