import { JsonCompiler } from '@biesbjerg/ng2-translate-extract/dist/compilers/json.compiler';
import { TranslationCollection } from '@biesbjerg/ng2-translate-extract/dist/utils/translation.collection';
export declare class XlsxUtils {
    compiler: JsonCompiler;
    filesFromFolder(jsonFolder: string): string[];
    toJsonMap(jsonFolder: string): Map<string, TranslationCollection>;
    jsonMapToExcel(translationsPerLanguageMap: Map<string, TranslationCollection>): any;
    writeExcelToFile(wb: any, file: string): void;
    addKeyValueToMap(key: string, value: string, collectionName: string, map: Map<string, TranslationCollection>): Map<string, TranslationCollection>;
    jsonToXlsx(jsonFolder: string): void;
}