export interface IImportStrategy<TInput extends object, TAttributesDto extends object> {
    /**
     * Transforms a raw input object (from an API, CSV row, etc.)
     * into a standardized DTO.
     */
    transform(input: TInput): Promise<TAttributesDto>;
    /**
     * Validates the standardized DTO.
     * @throws {Error} or a custom exception if validation fails.
     */
    validate(data: TAttributesDto): Promise<void>;
}
/**
 * A base class (framework) that provides partial logic for an Import Strategy.
 * Users can extend this class to save effort.
 */
export declare abstract class BaseImportStrategy<TInput extends object, TAttributesDto extends object> implements IImportStrategy<TInput, TAttributesDto> {
    transform(input: TInput): Promise<TAttributesDto>;
    validate(data: TAttributesDto): Promise<void>;
    /**
     * Recursively flattens validation errors into a single array of strings.
     * @param errors The array of ValidationError objects.
     * @param parentPath The path of the parent property, used for building nested paths.
     * @returns An array of human-readable error strings.
     */
    private flattenValidationErrors;
}