来自枚举不同类型的 Typescript 接口键

Question

I have list of properties that should be as a keys of interfaces with different types. How better to implement them? I want not to allowed to use properties that not exist in enum.

export enum Properties = {prop1, prop2, prop3}

export interface PropsInterface {
  prop1: Type1;
  prop2: Type2;
  prop3: string;
}


// Usage exanple. 
// I have object of properties. Each of property can be updated separatelly.

let props: PropsInterface = {
   prop1: null,
   prop2: null,
   prop3: null
}

let fieldToUpdate {
   field: Properties = Properties.prop1,
   value: Type1 = 'Some data matching to Type1'
}

props[fieldToUpdate.field] = fieldToUpdate.value;

Answer 1

You should use mapped types :

export enum Properties { prop1, prop2, prop3 }

// type PropsInterface = {
//     0: "any type";
//     1: "any type";
//     2: "any type";
// }
type PropsInterface = {
    [Prop in Properties]: 'any type'
}

Please keep in mind, that enums are numerical by the default,

You can also use string as enum values:

export enum Properties { prop1 = 'a', prop2 = 'b', prop3 = 'c' }

// type PropsInterface = {
//     a: "any type";
//     b: "any type";
//     c: "any type";
// }
type PropsInterface = {
    [Prop in Properties]: 'any type'
}