import { FileValidatorContext } from './file-validator-context.interface';
import { FileValidator } from './file-validator.interface';
import { IFile } from './interfaces';
type MaxFileSizeValidatorContext = FileValidatorContext<Omit<MaxFileSizeValidatorOptions, 'errorMessage' | 'message'>>;
export type MaxFileSizeValidatorOptions = {
    /**
     * Maximum allowed file size in bytes.
     */
    maxSize: number;
    /**
     * @deprecated Use `errorMessage` instead.
     */
    message?: string | ((maxSize: number) => string);
    /**
     * Custom error message returned when file size validation fails.
     * Can be provided as a static string, or as a factory function
     * that receives the validation context (file and validator configuration)
     * and returns a dynamic error message.
     *
     * @example
     * // Static message
     * new MaxFileSizeValidator({ maxSize: 1000, errorMessage: 'File size exceeds the limit' })
     *
     * @example
     * // Dynamic message based on file object and validator configuration
     * new MaxFileSizeValidator({
     *   maxSize: 1000,
     *   errorMessage: ctx => `Received file size is ${ctx.file?.size}, but it must be smaller than ${ctx.config.maxSize}.`
     * })
     */
    errorMessage?: string | ((ctx: MaxFileSizeValidatorContext) => string);
};
/**
 * Defines the built-in MaxSize File Validator
 *
 * @see [File Validators](https://docs.nestjs.com/techniques/file-upload#file-validation)
 *
 * @publicApi
 */
export declare class MaxFileSizeValidator extends FileValidator<MaxFileSizeValidatorOptions, IFile> {
    buildErrorMessage(file?: IFile): string;
    isValid(file?: IFile): boolean;
}
export {};