"use strict";

// FIXME: Package separately under @validatem/

const isFunction = require("@validatem/is-function");
const ValidationError = require("@validatem/error");

module.exports = [
	isFunction,
	(func) => {
		let current = func.prototype;

		while (current != null) {
			if (current === Error.prototype) {
				return;
			}

			current = Object.getPrototypeOf(current);
		}

		throw new ValidationError(`Must be an error constructor`);
	}
];