import ImageRegistry from '@splunk/visualization-context/ImageRegistry';
export interface DownloadProgress {
    bytesDownloaded: number;
    contentLength?: number;
    message: string;
}
export interface IDownloader {
    downloadWithProgress(url: string, complete: (svg: string) => void, progress?: (p: DownloadProgress) => void, error?: (msg: string, error?: Error) => void): void | Promise<void>;
}
export declare const b64DecodeUnicode: (base64Data: string) => string;
export declare class ImageRegistryFetcher implements IDownloader {
    context: ImageRegistry;
    constructor(context?: ImageRegistry);
    downloadWithProgress(url: string, complete: (svg: string) => void, progress?: (p: DownloadProgress) => void, error?: (msg: string, error?: Error) => void): Promise<void>;
}
export declare class URLDownloader implements IDownloader {
    downloadWithProgress(url: string, complete: (svg: string) => void, progress?: (p: DownloadProgress) => void, error?: (msg: string, error?: Error) => void): void;
}
export default class Downloader {
    private downloaders;
    constructor(downloaders: {
        [protocol: string]: IDownloader;
    });
    downloadWithProgress(url: string, complete: (svg: string) => void, progress?: (p: DownloadProgress) => void, error?: (msg: string, error?: Error) => void): void;
}