import { Request } from '@strata-js/strata';
import { type ZodError, type ZodType } from 'zod';
export type ZodPayloadValidationSchema<T> = {
    [K in keyof T]: T[K] extends (arg: any) => any ? ZodType<Parameters<T[K]>[0]> : never;
};
export type ZodErrorTree = {
    errors: string[];
    properties?: Record<string, ZodErrorTree>;
    items?: (ZodErrorTree | null)[];
    unionErrors?: ZodErrorTree[];
};
export declare class ZodPayloadValidationMiddleware<T> {
    #private;
    constructor(schema: ZodPayloadValidationSchema<T>, errorFormatter?: (error: ZodError) => unknown);
    beforeRequest(request: Request): Promise<Request | undefined>;
}