Prettify Typescript types, so we can see deep enough

prettify.ts

type Prettify<T> = { [K in keyof T]: T[K] } & {};

class Hello {
    id?: number;
    name?: string;
    created_at?: string;

    getFullName() {
        return this.name;
    }
}

type ItWorks = Prettify<InstanceType<typeof Hello>>;

type Dto = Omit<InstanceType<typeof Hello>, 'id' | 'created_at'>;