Export interface as Partial<OtherInterface>

Question

I have an interface defined like below:

export interface Iface {
   id: string;
   foo: string;
}

I want to create an interface that's a partial of Iface and export it. I tried

export interface PartialIface = Partial<Iface>;

but typescript complains of a partial error. If I change the interface keyword to type it works. How come I have to declare it as a type alias and not an interface?

export type PartialIface = Partial<Iface>;

Answer 1

Please take a look:

export interface Iface {
   id: string;
   foo: string;
}

export type PartialFace=Partial<Iface>

Also You can copy paste your interface and make all properties optional:

export interface Iface {
   id?: string;
   foo?: string;
}

I'm not aware about other approaches