After run `vercel dev` in local, and a request came in, terminal will output a lot of ts error of `d.ts` files in node_modules

Help
1

there is nothing to do with my deploy, but only local-dev envirnment.

微信图片_2024-11-12_155157_446
微信图片_2024-11-12_155157_4463008×1502 253 KB

env:

  • vercel 37.12.1

package.json:

{
  "name": "vercel-serverless",
  "version": "1.0.1",
  "description": "",
  "main": "index.js",
  "scripts": {
    "vercel": "vercel dev",
    "postinstall": "prisma generate"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@fastify/type-provider-typebox": "^5.0.1",
    "@types/node": "^18.0.0",
    "@vercel/node": "^2.6.1",
    "prisma": "^5.7.1",
    "ts-node": "10.9.2",
    "typescript": "4.9.5"
  },
  "dependencies": {
    "@fastify/autoload": "^5.0.0",
    "@fastify/sensible": "^5.0.0",
    "@prisma/client": "^5.22.0",
    "dotenv": "^16.0.3",
    "fastify": "^4.9.2",
    "fastify-cli": "^5.5.1",
    "fastify-plugin": "^4.0.0"
  },
  "overrides": {
    "@vercel/node": {
      "ts-node": "10.9.2",
      "typescript": "5.6.2"
    }
  }
}
2

Hi, @xhfkindergarten! Welcome to the Vercel Community :smile:

Based on the specific errors you’re seeing with Fastify’s type definitions, this is likely a TypeScript configuration issue.

You can try running the development server with the --ignore-ts-errors flag as a temporary solution:

 vercel dev --ignore-ts-errorsvercel dev --ignore-ts-errors

But it might want to check your package versions to ensure compatibility:

 npm list fastify @types/node typescriptnpm list fastify @types/node typescript

Make sure your Fastify version and TypeScript version are compatible. You might want to update to the latest stable versions:

 npm install fastify@latest typescript@latest @types/node@latestnpm install fastify@latest typescript@latest @types/node@latest

Let us know how you get on!

3

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Thanks, pawlean. actually my dependencies were already latest.

here is a minimal demo that can reproduct this.

4

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