[Bug?]: TypeError in lazyRoute.js with Vite 8 (Dev Mode) #2154

Duplicates

• I have searched the existing issues

Latest version

• I have tested the latest version

Current behavior 😯

When running a SolidStart app with Vite 8 in dev mode (npm run dev), the app crashes immediately when loading any lazy-loaded route.
The terminal shows a TypeError in lazyRoute.js because manifest.inputs[component.src].import() returns undefined and .catch() is called on it.

Expected behavior 🤔

Lazy-loaded routes should resolve correctly in dev mode.
The SSR manifest should provide a valid Promise from router.internals.devServer.ssrLoadModule, allowing routes to load without crashing.

Steps to reproduce 🕹

1. Create a new SolidStart project with @solidjs/start@1.3.2 and vite@8.0.14.
2. Run npm install.
3. Run npm run dev.
4. Open http://localhost:3000 in the browser.
5. Observe the crash in terminal and 500 error in browser.

Context 🔦

I am trying to develop a SolidStart application locally on Windows 11 with Vite 8.
This bug blocks all local development in dev mode, making it impossible to test lazy routes.
In production (npm run build) the app works, but development workflow is broken until patched.
You can see in https://github.com/moonhuntercode/solidstart-vite8-bug-repro public repo with more details😁

Your environment 🌎

System:
  OS: Windows 11
  CPU: Intel i7
Binaries:
  Node: 24.14.1
  npm: 10.8.2
npmPackages:
  @solidjs/start: 1.3.2
  vite: 8.0.14
  vite-plugin-solid: 2.11.12
  @solidjs/router: 0.16.1