Trouble deploying an old (~1.5 years) Svelte 3 + SvelteKit 1 application to Vercel

[bzm3r]

I have an old Svelte 3 application, which I want to make a tiny update to: https://github.com/bzm3r/npch

The update is only in the CSV sheets read by the Svelte application.

I am deploying it to Vercel.

I have to use npm install --legacy-peer-deps as the install command on Vercel otherwise installation of @sveltejs/adapter-vercel fails.

Also, my project was using Node 16.x, so I "updated" it to use Node 18.x as the runtime on Vercel.

Now I am getting the following build errors, which I do not understand (full logs attached):

[21:43:18.749] �[31merror during build:
[21:43:18.749] TypeError: builder.findServerAssets is not a function or its return value is not iterable
[21:43:18.749]     at generate_serverless_function (file:///vercel/path0/node_modules/@sveltejs/adapter-vercel/index.js:95:33)
[21:43:18.750]     at async Object.adapt (file:///vercel/path0/node_modules/@sveltejs/adapter-vercel/index.js:310:5)
[21:43:18.750]     at async adapt (file:///vercel/path0/node_modules/@sveltejs/kit/src/core/adapt/index.js:37:2)
[21:43:18.750]     at async finalise (file:///vercel/path0/node_modules/@sveltejs/kit/src/exports/vite/index.js:810:7)
[21:43:18.750]     at async Object.handler (file:///vercel/path0/node_modules/@sveltejs/kit/src/exports/vite/index.js:840:5)
[21:43:18.750]     at async PluginDriver.hookParallel (file:///vercel/path0/node_modules/rollup/dist/es/shared/node-entry.js:25466:17)
[21:43:18.750]     at async Object.close (file:///vercel/path0/node_modules/rollup/dist/es/shared/node-entry.js:26726:13)
[21:43:18.750]     at async build (file:///vercel/path0/node_modules/vite/dist/node/chunks/dep-b2890f90.js:48095:13)
[21:43:18.751]     at async CAC.<anonymous> (file:///vercel/path0/node_modules/vite/dist/node/cli.js:842:9)�[39m
[21:43:18.784] Error: Command "npm run build --legacy-peer-deps" exited with 1
[21:43:19.358] 

I found this GitHub issue which is relevant: #12564 ... but I am using "svelte": "^3.54.0" so I'm not sure what action to take.

I would very much appreciate ideas on what to do next.

Full error logs:

