[Turbopack]: Critical useInsertionEffect TypeError, possibly related to earlier bug in stable Area #84784
Description
Link to the code that reproduces this issue
https://codesandbox.io/p/devbox/divine-worker-fcjfpt
To Reproduce
- Open the provided CodeSandbox link.
- Ensure the Next.js version is set to
16.0.0-canary.1or later. - Run the development server.
- Load the application preview.
- Observe the fatal
useInsertionEffectTypeError in the browser console.
Current vs. Expected behavior
Current Behavior
When running the development server with Turbopack (next dev --turbo), the application is highly unstable and exhibits multiple, distinct runtime errors. The exact error depends on the Next.js version and the application state.
1. On Next.js 16.0.0-canary.1 (in CodeSandbox):
Two separate errors are observed:
-
On Initial Load: The application crashes immediately with a fatal
Runtime TypeError. This prevents the component from rendering at all.Error: Cannot read properties of null (reading 'useInsertionEffect') -
During HMR / Subsequent Renders: A second error related to Hot Module Replacement appears, indicating that Turbopack has lost track of critical modules.
Runtime Error: Module [next]/entry/page-loader.ts ... was instantiated ... but the module factory is not available. It might have been deleted in an HMR update.
2. On Next.js 15.5.4 (stable, original environment):
The application crashes when a specific component renders, throwing a different Runtime TypeError.
Runtime TypeError: (...).call is not a function
This collection of errors demonstrates significant instability in Turbopack. The application works perfectly with the default Webpack bundler (next dev) in all scenarios.
Expected Behavior
The application should load and run without any runtime errors when using the Turbopack development server (next dev --turbo). Its behavior and stability should be consistent with the Webpack development server. HMR updates should apply successfully without causing the module factory to become unavailable.
Provide environment information
Operating System:
Platform: darwin
Arch: arm64
Version: Darwin Kernel Version 25.0.0: Mon Aug 25 21:17:45 PDT 2025; root:xnu-12377.1.9~3/RELEASE_ARM64_T8103
Available memory (MB): 8192
Available CPU cores: 8
Binaries:
Node: 24.1.0
npm: 11.3.0
Yarn: N/A
pnpm: 10.14.0
Relevant Packages:
next: 15.5.4 // Latest available version is detected (15.5.4).
eslint-config-next: 15.5.4
react: 19.1.0
react-dom: 19.1.0
typescript: 5.9.3
Next.js Config:
output: N/AWhich area(s) are affected? (Select all that apply)
Turbopack
Which stage(s) are affected? (Select all that apply)
next dev (local)
Additional context
No response