Communicate interface inheritance omission with type definition

You can easily tell members about inheritance omissions using TypeScript type definitions.You can check the sample introduced here.

Suppose you have the following type definition:

interface CustomError {
    error?: {
        message:string,
        code:string,
    }
}

interface Response {
    user: {
        name: string
    }
}

type API = <T extends unknown>(req?: Request) => T 

Response needs to inherit from CustomError, but you can't understand it without reading the type definition carefully.
In such a case, I will tell you the technique to easily tell the user.

Add a message prompting inheritance to the type definition.

type API = <T extends unknown>(req?: Request) 
=> T extends CustomError 
? T : 'CustomError interface inheritance required'

The user can notice because a message prompting inheritance is displayed in the response when using.

I don't think it's the intended use, Maybe you should know it as one technique.