[21:42:56.695] Running build in Washington, D.C., USA (East) – iad1
[21:42:56.875] Cloning github.com/bzm3r/npch (Branch: main, Commit: 747f3c7)
[21:42:57.426] Previous build cache not available
[21:42:57.602] Cloning completed: 726.678ms
[21:42:57.906] Running "vercel build"
[21:42:58.435] Vercel CLI 37.12.0
[21:42:59.188] Running "install" command: `npm install --legacy-peer-deps`...
[21:43:03.903] 
[21:43:03.904] added 147 packages, and audited 148 packages in 4s
[21:43:03.905] 
[21:43:03.905] 29 packages are looking for funding
[21:43:03.905]   run `npm fund` for details
[21:43:03.913] 
[21:43:03.914] 3 vulnerabilities (2 low, 1 moderate)
[21:43:03.914] 
[21:43:03.914] To address all issues (including breaking changes), run:
[21:43:03.916]   npm audit fix --force
[21:43:03.916] 
[21:43:03.916] Run `npm audit` for details.
[21:43:05.911] 
[21:43:05.912] > [email protected] build
[21:43:05.912] > vite build
[21:43:05.912] 
[21:43:06.716] 
[21:43:06.717] �[36mvite v4.5.5 �[32mbuilding SSR bundle for production...�[36m�[39m
[21:43:06.747] transforming...
[21:43:07.767] �[32m✓�[39m 81 modules transformed.
[21:43:07.865] rendering chunks...
[21:43:08.088] 
[21:43:08.089] �[36mvite v4.5.5 �[32mbuilding for production...�[36m�[39m
[21:43:08.095] transforming...
[21:43:11.175] �[32m✓�[39m 271 modules transformed.
[21:43:11.422] rendering chunks...
[21:43:11.591] computing gzip size...
[21:43:11.611] �[2m.svelte-kit/output/client/�[22m�[32m_app/version.json                             �[39m�[1m�[2m  0.03 kB�[22m�[1m�[22m�[2m │ gzip:   0.05 kB�[22m
[21:43:11.611] �[2m.svelte-kit/output/client/�[22m�[32m.vite/manifest.json                           �[39m�[1m�[2m  2.24 kB�[22m�[1m�[22m�[2m │ gzip:   0.43 kB�[22m
[21:43:11.614] �[2m.svelte-kit/output/client/�[22m�[35m_app/immutable/assets/2.8cbe000d.css          �[39m�[1m�[2m  3.93 kB�[22m�[1m�[22m�[2m │ gzip:   1.34 kB�[22m
[21:43:11.614] �[2m.svelte-kit/output/client/�[22m�[36m_app/immutable/chunks/index.dbc9a461.js       �[39m�[1m�[2m  0.45 kB�[22m�[1m�[22m�[2m │ gzip:   0.31 kB�[22m
[21:43:11.614] �[2m.svelte-kit/output/client/�[22m�[36m_app/immutable/nodes/0.f192624c.js            �[39m�[1m�[2m  0.55 kB�[22m�[1m�[22m�[2m │ gzip:   0.37 kB�[22m
[21:43:11.614] �[2m.svelte-kit/output/client/�[22m�[36m_app/immutable/nodes/1.e895ae0e.js            �[39m�[1m�[2m  0.98 kB�[22m�[1m�[22m�[2m │ gzip:   0.57 kB�[22m
[21:43:11.615] �[2m.svelte-kit/output/client/�[22m�[36m_app/immutable/chunks/singletons.ba5521ef.js  �[39m�[1m�[2m  2.46 kB�[22m�[1m�[22m�[2m │ gzip:   1.27 kB�[22m
[21:43:11.615] �[2m.svelte-kit/output/client/�[22m�[36m_app/immutable/entry/app.c3abd920.js          �[39m�[1m�[2m  5.74 kB�[22m�[1m�[22m�[2m │ gzip:   2.29 kB�[22m
[21:43:11.615] �[2m.svelte-kit/output/client/�[22m�[36m_app/immutable/chunks/index.62610ab9.js       �[39m�[1m�[2m  8.58 kB�[22m�[1m�[22m�[2m │ gzip:   3.45 kB�[22m
[21:43:11.615] �[2m.svelte-kit/output/client/�[22m�[36m_app/immutable/entry/start.e5551165.js        �[39m�[1m�[2m 25.31 kB�[22m�[1m�[22m�[2m │ gzip:   9.98 kB�[22m
[21:43:11.616] �[2m.svelte-kit/output/client/�[22m�[36m_app/immutable/nodes/2.b2918e26.js            �[39m�[1m�[2m481.06 kB�[22m�[1m�[22m�[2m │ gzip: 194.97 kB�[22m
[21:43:11.616] �[32m✓ built in 3.52s�[39m
[21:43:11.793] �[2m.svelte-kit/output/server/�[22m�[32m.vite/manifest.json                       �[39m�[1m�[2m 1.62 kB�[22m�[1m�[22m
[21:43:11.793] �[2m.svelte-kit/output/server/�[22m�[35m_app/immutable/assets/_page.8cbe000d.css  �[39m�[1m�[2m 3.93 kB�[22m�[1m�[22m
