Typegen high CPU/Memory usage

[SeanLatimer]

I'm using React Router as a...

framework

Reproduction

1. Create project with pnpx create-react-router@latest
2. Run pnpm dev (CPU/Memory usage is fine)
3. Re-run pnpm dev, this time CPU/Memory usage will be increased.

System Info

System:
    OS: Windows 11 10.0.22631
    CPU: (16) x64 AMD Ryzen 7 5800X3D 8-Core Processor
    Memory: 15.02 GB / 31.93 GB
  Binaries:
    Node: 22.12.0 - ~\.proto\shims\node.EXE
    npm: 10.8.3 - ~\.proto\shims\npm.EXE
    pnpm: 9.15.0 - ~\.proto\shims\pnpm.EXE
    bun: 1.1.38 - ~\.proto\shims\bun.EXE
  Browsers:
    Edge: Chromium (127.0.2651.74)
    Internet Explorer: 11.0.22621.3527
  npmPackages:
    @react-router/dev: ^7.1.1 => 7.1.1
    @react-router/node: ^7.1.1 => 7.1.1
    @react-router/serve: ^7.1.1 => 7.1.1
    react-router: ^7.1.1 => 7.1.1
    vite: ^5.4.11 => 5.4.11

Used Package Manager

pnpm

Expected Behavior

CPU/Memory usage would remain the consistent between multiple sessions of running 'dev'.

Actual Behavior

On initial run, after creating the project, CPU/Memory usage is as I would expect. Subsequent runs, this increases (in my case 20%+ CPU usage + what appears to be leaking memory).

The issue only presents itself when .react-router exists when running dev, deleting the folder resolves the issue until the next run of dev. I took 2 CPU profiles, one of the initial run and another of the subsequent run, which seems to point to a file watcher.

react-router-0.cpuprofile
react-router-1.cpuprofile

[SeanLatimer]

I've uncovered that the issue only happens on Node v22.12 and greater, so a temporary workaround for now would be to downgrade to v22.11.