Typescript type defined by array

Question

I'm playing the hole day with keyof, typeof,... Is it possible to have one "source of data" for the enums and array?

for example:
- I want to have a enum type
- and an array

but I want to define one source of truth. At the moment I define 'limited','low','medium','high' 3 times and I have a lot of such "data-classes"

const myArray: string[] = [
    'limited',
    'low',
    'medium',
    'high'
];
type MyStringEnumType =
    'limited'
    | 'low'
    | 'medium'
    | 'high';

enum MyEnum
{
    Limited = 'limited',
    Low = 'low',
    Medium = 'medium',
    High = 'high'
}

type Both = MyStringEnumType | MyEnum;

let testVar1: Both = MyEnum.Limited; // works
let testVar2: Both = 'limited'; // works
console.log(myArray[0], myArray.length); // works

Thanks!

Greetings crazyx13th

Possible duplicate of (or related to) TypeScript String Union to String Array — jcalz
– jcalz, Commented Sep 5, 2018 at 18:45
I'll call it a duplicate. Possible duplicate of TypeScript String Union to String Array — Matt McCutchen
– Matt McCutchen, Commented Sep 5, 2018 at 18:56
The above code seems to be right, is there any issue or problem? — Reza
– Reza, Commented Sep 5, 2018 at 18:58
@RezaRahmati: it's because I have a lot of such classes with some data and I wanna have "one source of truth", not double define a dataset. thx! — crazyx13th
– crazyx13th, Commented Sep 6, 2018 at 6:02

crazyx13th · Accepted Answer · 2018-09-06 07:43:08Z

0

OK, thx to smnbbrv I found a "ok" version (without "MyStringEnumType")

now I have a enum
and a array

export class ComplexityOptions
{
    public static get Values()
    {
        return Object.keys(ComplexityOptions.Option).map((key: any) => (ComplexityOptions.Option[key]));
    }
}

export module ComplexityOptions
{
    export enum Option
    {
        Limited = 'limited',
        Low = 'low',
        Medium = 'medium',
        High = 'high'
    }
}

answered Sep 6, 2018 at 7:43

crazyx13th

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