fix: Cannot access _uploader before initialization

[susnux]

If the variable is declared using let or const we need to initialize it explicitly before it can be accessed - even if we access it using instanceof.

So current beta.9 is not usable :/

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (af4f4ac) 33.50% compared to head (327cf57) 33.50%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #879   +/-   ##
=======================================
  Coverage   33.50%   33.50%           
=======================================
  Files           6        6           
  Lines         200      200           
  Branches       31       31           
=======================================
  Hits           67       67           
  Misses        131      131           
  Partials        2        2           

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