/**
 * Return the estimated download speed (bytes/second).  Result is cached.
 * Result is crude estimate since it's a single test file (small sample, only ~2MB), but is a valid test (since it's a Synapse file on s3).
 * The intent is to let the user know if the package download will take many hours to download.
 * @param accessToken
 */
export declare const testDownloadSpeed: (accessToken: string) => Promise<number>;
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