import { Middleware } from '../Middleware';
import { Request } from '../Request';
import { Response } from '../Response';
/**
 * Convert empty strings to null middleware.
 * Automatically converts empty string inputs in the request body to null.
 */
export declare class ConvertEmptyStringsToNull implements Middleware {
    /**
     * Handle an incoming request.
     */
    handle(request: Request, next: (request: Request) => Promise<Response> | Response): Promise<Response>;
    /**
     * Clean the given data.
     */
    protected clean(data: any): void;
}
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