Lazy loaded React-Router reports sourcemap issue

[swernerx]

Describe the bug

We are using generouted to build a routing setup (for react-router) based on file system layout (NextJS inspired). Interestingly, the whole setup using import.meta leads to a lazy loading of react-router. I am not sure why, as the RouterProvider is part of the initial import sequence.

The initial log files looks like:

VITE v3.2.5  ready in 248 ms

  ➜  Local:   http://127.0.0.1:5173/
  ➜  Network: use --host to expose
Sourcemap for "/Users/sebastian/Workspace/vite-react-router-bug/node_modules/.pnpm/react-router-dom@6.4.4_biqbaboplfbrettd7655fr4n2y/node_modules/react-router-dom/dist/index.js" points to missing source files
Sourcemap for "/Users/sebastian/Workspace/vite-react-router-bug/node_modules/.pnpm/react-router@6.4.4_react@18.2.0/node_modules/react-router/dist/index.js" points to missing source files
10:15:45 [vite] ✨ new dependencies optimized: react-router-dom
10:15:45 [vite] ✨ optimized dependencies changed. reloading

This all happens on directly on the start of the server and leads to some unwanted side-effects (in our larger app) as it seems. When restarting the dev-server the warning is gone and the application works fine.

This is the relevant import-related code in generouted

We have also tried the following to work-around the issue:

import { Link } from 'react-router-dom';
Link;

This added to the root-level App.tsx fixes the issue. No warning. No application bug.

Reproduction

https://github.com/swernerx/vite-react-router-bug

Steps to reproduce

• pnpm install
• npm run dev

System Info

System:
    OS: macOS 13.0.1
    CPU: (20) arm64 Apple M1 Ultra
    Memory: 1.02 GB / 64.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 16.18.0 - /opt/homebrew/opt/node@16/bin/node
    Yarn: 1.22.19 - /opt/homebrew/opt/node@16/bin/yarn
    npm: 8.19.2 - /opt/homebrew/opt/node@16/bin/npm
  Browsers:
    Chrome: 108.0.5359.94
    Firefox: 106.0.5
    Safari: 16.1
  npmPackages:
    @vitejs/plugin-react: ^2.2.0 => 2.2.0
    vite: ^3.2.3 => 3.2.5

Used Package Manager

pnpm

Logs

No response

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[swernerx]

Same issue with 4.0.0-beta.2: