Unwanted typescript errors when dev server is started

Describe the bug

Note that I am running vite under a monorepo setup, specifically using pnpm workspaces. I just bootstrapped the app with react-ts and vite-plugin-checker is the only plugin installed. I can see the following error

5:27:36 AM [vite] vite.config.ts changed, restarting server...
5:27:36 AM [vite] server restarted.

 ERROR(TypeScript)  Duplicate identifier 'Prepend'.
 FILE  /home/<USER>/project/node_modules/.pnpm/@types+eslint@7.29.0/node_modules/@types/eslint/helpers.d.ts:1:6

  > 1 | type Prepend<Tuple extends any[], Addend> = ((_: Addend, ..._1: Tuple) => any) extends (..._: infer Result) => any
      |      ^^^^^^^
    2 |     ? Result
    3 |     : never;
    4 |

 ERROR(TypeScript)  Duplicate identifier 'Prepend'.
 FILE  /home/<USER>/project/node_modules/.pnpm/@types+eslint@8.4.1/node_modules/@types/eslint/helpers.d.ts:1:6

  > 1 | type Prepend<Tuple extends any[], Addend> = ((_: Addend, ..._1: Tuple) => any) extends (..._: infer Result) => any
      |      ^^^^^^^
    2 |     ? Result
    3 |     : never;
    4 |

[TypeScript] Found 2 errors. Watching for file changes.

Screenshot:

This is my config file:

import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import checker from 'vite-plugin-checker'

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [react(), checker({
    typescript: {
      root: '.', tsconfigPath: 'tsconfig.json'
    }
  })],
  server: {
    host: '0.0.0.0',
    port: 3000,
  }
})

Reproduction

• add new module under a pnpm monorepo (with eslint being a dependency in other workspace packages)
• start the dev server with the vite-plugin-checker plugin added

Expected behavior

The plugin should only typecheck source folder contents

System Info

System:
    OS: Linux 5.4 Ubuntu 20.04.3 LTS (Focal Fossa)
    CPU: (2) x64 DO-Regular
    Memory: 482.94 MB / 3.84 GB
    Container: Yes
    Shell: 5.8 - /usr/bin/zsh
  Binaries:
    Node: 14.17.0 - ~/.nvm/versions/node/v14.17.0/bin/node
    Yarn: 1.22.17 - ~/.nvm/versions/node/v14.17.0/bin/yarn
    npm: 6.14.13 - ~/.nvm/versions/node/v14.17.0/bin/npm
  npmPackages:
    vite-plugin-checker: ^0.4.4 => 0.4.4

Additional context

No response

Validations

• Read the docs.
• Check that there isn’t already an issue that reports the same bug to avoid creating a duplicate.

[val1984]

Sorry, I wasn’t clear in my previous message but it definitely fixed the issue for me.

@smtrd3 Can you try this solution?

[TurtIeSocks]

I’m kind of experiencing this as well, though it’s more of a bonus than a bug for me. If I run tsc --noEmit the errors that are being reported by the plugin are indeed picked up by TypeScript, but these errors aren’t reported in the IDE (VS Code). I know Vite doesn’t really care, but they’re of course not reported during the vite build process as well, meaning I probably never would have caught these if I wasn’t using the plugin. (❤️)

Is this a TypeScript bug, a VS Code bug or? Any hints on how I can make sure that these bugs are reported in the IDE as well?