/**
 * functions that can or should be overwritten by plugins
 * IMPORTANT: Do not import any big stuff from RxDB here!
 * An 'overwritable' can be used inside WebWorkers for RxStorage only,
 * and we do not want to have the full RxDB lib bundled in them.
 */
import type { DeepReadonly } from './types/util.d.ts';
export declare const overwritable: {
    /**
     * if this method is overwritten with one
     * that returns true, we do additional checks
     * which help the developer but have bad performance
     */
    isDevMode(): boolean;
    /**
     * Deep freezes and object when in dev-mode.
     * Deep-Freezing has the same performance as deep-cloning, so we only do that in dev-mode.
     * Also, we can ensure the readonly state via typescript
     * @link https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
     */
    deepFreezeWhenDevMode<T>(obj: T): DeepReadonly<T>;
    /**
     * overwritten to map error-codes to text-messages
     */
    tunnelErrorMessage(message: string): string;
};