remote function build issues sveltekit @ 2.39.0 and up (tested up to and including 2.42.0)

[vipero07]

Describe the bug

Running vite build works in sveltekit @2.38.1 but fails in 2.39.0 -> 2.41.0 versions the issue appears to occur due to changes in https://github.com/sveltejs/kit/blob/3120d170b157b5a00369b3ee66d3cbe4d3c6fc03/packages/kit/src/exports/vite/index.js

These are the errors I am seeing:

[plugin vite-plugin-sveltekit-remote] Sourcemap is likely to be incorrect: a plugin (vite-plugin-sveltekit-remote) was used to transform files, but didn't generate a sourcemap for the transformation. Consult the plugin documentation for help (x4)

and

node:internal/event_target:1101
  process.nextTick(() => { throw err; });
                           ^
ReferenceError [Error]: Cannot access 'info_v2' before initialization
    at file:///Users/em/Dev/app/.svelte-kit/output/server/chunks/remote-eooeoj.js:1288:91
    at ModuleJob.run (node:internal/modules/esm/module_job:345:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:651:26)
    at async analyse (file:///Users/em/Dev/app/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:51:19)
    at async MessagePort.<anonymous> (file:///Users/em/Dev/app/node_modules/@sveltejs/kit/src/utils/fork.js:23:16)

Reproduction

This is difficult to reproduce as it seems to only occur when the generated remote files are large and split into multiple files.

Logs

System Info

System:
    OS: macOS 15.6
    CPU: (12) arm64 Apple M2 Max
    Memory: 988.89 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.19.0 - ~/.volta/tools/image/node/22.19.0/bin/node
    Yarn: 4.9.4 - ~/.volta/tools/image/yarn/4.9.4/bin/yarn
    npm: 11.6.0 - ~/.volta/tools/image/npm/11.6.0/bin/npm
    bun: 1.2.0 - ~/.volta/bin/bun
  Browsers:
    Brave Browser: 121.1.62.156
    Edge: 140.0.3485.66
    Safari: 18.6
  npmPackages:
    @sveltejs/adapter-node: ^5.3.2 => 5.3.2 
    @sveltejs/enhanced-img: ^0.8.1 => 0.8.1 
    @sveltejs/kit: 2.41.0 => 2.41.0 
    @sveltejs/vite-plugin-svelte: ^6.2.0 => 6.2.0 
    svelte: 5.38.10 => 5.38.10 
    vite: 7.1.5 => 7.1.5

Severity

blocking an upgrade

Additional Information

Not that this helps much but the line in question occurs in what is essentially a compiled version of a bunch of drizzle queries in one big file. Specifically it looks like this.

const { date: _info_date, ...provider_info_v2_columns } = getTableColumns(info_v2);

Well above that line 1288, on line 27 is

import { i as info_v2, ... } from "./remote-12p15ba.js";

And that remote file seems to be the drizzle schema, at the end of the file.

export {
  info_v2 as i,
  ...
}

So the output seems correct but for whatever reason it is complaining that the drizzle table has not yet been initialized, which leads me to believe it is attempting to run the code in the build environment without the imports.

[dummdidumm]

The additional information part might or might not be related to #14439

[vipero07]

The additional information part might or might not be related to #14439

I just checked against the fix for that in 2.42.0 and the error is still occuring =/ I'm trying to figure out a good way to repro this. I feel it may be related to 14430 since that issue happens with the same version.

[vipero07]

I think these changes are the cause. @sveltejs/kit@2.38.1...@sveltejs/kit@2.39.0#diff-beef34c36ed87d7835d0166655010910fba9949a6ef95042cb468d7d73423816

One more thing I forgot to mention, the issue doesn't occur in vite dev, it is a vite build specific issue.

[dummdidumm]

2.42.0 didn't contain the fix yet, 2.42.1 which I just released does. Could you check again?

