import { Result } from "../result";
import { RuntimeType } from "../issues/shared";
import { OpaqueType } from "../type";
export type InstanceOfIssue = {
    readonly kind: "instance-of";
    readonly expectedClass: string | undefined;
    readonly subject: RuntimeType;
};
export type Constructor<T> = Function & {
    prototype: T;
};
export declare class InstanceOf<T> extends OpaqueType<T> {
    readonly klass: Constructor<T>;
    constructor(klass: Constructor<T>);
    check(val: any): Result<T>;
}
export declare function instanceOf<T>(klass: Constructor<T>): InstanceOf<T>;