import type { Context } from 'koa';
import type { KoaContext, Controller } from '../routes/types';
import type { ApiResponse, ApiOptions, ApiResponseBody } from '../types/api';
export interface Validator<T = Record<string, unknown>> {
    (params: T): {
        valid: boolean;
        error?: string;
    };
}
export interface ControllerOptions<T = Record<string, unknown>, TApiOptions extends ApiOptions = ApiOptions> {
    validator?: Validator<T>;
    buildApiOptions?: (ctx: KoaContext, params: T) => TApiOptions;
    errorMessage?: string;
    onError?: (ctx: KoaContext, error: unknown) => void;
    name?: string;
}
export declare function createController<T extends ApiOptions>(apiFunction: (props: T) => Promise<ApiResponse>, options?: ControllerOptions<Record<string, unknown>, T>): Controller;
export declare function validateRequired(fields: string[]): Validator;
export declare function setApiResponse(ctx: Context, apiResponse: ApiResponse<ApiResponseBody>): void;
export declare function withErrorHandler(handler: (ctx: KoaContext) => Promise<void>, name?: string): (ctx: KoaContext, next: () => Promise<void>) => Promise<void>;