Better generated client

generated.ts

export type Response<Tag, Data = never> = {
    tag: Tag;
    data: Data;
};

const parseEmpty = <T>(tag: T) => (_: any): Response<T> => ({
    tag,
    data: null as never,
});

const endpoint = <R>({}: {
    parsers: {[key: number]: (data: any) => R};
}): (() => Promise<R>) => {
    return async (): Promise<R> => {
        // TODO
    }
}

export type UserResponse = Response<"user", User>;

export type User = {
	shippingPort: string | null;
	preferences: string[];
	id: string;
	email: string;
}

const parseUser = (data: any): UserResponse => ({
	tag: "user",
	data: {
		shippingPort: data.shipping_port,
		preferences: data.preferences ?? [],
		id: data.id,
		email: data.email,
	}
});

export type NotFoundResponse = Response<"not_found">;

export type GetUserResponse = UserResponse | NotFoundResponse;

export const getUser = endpoint<GetUserResponse>({
	parsers: {
		200: parseUser,
		404: parseEmpty("not_found"),
	},
});