What does auto std.stdio.File.ByChunkImpl byChunk (ulong chunkSize ); mean?

[kdevel]

On Friday, 3 August 2018 at 17:27:07 UTC, Adam D. Ruppe wrote:
> But remember, this is documentation that just happens to look 
> like code, so it is intended to be legible by people rather 
> than the compiler.

I could not find any elucidation of the meaning of

    auto <type>

when used as a return type of a function.

> (that said, it isn't how I would have written it.)

You would have removed the auto?