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

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

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

export type Observe = _.Record<(typeof $Observe), [symbol, _ptr], _ptr>;

export type _ptr = never;

export type _val = _.Value<_ptr>;


export function isObserve(v: any): v is Observe {
    return (
        _.Record.isRecord<_val, _.Tuple<_val>, _ptr>(v) &&
        _.is(v.label, $Observe) &&
        ((v.length === 2) && typeof v[0] === 'symbol' && _.isPointer(v[1]))
    );
}

export function asObserve(v: any): Observe {
    if (!isObserve(v)) {throw new TypeError(`Invalid Observe: ${_.stringify(v)}`);} else {return v;};
}