Pfthb

So I have an enum which contains a set of strings

export enum apiErrors 
 INVALID_SHAPE = "INVALID_SHAPE",
 NOT_FOUND = "NOT_FOUND",
 EXISTS = "EXISTS",
 INVALID_AUTH = "INVALID_AUTH",
 INTERNAL_SERVER_ERROR = "INTERNAL_SERVER_ERROR"

I defined an interface like below

export interface IApiResponse "NOT_FOUND" and so on...

I know I can define just like "INVALID_SHAPE" | "NOT_FOUND" ...

But is there a way to de-structure the enum to errorCode so that it can accept only one of those strings?

As @JBNizet and @AviadP mentioned, just set errorCode to the apiErrors enum. Typescript will automatically ensure that anything that implements the IApiResponse interface has errorCode set to be one of those values.

export enum apiErrors 
 INVALID_SHAPE = "INVALID_SHAPE",
 NOT_FOUND = "NOT_FOUND",
 EXISTS = "EXISTS",
 INVALID_AUTH = "INVALID_AUTH",
 INTERNAL_SERVER_ERROR = "INTERNAL_SERVER_ERROR"


export interface IApiResponse 
 status: boolean;
 payload: any;
 errorCode?: apiErrors // this is the change


// this would now be invalid
const invalidResponse: IApiResponse = 
 status: false,
 payload: foo: 'bar',
 errorCode: 'something not in the enum',
;

// this is valid
const validResponse: IApiResponse = 
 status: false,
 payload: foo: 'bar',
 errorCode: apiErrors.INVALID_SHAPE,
;

// this is also valid
const anotherValidResponse: IApiResponse = 
 status: true,
 payload: foo: 'bar',
 // errorCode isn't included at all
;