动态 TypeScript 键名

Question

I am using TypeScript and i am wondering how can i "type" the following object.

{
    "code": 52,
    "somerandomstring123":"Some Data"
}

The thing is, that the KEY NAME somerandomstring123 is dynamically generated string and is not constant. So for example, the JSON could've been like this:

{
    "code": 52,
    "someOTHERstring456":"Some Data"
}

I tried using [key:string]: string like this:

interface SomeObjectData {
code: number;
[target: string]: string;
}

but it returns an error of: Property 'code' of type 'number' is not assignable to 'string' index type 'string'.

Answer 1

you can use the union type for the target.

interface SomeObjectData {
    [target: string]: string | number;
    code: number;
}

const data:SomeObjectData = { code: 12}

Answer 2

Try this:

type SomeObjectData = {
  [key: string]: string; // dynamic properties
} & {
  code: number; // static properties
};