export type Type = 'string' | 'number' | 'bigint' | 'boolean' | 'symbol' | 'undefined' | 'object' | 'function';
export declare class AssertionError<E = unknown, A = unknown> extends Error implements AssertOptionalParams<E, A> {
    /**
     * Expected value for the assertion.
     */
    readonly expected: E;
    /**
     * Received value for the assertion.
     */
    readonly actual: A;
    /**
     * Optional operator used for the assertion.
     */
    readonly operator?: string;
    constructor(expected: E, actual: A, operator?: string);
}
/**
 * The shape of the assertion options.
 */
export interface AssertOptionalParams<E, A> {
    /**
     * Expected value for the assertion.
     */
    readonly expected: E;
    /**
     * Received value for the assertion.
     */
    readonly actual: A;
    /**
     * Optional operator used for the assertion.
     */
    readonly operator?: string;
}