[21:43:11.794] �[2m.svelte-kit/output/server/�[22m�[36minternal.js                               �[39m�[1m�[2m 0.19 kB�[22m�[1m�[22m
[21:43:11.794] �[2m.svelte-kit/output/server/�[22m�[36mentries/fallbacks/layout.svelte.js        �[39m�[1m�[2m 0.24 kB�[22m�[1m�[22m
[21:43:11.794] �[2m.svelte-kit/output/server/�[22m�[36mentries/fallbacks/error.svelte.js         �[39m�[1m�[2m 0.89 kB�[22m�[1m�[22m
[21:43:11.794] �[2m.svelte-kit/output/server/�[22m�[36mchunks/index.js                           �[39m�[1m�[2m 1.33 kB�[22m�[1m�[22m
[21:43:11.794] �[2m.svelte-kit/output/server/�[22m�[36mchunks/index2.js                          �[39m�[1m�[2m 4.50 kB�[22m�[1m�[22m
[21:43:11.794] �[2m.svelte-kit/output/server/�[22m�[36mchunks/internal.js                        �[39m�[1m�[2m 5.45 kB�[22m�[1m�[22m
[21:43:11.794] �[2m.svelte-kit/output/server/�[22m�[36mentries/pages/_page.svelte.js             �[39m�[1m�[2m44.74 kB�[22m�[1m�[22m
[21:43:11.794] �[2m.svelte-kit/output/server/�[22m�[36mindex.js                                  �[39m�[1m�[2m91.91 kB�[22m�[1m�[22m
[21:43:11.797] 
[21:43:11.797] Run npm run preview to preview your production build locally.
[21:43:11.800] 
[21:43:11.800] > Using @sveltejs/adapter-auto
[21:43:11.968] Installing @sveltejs/adapter-vercel...
[21:43:16.262] npm warn deprecated [email protected]: This package is no longer supported.
[21:43:16.273] npm warn deprecated [email protected]: This package is no longer supported.
[21:43:16.445] npm warn deprecated [email protected]: This package is no longer supported.
[21:43:16.816] 
[21:43:16.816] added 60 packages, and audited 208 packages in 5s
[21:43:16.817] 
[21:43:16.817] 32 packages are looking for funding
[21:43:16.817]   run `npm fund` for details
[21:43:16.832] 
[21:43:16.833] 3 vulnerabilities (2 low, 1 moderate)
[21:43:16.833] 
[21:43:16.833] To address all issues (including breaking changes), run:
[21:43:16.833]   npm audit fix --force
[21:43:16.833] 
[21:43:16.834] Run `npm audit` for details.
[21:43:16.945] Successfully installed @sveltejs/adapter-vercel.
[21:43:16.946] 
[21:43:16.946] If you plan on staying on this deployment platform, consider replacing @sveltejs/adapter-auto with @sveltejs/adapter-vercel. This will give you faster and more robust installs, and more control over deployment configuration.
[21:43:16.946] 
[21:43:18.749] �[31merror during build:
[21:43:18.749] TypeError: builder.findServerAssets is not a function or its return value is not iterable
[21:43:18.749]     at generate_serverless_function (file:///vercel/path0/node_modules/@sveltejs/adapter-vercel/index.js:95:33)
[21:43:18.750]     at async Object.adapt (file:///vercel/path0/node_modules/@sveltejs/adapter-vercel/index.js:310:5)
[21:43:18.750]     at async adapt (file:///vercel/path0/node_modules/@sveltejs/kit/src/core/adapt/index.js:37:2)
[21:43:18.750]     at async finalise (file:///vercel/path0/node_modules/@sveltejs/kit/src/exports/vite/index.js:810:7)
[21:43:18.750]     at async Object.handler (file:///vercel/path0/node_modules/@sveltejs/kit/src/exports/vite/index.js:840:5)
[21:43:18.750]     at async PluginDriver.hookParallel (file:///vercel/path0/node_modules/rollup/dist/es/shared/node-entry.js:25466:17)
[21:43:18.750]     at async Object.close (file:///vercel/path0/node_modules/rollup/dist/es/shared/node-entry.js:26726:13)
[21:43:18.750]     at async build (file:///vercel/path0/node_modules/vite/dist/node/chunks/dep-b2890f90.js:48095:13)
[21:43:18.751]     at async CAC.<anonymous> (file:///vercel/path0/node_modules/vite/dist/node/cli.js:842:9)�[39m
[21:43:18.784] Error: Command "npm run build --legacy-peer-deps" exited with 1
[21:43:19.358]