/**
 * Error that may get thrown when an invariant assummption fails.
 * @public
 */
export declare class InvariantError extends Error {
    /**
     * @internal
     */
    framesToPop: number;
    /**
     * @internal
     */
    name: string;
    /**
     * @internal
     */
    constructor(message?: string);
}
/**
 * @internal
 * @param condition - any truthy condition to assert
 * @param message  - optional message to use if the condition is falsy
 */
export declare function invariant(condition: any, message?: string): asserts condition;