"use strict";

const ValidationError = require("@validatem/error");
const isString = require("@validatem/is-string");

module.exports = [
	isString,
	function isLowercase(value) {
		// By applying a case transformation and then comparing, instead of eg. using a regular expression, we outsource the decision of "what counts as lowercase" to the JS runtime (which means we don't need to worry about things like non-obvious cases in non-English writing systems)
		if (value.toLowerCase() !== value) {
			throw new ValidationError(`Must be all-lowercase`);
		}
	}
];