import { default as LegacyFormData } from 'form-data';
import { StorageUploadResponse } from './types';

/** Convert any string into ISO-8859-1 */
export declare const toIso88591: (fileName: string) => string;
export declare const fetchUpload: (backendUrl: string, data: FormData | LegacyFormData, { accessToken, name, fileId, bucketId, adminSecret, onUploadProgress, headers: initialHeaders }?: {
    accessToken?: string;
    name?: string;
    fileId?: string;
    bucketId?: string;
    adminSecret?: string;
    onUploadProgress?: (event: {
        total: number;
        loaded: number;
    }) => void;
    headers?: Record<string, string>;
}) => Promise<StorageUploadResponse>;
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