CODEWITHSUNDEEP
typescript
bugtype kr
bugtype kr

Reputation: 455

How to convert union type to enum in typescript?

I want to covert union type to enum or like enum in typescript

It doesn't work out with my brain.

Thank you for reading my question.

type status = 'start' | 'loading' | 'stop';

class Loading {
    static staticStatus: status;
}
Loading.staticStatus.start; // i want to use.

or

type status = 'start' | 'loading' | 'stop';

enum statusEnum = ?????;

class Loading {
    static staticStatus = statusEnum;
}
Loading.staticStatus.start; // i want to use.

I'm sorry I didn't write my questions in detail.

const schema ={
 status: Joi.string()
        .required()
        .valid(
            'start',
            'loading',
            'stop',
        )
}

// type setStatusType =  'start' | 'loading' | 'stop' is like this
type setStatusType = PickType<Joi.extractType<typeof schema>, 'status'>; 

enum statusEnum = ?????;

class Loading {
    static staticStatus = statusEnum;

    public setLoading() {
    this.status = Loading.staticStatus.loading // I want to use this.
    }
}

so I want to covert union type to enum...

Upvotes: 40

Views: 29312

Answers (2)

Pablo
Pablo

Reputation: 83

In my case, i use next

import { IExternal } from 'external';

enum Types = {
   FIRST = 'first',
   SECOND = 'second'
}

interface IInternal extends Pick<IExternal, 'types'> {
    types: Types
}

IExternal['types'] === 'first' | 'second' | 'something' | 'else';

IInternal['types'] === 'first' | 'second'; and compatible with IExternal['types']

It allow you to use types from union as enum values and give you compatible check.

Upvotes: -1

Mateusz Siniarski
Mateusz Siniarski

Reputation: 1015

Not sure how you would get an enum from a Union but you can easily do the reverse if you need both.

enum Status {
 start,
 loading,
 stop
}

type StatusAsUnion = keyof typeof Status

Hopefully this was useful

Upvotes: 37

Related Questions