adapter-node doesn't work correctly with segmented builds

[Joris Willems]

Describe the bug

When you segment the Dockerfile into multiple parts it won't run the node web server correctly. This is because the bundled files are referencing the node_modules outside the build directory.

If I run the following command:

head -c 1000 build/server/chunks/_page.svelte-B66aaGbY.js.map

I will get the following output:

{"version":3,"file":"_page.svelte-B66aaGbY.js","sources":["../../../node_modules/qrcode-generator/qrcode.js","../../../node_modules/dequal/dist/index.mjs","../../../node_modules/nanoid/non-secure/index.js","../../../node_modules/@floating-ui/utils/dist/floating-ui.utils.mjs","../../../node_modules/@floating-ui/core/dist/floating-ui.core.mjs","../../../node_modules/@floating-ui/utils/dist/floating-ui.utils.dom.mjs","../../../node_modules/@floating-ui/dom/dist/floating-ui.dom.mjs","../../../node_modules/tabbable/dist/index.esm.js","../../../node_modules/focus-trap/dist/focus-trap.esm.js","../../../node_modules/immutable-json-patch/lib/esm/typeguards.js","../../../node_modules/immutable-json-patch/lib/esm/utils.js","../../../node_modules/immutable-json-patch/lib/esm/immutabilityHelpers.js","../../../node_modules/immutable-json-patch/lib/esm/jsonPointer.js","../../../node_modules/immutable-json-patch/lib/esm/immutableJSONPatch.js","../../../node_modules/immutable-json-patch/lib/esm/revertJ⏎   

Then if I visit the web page it will return a 500 error.

Reproduction

You can toggle the following comments in the Dockerfile and see that the version that is not segmented is working but the segmented version is not:

#FROM node:22-bookworm AS builder
FROM node:22-bookworm

WORKDIR /app

COPY . .

# Clean install all node modules
RUN npm ci

# Build SvelteKit app
RUN npm run build

#FROM node:22-bookworm AS deployer

#WORKDIR /app

#COPY --from=builder /app/build build/
#COPY --from=builder /app/package.json .

EXPOSE 3000

ENV NODE_ENV=production

CMD [ "node", "build" ]

On the segmented version it will return a 500 error when trying to visit the web page.

Logs

No response

System Info

System:
    OS: Linux 6.9 Arch Linux
    CPU: (12) x64 AMD Ryzen 5 6600U with Radeon Graphics
    Memory: 10.57 GB / 14.81 GB
    Container: Yes
    Shell: 3.7.1 - /usr/bin/fish
  Binaries:
    Node: 22.3.0 - /usr/bin/node
    Yarn: 1.22.21 - /usr/bin/yarn
    npm: 10.8.1 - /usr/bin/npm
    pnpm: 8.12.0 - /usr/bin/pnpm
  Browsers:
    Brave Browser: 124.1.65.133
  npmPackages:
    @sveltejs/adapter-node: ^5.2.0 => 5.2.0 
    @sveltejs/kit: ^2.0.0 => 2.5.17 
    @sveltejs/vite-plugin-svelte: ^3.0.0 => 3.1.1 
    svelte: ^4.2.7 => 4.2.18 
    vite: ^5.1.7 => 5.3.2

Severity

annoyance

Additional Information

No response

[Conduitry]

We'll need a proper (minimal) reproduction. Sourcemaps referring to files that don't exist on the filesystem will not itself make anything fail.

[Joris Willems]

svelte-problem.tar.gz
I have here the source code, I tried to make a barebone project but it works there. So here is the source code, it inside of a private repo so only the frontend is zipped.

The error I get:

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'tailwind-merge' imported from /app/build/server/chunks/_page.svelte-B66aaGbY.js
    at packageResolve (node:internal/modules/esm/resolve:841:9)
    at moduleResolve (node:internal/modules/esm/resolve:914:18)
    at defaultResolve (node:internal/modules/esm/resolve:1119:11)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:541:12)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:510:25)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:240:38)
    at ModuleJob._link (node:internal/modules/esm/module_job:126:49) {
  code: 'ERR_MODULE_NOT_FOUND'
}

[Conduitry]

Prod dependencies in your package.json are runtime dependencies of your app: https://kit.svelte.dev/docs/adapter-node#deploying If you're not installing them in your final stage, they won't be there.

[Joris Willems]

Ok but how should my Dockerfile look then, because I'm confused, the following file also doesn't work:

FROM node:22-bookworm AS builder
#FROM node:22-bookworm-slim

WORKDIR /app

COPY . .

# Clean install all node modules
RUN npm ci

# Build SvelteKit app
RUN npm run build

FROM node:22-bookworm AS deployer

WORKDIR /app

COPY --from=builder /app/build build/
COPY --from=builder /app/package.json .
COPY --from=builder /app/package-lock.json .
COPY --from=builder /app/node_modules .

# Clean install all node modules
RUN npm ci --omit dev

EXPOSE 3000

ENV NODE_ENV=production

CMD [ "node", "build" ]