class MaxFileSizeValidator extends FileValidator {
  buildErrorMessage(): string
  isValid(file: any): boolean

  // inherited from nest/packages/common/FileValidator
  constructor(validationOptions: TValidationOptions)
  protected validationOptions: TValidationOptions
  abstract isValid(file?: any): boolean | Promise<boolean>
  abstract buildErrorMessage(file: any): string
}

buildErrorMessage(): string

isValid(file: any): boolean