Each Database entity has their own unique id, let's assume that id presented as a string:

type IdLike = {
   id: string;
}

type Book = IdLike & {
   title: string;
}

type User = IdLike & {
   email: string;
}

The developer would like to implement the function that would log id for entities and started with the following function

const log = <T>(entity: T) {
   // ❌ Error Property 'id' does not exist on type 'T'
   console.log(entity.id); 
}

But Typescript compiler threw an error in a line when developer tried to get access to id property. In the code editor you will see highlighted error on the line 2. You should fix this error.