What is the best way to create a straightforward interface using TypeScript?

Although I'm sure this question has been asked before, I couldn't find the answer on Google or SO. So here it goes:

I am looking to create an interface with a key named id of type number. Additionally, there may be other keys with unknown names and string values.

This is what I have tried so far:

export interface MyInterface {
  id: number
  [key: string]: string
}

However, I am getting the following error message:

Property 'id' of type 'number' is not assignable to string index type 'string'.

Is there a way to make this work?

typescript

Answer №1

Here is an update:

After researching, I came across this GitHub issue: https://github.com/Microsoft/TypeScript/issues/10042

Furthermore, the documentation on indexable types can be found here:

https://www.typescriptlang.org/docs/handbook/interfaces.html#indexable-types

According to the documentation,

they also enforce that all properties match their return type.

It seems like your issue may not have a straightforward resolution!

I suggest considering the following solution:

export interface MyInterface {
    id: number;
    [key: string]: string | number;
}

This implementation ensures that the type of id remains secure.

https://i.sstatic.net/qW3HQ.png

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