How can you retrieve the keys of an object that conforms to an interface?

In the following demonstration, we have two objects - KEYS and KEYS2. When importing KEYS in index.ts, autocomplete suggestions are available for K1 and K2 because KEYS does not adhere to an interface.

On the other hand, with KEYS2, autocomplete is not provided as it implements an interface.

To access the StackBlitz demo, click here.

export interface IKeyObject {
  [key:string]: IKeyValue | any
} 

export interface IKeyValue {
  key:string
  value:any
}

export const KEYS = {
  K1: 'K1',
  K2: 'K2'
}

export const KEYS2:IKeyObject = {
  K1: { key:'', value:''},
  K2: {key:'', value:''}
}

Is there a method to apply the interface while also enabling autocomplete for object keys simultaneously?

For instance, if we import KEYS2 and utilize it in a constructor:

constructor() {
    const v = KEYS.
}

VSCode should provide us with the object properties as autocomplete suggestions?
  

Answer №1

To ensure everything works properly, consider making your KEYS an enum and your IKeyObject a Record.

There is only one type issue remaining - the usage of IKeyValue | any, which essentially just resolves to any.

export enum KEYS {
  K1 = "K1",
  K2 = "K2"
}
export type IKeyObject = Record<KEYS, IKeyValue | any>;

export interface IKeyValue {
  key: string;
  value: any;
}

export const KEYS2: IKeyObject = {
  K1: { key: "", value: "" },
  K2: { key: "", value: "" }
};

By following these suggestions, you should be able to utilize autocomplete on KEYS2 with K1 and K2 as options. Removing any from IKeyObject will further enhance autocomplete functionality.

Check out this Stackblitz Example that showcases all the mentioned modifications, including the elimination of any.

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