How can a generic type be defined in TypeScript that can have any property with a certain type?

edit

In TypeScript, a generic type that can have any property with a certain type can be defined using an index signature.

Syntax:

type MyGenericType<T> = {
  [key: string]: T;
}

This creates a type MyGenericType that takes a generic type parameter T, with an index signature that maps any string key to a value of type T.

Example:

interface MyInterface {
  name: string;
  age: number;
}

type MyGenericType<T> = {
  [key: string]: T;
}

const myObj: MyGenericType<MyInterface> = {
  foo: { name: "John", age: 25 },
  bar: { name: "Jane", age: 30 }
};

Here, the type MyGenericType takes the interface MyInterface as a generic type parameter and creates an object myObj with two properties, "foo" and "bar", both of type MyInterface. The index signature allows any additional properties with type MyInterface to be added to the object.