import { Fn } from '../Fn';
import { Option } from '../types';
import { IfInvoking, Input } from '../utils';
export interface IsSome<T> extends Fn<Option<T>, boolean> {
    out: IfInvoking<this, InvokeIsSome<T, Input<this>>, boolean>;
}
export type InvokeIsSome<T, In extends Option<T>> = In['some'];