[vipero07]

I've got good news and bad news. That fixes the cannot access before initialization error. However it has been replaced with the following:

node:internal/event_target:1101
  process.nextTick(() => { throw err; });
                           ^
RangeError [Error]: Maximum call stack size exceeded
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:259:16)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)
    at visit (file:///Users/eitanmiller/Dev/platform/node_modules/@sveltejs/kit/src/core/postbuild/analyse.js:271:5)

also the sourcemap warning is still present (though admitantly unrelated)

[dummdidumm]

We really need a minimum reproduction (or any kind of reproduction) in that case.

[vipero07]

I'm going to try and figure something out tonight to do so, that or I'll stuff logs into my node packages.

[vipero07]

Still can't reproduce... but I have some more insight, the call stack is exceeding because it gets trapped in a loop inside the postbuild/analyse visit function. I added a simple console.log to the id and it looks like this:

_remote-eooeoj.js
_app-server.js
_remote-12p15ba.js
_app-server.js
_app-server.js
_app-shared-server.js
_remote-qn5w1w.js
_app-server.js
_remote-eooeoj.js
_app-server.js
_remote-12p15ba.js
_app-server.js
_app-shared-server.js
_remote-qn5w1w.js
_app-server.js
_remote-eooeoj.js
_app-server.js
_remote-12p15ba.js
_app-server.js
_app-shared-server.js
_remote-qn5w1w.js
_app-server.js
_remote-eooeoj.js

The remote files have references like this:
12p15ba -> qn5w1w -> eooeoj -> 12p15ba

I added a very basic set to ensure ids are not run more than once and the build compiles and application runs. I don't think this is the correct fix as something else is causing the visit imports to circular reference, but its a simple quick fix that works. Incoming PR that illustrates this fix (albeit, not how to reproduce the problem yet).

[Adaphath]

I am experiencing this too in my project but with a slightly different error from version 2.39.0 and up to 2.42.1.

Error:

node:internal/event_target:1101
  process.nextTick(() => { throw err; });
                           ^
TypeError [Error]: Cannot convert undefined or null to object
    at Function.values (<anonymous>)
    at prerender (file:///<PROJECTPATH>/node_modules/.pnpm/@sveltejs+kit@2.42.1_@sveltejs+vite-plugin-svelte@6.1.0_svelte@5.38.10_vite@7.0.6_@type_daa69acea58dced3953c6ac836d08a26/node_modules/@sveltejs/kit/src/core/postbuild/prerender.js:498:27)
    at async MessagePort.<anonymous> (file:///<PROJECTPATH>/node_modules/.pnpm/@sveltejs+kit@2.42.1_@sveltejs+vite-plugin-svelte@6.1.0_svelte@5.38.10_vite@7.0.6_@type_daa69acea58dced3953c6ac836d08a26/node_modules/@sveltejs/kit/src/utils/fork.js:23:16)

I can fix this by adding just the prerender import from $app/server in my .remote. files.
I am unsure about how it is related to the build issues mentioned here but wanted to bring it up in this context.

[vipero07]

I am experiencing this too in my project but with a slightly different error from version 2.39.0 and up to 2.42.1.

Error:

node:internal/event_target:1101
process.nextTick(() => { throw err; });
^
TypeError [Error]: Cannot convert undefined or null to object
at Function.values ()
at prerender (file:////node_modules/.pnpm/@sveltejs+kit@2.42.1_@sveltejs+vite-plugin-svelte@6.1.0_svelte@5.38.10_vite@7.0.6_@type_daa69acea58dced3953c6ac836d08a26/node_modules/@sveltejs/kit/src/core/postbuild/prerender.js:498:27)
at async MessagePort. (file:////node_modules/.pnpm/@sveltejs+kit@2.42.1_@sveltejs+vite-plugin-svelte@6.1.0_svelte@5.38.10_vite@7.0.6_@type_daa69acea58dced3953c6ac836d08a26/node_modules/@sveltejs/kit/src/utils/fork.js:23:16)
I can fix this by adding just the prerender import from $app/server in my .remote. files. I am unsure about how it is related to the build issues mentioned here but wanted to bring it up in this context.

I'm pretty certain the PR I made above won't address this, but I do think this is related, specifically to how sveltekit is chunking remote functions. In my project, for whatever reason, the remote functions get chunked into a doom loop. Where as yours get chunked in such a way that some variable becomes undefined.