Classes leaking into story

[dasDaniel]

Describe the bug
It appears that some classes are leaking into the story,

To Reproduce
Use a component with a loader class

System

Environment Info:

  System:
    OS: Windows 10 10.0.19042
    CPU: (8) x64 Intel(R) Core(TM) i7-10610U CPU @ 1.80GHz  
  Binaries:
    Node: 14.17.3 - C:\Program Files\nodejs\node.EXE        
    npm: 6.14.13 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.19041.1266.0), Chromium (96.0.1054.34)
  npmPackages:
    @storybook/addon-actions: ^6.4.0 => 6.4.0
    @storybook/addon-essentials: ^6.4.0 => 6.4.0
    @storybook/addon-links: ^6.4.0 => 6.4.0
    @storybook/addon-postcss: ^2.0.0 => 2.0.0
    @storybook/addon-svelte-csf: ^1.1.0 => 1.1.0
    @storybook/svelte: ^6.4.0 => 6.4.0

[shilman]

@MichaelArestad @tmeasday is it possible that this is a bug introduced in the docs loading PR?

See comment here 90d7978#r60943719

Repro available here #16545 (comment)

[dasDaniel]

re #16545
Even though the .loader class stems from a more recent commit, it appears that the underlying issue may be the same, so this can probably be closed.

[shilman]

Closing as dupe to #16545