'ERR_PACKAGE_PATH_NOT_EXPORTED'

[jamesb93]

I have a long working project with mdsvex and sapper. After running yarn run dev today I get this error:

node:internal/process/promises:227
          triggerUncaughtException(err, true /* fromPromise */);
          ^

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './compiler.js' is not defined by "exports" in /Users/james/dev/webdev/phd-sapper/node_modules/svelte/package.json
    at new NodeError (node:internal/errors:329:5)
    at throwExportsNotFound (node:internal/modules/esm/resolve:315:9)
    at packageExportsResolve (node:internal/modules/esm/resolve:540:3)
    at resolveExports (node:internal/modules/cjs/loader:473:36)
    at Function.Module._findPath (node:internal/modules/cjs/loader:513:31)
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:911:27)
    at Function.Module._load (node:internal/modules/cjs/loader:769:27)
    at Module.require (node:internal/modules/cjs/loader:997:19)
    at require (node:internal/modules/cjs/helpers:92:18)
    at Object.<anonymous> (/Users/james/dev/webdev/phd-sapper/node_modules/rollup-plugin-svelte/index.js:11:4) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}
error Command failed with exit code 1.

I have tried using the package.json from the npx command here: https://github.com/pngwn/sapper-mdsvex-template
but I still get the error after trashing node_modules the yarn.lock and reinstall all the modules with yarn. Default projects work, but I cannot seem to figure out where my project differs.

You can view the code here:

https://github.com/jamesb93/phd-sapper

[pngwn]

This looks like a problem caused by a more recent node version.

Could you try updating your svelte version to latest and seeing if this error persists?

[jamesb93]

I tried yarn upgrade svelte and yarn upgrade svelte --latest with no luck. I think you are right though, I did brew update && brew upgrade recently so thats the only moving part here.

[jamesb93]

Oh, and yes. I am using node 15.7.

[pngwn]

Could you also try updating rollup-plugin-svelte? That seems to be source of the error.

I know what this is, I'm just not sure where it is coming from. I'll debug a little more later with a later version of node.

[jamesb93]

Okay some progress! These warnings appear amongst some recommendations on unused CSS.

[rollup-plugin-svelte] Unknown "dev" option. Please use "compilerOptions" for any Svelte compiler configuration.
[rollup-plugin-svelte] Unknown "hydratable" option. Please use "compilerOptions" for any Svelte compiler configuration.
[rollup-plugin-svelte] Unknown "hydratable" option. Please use "compilerOptions" for any Svelte compiler configuration.
[rollup-plugin-svelte] Unknown "generate" option. Please use "compilerOptions" for any Svelte compiler configuration.
[rollup-plugin-svelte] Unknown "dev" option. Please use "compilerOptions" for any Svelte compiler configuration.

And my site now shows:

[pngwn]

The plot thickens.

[jamesb93]

Indeed! Let me know what else to try and test if you have the time to spare.

[jamesb93]

Oh and some more info from the same error:

Error: Cannot find module '/Users/james/dev/webdev/phd-sapper/__sapper__/dev/server/server.js'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:925:15)
    at Function.Module._load (node:internal/modules/cjs/loader:769:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
    at node:internal/main/run_main_module:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

[jamesb93]

Would it be worth me just rolling back Node to a version you know works?

[jamesb93]

Okay I rolled back to 14.15.4 x64 builds. I then found this issue which details the same issue. Updating rollup-plugin-svelte to 6.1.1 fixed the problem, while updating to the latest did not.

[jamesb93]

Going to close this as it seems its about managing the Rollup/Svelte version appropriately :)