I am building a backend project in my monorepo, which is using some internal workspace packages and api handler at apps/backend/api/index.ts. I was expecting the vercel to magically build the app, but getting bundle resolution errors:

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Cannot find module '/var/task/apps/backend/node_modules/@recalio/db/index.ts'
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Did you forget to add it to "dependencies" in `package.json`?
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Node.js process exited with exit status: 1. The logs above can help with debugging the issue.

Project url: https://backend-recalio.vercel.app/api Framework: just api folder with api handler exported. Project settings: this is my vercel json file:

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{
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	"version": 2,
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	"builds": [
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		{
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			"src": "api/index.ts",
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			"use": "@vercel/node"
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		}
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	],
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	"routes": [
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		{
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			"src": "/api/(.*)",
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			"dest": "api/index.ts"
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		}
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	]
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}

I am seeking guidance on how to resolve this issue or any similar experiences and solutions that others might have encountered in this community. Thank you for your assistance!