open https://www.typescriptlang.org/play/ & paste this code.

index.ts

interface Hello {
    hello(): string;
}
interface Named {
    name: string;
}

function parrot<T extends Named>(obj: T): T {
    return obj;
}

parrot({
    name: "TypeScript",
});
parrot({
    name: "TypeScript",
    age: 5,
});
parrot({
    name: "TypeScript",
    age: function () { },
});
parrot({
    name: "TypeScript",
    sayHello() {
        console.log(`Hello, ${this.name}`);
    },
});