ow/source/ow.ts

import * as is from '@sindresorhus/is';
import { ArgumentError } from './lib/argument-error';
import { Predicate } from './lib/predicates/predicate';
import { StringPredicate } from './lib/predicates/string';

export interface Ow {
	(value: any, predicate: Predicate): void;
	/**
	 * Test the value to be a string.
	 */
	string?: StringPredicate;
}

export const ow: Ow = (value: any, predicate: Predicate) => {
	for (const { validator, message } of predicate.validators) {
		if (!validator(value)) {
			// TODO: Modify the stack output to show the original `ow()` call instead of this `throw` statement
			throw new ArgumentError(message(value), ow);
		}
	}
};

Object.defineProperty(ow, 'string', {
	get: () => new StringPredicate()
});