Is it possible to have nested enum in Typescript?

Question

Having those enums:

export enum First {
  TEST_1 = 'test_1',
  TEST_2 = 'test_2'
}

export enum Second {
  TEST_3 = 'test_3',
  TEST_4 = 'test_4'
}

is it possible to combine them into a single one?

Something like:

export enum Main {
  First {
    TEST_1 = 'test_1',
    TEST_2 = 'test_2'
  },
  Second {
    TEST_3 = 'test_3',
    TEST_4 = 'test_4'
  }
}

Only numeric enums can have computed members, but this expression has type '{ TEST_1: string; TEST_2: string; }'. If you do not need exhaustiveness checks, consider using an object literal instead. listen to ts :)) — Jafar Jabr
– Jafar Jabr, Commented Jan 8, 2022 at 19:50

Ran Turner · Accepted Answer · 2022-01-08 19:56:16Z

2

You can’t create nested enums in TypeScript. What you could do is create a little hack where you can create an object (Main), which contains a bunch of enums and essentially achieve the same effect

enum First {
    TEST_1 = "Main.First.Test1",
    TEST_2 = "Main.First.Test2"
}

enum Second {
    TEST_3 = "Main.Second.Test3",
    TEST_4 = "Main.Second.Test4"
}

const Main = {
    First,
    Second
};

answered Jan 8, 2022 at 19:56

Ran Turner

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