Re-export the viewer function as a named export.

[cbeer]

Silences the build warning:

Entry module "src/index.js" is using named and default exports together.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.07%. Comparing base (7e8b0f8) to head (3578245).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4103      +/-   ##
==========================================
+ Coverage   95.05%   95.07%   +0.02%     
==========================================
  Files         315      317       +2     
  Lines       15907    15974      +67     
  Branches     2494     2509      +15     
==========================================
+ Hits        15121    15188      +67     
  Misses        782      782              
  Partials        4        4              

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