Uncaught (in promise) TypeError: Cannot read property '$$' of null about svelte-forms-lib HOT 3 OPEN

Thank you for the pointer, @pateketrueke: this sounds like a plausible explanation. I failed to mention that I am actually using webpack, but since I am in the process of looking for a suitable solution, I will look for similar configuration, and report back here if I find a viable option. This may help others in the same situation.

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I have performed some research, and I can confirm @pateketrueke's advice: in my case, using webpack 5 with svelte-loader, this is clearly documented, and I obviously missed it. For rollup (which I do not use) I found some references here.

svelte-forms-lib correctly provides the svelte entrypoint (main field), and my tests confirm that this solves the problem (using [email protected]).

More documentation about the mainFields settings can be found

• for webpack 5, here;
• for rollup, here.

To the maintainers of svelte-forms-lib: this solves the issue, which can probably be closed, although I advise to track sveltejs/svelte#6584. Thank you for the wonderful work on this library!

from svelte-forms-lib.

The issue is how your bundler resolves the svelte sources, as said on their documentation, they should read the .svelte sources and not the compiled ones.

In your sandbox, you can read something like this:

new Form
https://lke5ek.csb.app/node_modules/svelte-forms-lib/build/index.mjs:900:5

That's pointing out that we're not loading from the ./lib folder (which contains the .svelte sources) but from ./build so the problem is not svelte per-se, the settings of your bundler are responsible of that.

I would think that your sandbox (or may be your code/bundler/settings) are using the module option from any package.json being resolved, which, in this case actually points to "module": "./build/index.mjs" and such...

Check out the documentation fot the rollup's resolve plugin, and for the mainFields option.

I had this kind of issues before, but as soon I started to configure my bundler as expected (I use esbuild) then the issue gone.

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