External deps resolution fails

[codechips]

🐛 Bug Report

Seems like Parcel does not bundle Svelte internals correctly for external packages that rely on them. Everything builds correctly, but then I get a clientside error:

Uncaught TypeError: store.subscribe is not a function
    at Object.subscribe (index.mjs:41)
    at V (yrv.min.js:1)
    at Object.init (index.mjs:1350)
    at new W (yrv.min.js:1)
    at create_fragment (App.svelte:236)
    at init (index.mjs:1364)
    at new App (App.svelte:300)
    at Object.parcelRequire.main.js../App.svelte (main.js:3)
    at newRequire (main.1f19ae8e.js:47)
    at main.1f19ae8e.js:81

External package in question: https://github.com/pateketrueke/yrv

I think it's a Parcel error because it works fine with Rollup. Per default Parcel grabs pkg.browser entry and if that doesn't exist it grabs pkg.module. Both of them give the same error. However, in external package there is also pkg.svelte that points to the raw source. When pointing to that entry (removing pkg.browser and manually pointing pkg.module to src/index.js directly in node_modules dir) everything works.

From what I saw in Svelte plugin code pkg.svelte is used for compiler options. I am also not aware of any bundler that uses pkg.svelte entry point during package resolution and I don't know what is considered a standard, so TBH I am not sure why the author put it there in the first place and what purpose it serves.

🎛 Configuration (.svelterc, package.json, cli command)

Available in code sample.

To reproduce run the command below and check the browser's dev console:

yarn parcel serve src/index.html --port 3000 --log-level 4 --no-cache

💻 Code Sample

https://github.com/iljoo/svelte-parcel-yrv-bug

🌍 Your Environment

Yarn, plus latest and greatest Parcel and Svelte.

[codechips]

Closing as this seems to be resolved somehow somewhere in the dependency chain 🙃