import type { OnModuleInit } from '@nestjs/common';
import type { Handler, Request } from 'express';
import type { GraphQLError } from 'graphql';
import type { TFunction } from 'i18next';
export interface PickerTranslationResources {
    error: any;
    errorResult: any;
    message: any;
}
export interface I18nRequest extends Request {
    t: TFunction;
}
export declare class I18nService implements OnModuleInit {
    onModuleInit(): Promise<TFunction<"translation", undefined>>;
    handle(): Handler;
    addTranslationFile(langKey: string, filePath: string): void;
    addTranslation(langKey: string, resources: PickerTranslationResources | any): void;
    translateError(req: I18nRequest, error: GraphQLError): GraphQLError;
    translateErrorResult(req: I18nRequest, error: any): void;
}