The output file path, directory,buffer, or stream-like object. If the path exists and is a file, it will be overwritten.
If the file path is undefined or Buffer, then the result
will be saved in memory and returned as Buffer.
The dcId that the file belongs to. Used to borrow a sender from that DC. The library should handle this for you
The file size that is about to be downloaded, if known.
Only used if progressCallback is specified.
How much to download in each chunk. The larger the less requests to be made. (max is 512kb).
Progress callback accepting one param. (progress :number) which is a float between 0 and 1
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Low level interface for downloading files