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Introduce of custom transports leads to deserialize not working on server side #13675

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gurpreetatwal opened this issue Apr 4, 2025 · 0 comments · May be fixed by #13686
Open

Introduce of custom transports leads to deserialize not working on server side #13675

gurpreetatwal opened this issue Apr 4, 2025 · 0 comments · May be fixed by #13686
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bug Something isn't working

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@gurpreetatwal
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Describe the bug

Prior to @sveltejs/[email protected] I was able to use the deserialize function in server side routes to parse the response returned by calling svelte kit action methods using fetch. If relevant, my specific use case is a route that runs automates filling out some forms for the user based on the response from an LLM. I use deserialize to parse the response from the action.

Attempting to upgrade to any version >= 2.11.0 (including latest 2.20.3 as of April 3) results in all server side usages of deserialize throwing the following error:

Cannot read properties of undefined (reading 'decoders')
TypeError: Cannot read properties of undefined (reading 'decoders')
    at deserialize (/node_modules/@sveltejs/kit/src/runtime/app/forms.js:37:84)
    at load (/src/routes/load/+page.server.js:17:74)
    at async load_server_data (/node_modules/@sveltejs/kit/src/runtime/server/page/load_data.js:45:18)
    at async Promise.all (index 1)
    at async render_data (/node_modules/@sveltejs/kit/src/runtime/server/data/index.js:101:17)
    at async resolve (/node_modules/@sveltejs/kit/src/runtime/server/respond.js:443:17)
    at async respond (/node_modules/@sveltejs/kit/src/runtime/server/respond.js:329:20)
    at async file:///node_modules/@sveltejs/kit/src/exports/vite/dev/index.js:521:22

I ran npm run build and npm run preview results in the same error as well.

deserialize still works when used client side (.svelte) files but does not work in any server.js/ts files.

Reproduction

Logs

Cannot read properties of undefined (reading 'decoders')
TypeError: Cannot read properties of undefined (reading 'decoders')
    at deserialize (/node_modules/@sveltejs/kit/src/runtime/app/forms.js:37:84)
    at load (/src/routes/load/+page.server.js:17:74)
    at async load_server_data (/node_modules/@sveltejs/kit/src/runtime/server/page/load_data.js:45:18)
    at async Promise.all (index 1)
    at async render_data (/node_modules/@sveltejs/kit/src/runtime/server/data/index.js:101:17)
    at async resolve (/node_modules/@sveltejs/kit/src/runtime/server/respond.js:443:17)
    at async respond (/node_modules/@sveltejs/kit/src/runtime/server/respond.js:329:20)
    at async file:///node_modules/@sveltejs/kit/src/exports/vite/dev/index.js:521:22

Cannot read properties of undefined (reading 'decoders')
TypeError: Cannot read properties of undefined (reading 'decoders')
    at deserialize (file:///.svelte-kit/output/server/chunks/forms.js:6:50)
    at load (file:///.svelte-kit/output/server/entries/pages/load/_page.server.js:12:37)
    at async load_server_data (file:///.svelte-kit/output/server/index.js:621:18)
    at async Promise.all (index 1)
    at async render_data (file:///.svelte-kit/output/server/index.js:1965:19)
    at async resolve2 (file:///.svelte-kit/output/server/index.js:2977:22)
    at async respond (file:///.svelte-kit/output/server/index.js:2882:22)
    at async file:///node_modules/@sveltejs/kit/src/exports/vite/preview/index.js:197:5

System Info

System:
    OS: Linux 5.15 Ubuntu 22.04.5 LTS 22.04.5 LTS (Jammy Jellyfish)
    CPU: (8) x64 Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
    Memory: 11.96 GB / 31.28 GB
    Container: Yes
    Shell: 5.8.1 - /usr/bin/zsh
  Binaries:
    Node: 22.13.1 - ~/.local/share/nodejs/bin/node
    Yarn: 1.22.22 - ~/.local/share/nodejs/bin/yarn
    npm: 10.9.2 - ~/.local/share/nodejs/bin/npm
    pnpm: 9.1.0 - ~/.local/share/nodejs/bin/pnpm
  Browsers:
    Chrome: 135.0.7049.52
  npmPackages:
    @sveltejs/adapter-node: ^5.2.12 => 5.2.12
    @sveltejs/kit: ^2.10.0 => 2.10.0
    @sveltejs/vite-plugin-svelte: ^3.1.2 => 3.1.2
    svelte: ^4.2.19 => 4.2.19
    vite: ^5.4.10 => 5.4.11

Severity

blocking an upgrade

Additional Information

Probably related to #13149
@eltigerchino eltigerchino added the bug Something isn't working label Apr 7, 2025
@eltigerchino eltigerchino linked a pull request Apr 7, 2025 that will close this issue
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fix: correctly deserialize on the server sveltejs/kit
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@gurpreetatwal @eltigerchino