import * as _ from "@preserves/core";

export const $Instance = Symbol.for("Instance");

export const Instance = _.Record.makeConstructor<{"_field0": string, "_field1": _val}, _ptr>()($Instance, ["_field0","_field1"]);

export type Instance = _.Record<(typeof $Instance), [string, _val], _ptr>;

export type _ptr = never;

export type _val = _.Value<_ptr>;


export function isInstance(v: any): v is Instance {
    return (
        _.Record.isRecord<_val, _.Tuple<_val>, _ptr>(v) &&
        _.is(v.label, $Instance) &&
        ((v.length === 2) && typeof v[0] === 'string' && true)
    );
}

export function asInstance(v: any): Instance {
    if (!isInstance(v)) {throw new TypeError(`Invalid Instance: ${_.stringify(v)}`);} else {return v;};
}