Storybook 6.5.5: "Cannot create property 'parameters' on string" when using string export with .trim(), even if excluded using excludeStories

[ashmind]

Describe the bug
If I have an export that is a trimmed string, Storybook fails even if it is excluded using excludeStories.

export default {
    component: MyComponent,
    excludeStories: ['EXAMPLE_STRING']
};

export const EXAMPLE_STRING = 'Example'.trim();

Unexpected error while loading ./Fail.stories.tsx: Cannot create property 'parameters' on string 'Example'
 TypeError: Cannot create property 'parameters' on string 'Example'
    at Module../stories/Fail.stories.tsx (http://localhost:6007/main.iframe.bundle.js:341:27)
    at __webpack_require__ (http://localhost:6007/runtime~main.iframe.bundle.js:854:30)
    at fn (http://localhost:6007/runtime~main.iframe.bundle.js:151:20)
    at webpackContext (http://localhost:6007/main.iframe.bundle.js:226:9)
    at http://localhost:6007/vendors~main.iframe.bundle.js:15732:29
    at Array.forEach (<anonymous>)
    at http://localhost:6007/vendors~main.iframe.bundle.js:15730:18
    at Array.forEach (<anonymous>)
    at executeLoadable (http://localhost:6007/vendors~main.iframe.bundle.js:15729:10)
    at executeLoadableForChanges (http://localhost:6007/vendors~main.iframe.bundle.js:15778:20)

The issue does not happen if export does not call .trim().

To Reproduce
Repo: https://github.com/ashmind/bugs-storybook-trim-string-export/tree/main/stories
See:

• Fail.stories.tsx for failure
• Success.stories.tsx for similar cases that do not fail

System

Environment Info:
  System:
    OS: Windows 10 10.0.19044
    CPU: (4) x64 Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz
  Binaries:
    Node: 16.14.2 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.10 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 8.5.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 101.0.4951.67
    Edge: Spartan (44.19041.1266.0), Chromium (101.0.1210.53)

[shilman]

We’re cleaning house! Storybook has changed a lot since this issue was created and we don’t know if it’s still valid. Please open a new issue referencing this one if:

• this is still a problem in SB 7.x
• you can provide a consistent reproduction in 7.x (at https://storybook.new/ or per repro docs).