import { type SchemaBase } from "../schema.js";
/**
 * When catching errors, you can use something like `error instanceof CheckError` to determine if
 * the error is from a failed call to `check`.
 */
export declare class CheckError extends TypeError {
}
/**
 * @param x The value to check
 * @param schema The schema to check against
 * @throws {CheckError} when the provided value does not match the schema
 */
export declare function check<T>(x: unknown, schema: SchemaBase<T>): asserts x is T;
export { check as guard };