//#region src/core/validator.ts
const string = (value) => typeof value === "string";
const number = (value) => typeof value === "number";
const boolean = (value) => typeof value === "boolean";
const bigint = (value) => typeof value === "bigint";
/** Matches an instance of the given constructor. */
function instanceOf(ctor) {
	return (value) => value instanceof ctor;
}
/** Matches when any of the given validators match. */
function union(...validators) {
	return (value) => {
		for (let i = 0, len = validators.length; i < len; i++) if (validators[i](value)) return true;
		return false;
	};
}
/** Matches the given validator or `undefined`. */
function optional(validator) {
	return (value) => value === void 0 || validator(value);
}
/** Matches an array whose items each match `item`. */
function array(item) {
	return (value) => {
		if (!Array.isArray(value)) return false;
		for (let i = 0, len = value.length; i < len; i++) if (!item(value[i])) return false;
		return true;
	};
}
/**
* Matches an object whose declared keys each pass their validator. Extra keys
* are not checked.
*/
function object(shape) {
	const keys = Object.keys(shape);
	return (value) => {
		if (value == null || typeof value !== "object") return false;
		for (let i = 0, len = keys.length; i < len; i++) {
			const key = keys[i];
			if (!shape[key](Reflect.get(value, key))) return false;
		}
		return true;
	};
}
//#endregion
export { array, bigint, boolean, instanceOf, number, object, optional, string, union };