[@web/test-runner] Very basic Solid.js example not working inside Web Test Runner unit test #2985

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1. trusktr commented on Sep 27, 2025

   

   trusktr

   on Sep 27, 2025

   Last edited by trusktr

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   A workaround is to change this,

   import { createEffect } from "solid-js"
   import { createMutable } from "solid-js/store"

   to this

   // import { createEffect } from "solid-js"
   // import { createMutable } from "solid-js/store"
   
   const { createEffect } = await eval('import("solid-js")')
   const { createMutable } = await eval('import("solid-js/store")')

   and it works!

   To workaround missing type definitions due to eval, I can do this:

   const { createEffect } = /** @type {typeof import("solid-js")} */ (await eval('import("solid-js")')) 
   const { createMutable } = /** @type {typeof import("solid-js/store")} */ (await eval('import("solid-js/store")'))

   It appears that WTR's default build is transforming the code (f.e. the import statements) that leads to the breakage for some reason. Importing natively, based on the importmap pointing to CDN, works fine.

   (I have solid-js installed locally only for making type definitions available.)
2. trusktr commented on Sep 27, 2025

   

   trusktr

   on Sep 27, 2025

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   It would be nicer if I could disable all source transformation to keep native import working as expected:

   • [@web/test-runner] How do we disable all source transforms? #2986