When using webpack hook in appDir mode, got ReferenceError: Cannot access 'watcher' before initialization error.
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- JavaScript
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Description
Verify canary release
- I verified that the issue exists in the latest Next.js canary release
Provide environment information
Operating System:
Platform: darwin
Arch: arm64
Version: Darwin Kernel Version 22.1.0: Sun Oct 9 20:15:09 PDT 2022; root:xnu-8792.41.9~2/RELEASE_ARM64_T6000
Binaries:
Node: 16.18.0
npm: 8.19.2
Yarn: 1.22.19
pnpm: 8.2.0
Relevant packages:
next: 13.3.1
eslint-config-next: N/A
react: 18.2.0
react-dom: 18.2.0
Which area(s) of Next.js are affected? (leave empty if unsure)
App directory (appDir: true), CLI (create-next-app)
Link to the code that reproduces this issue
https://github.com/Innei/next-watcher-reproduction
To Reproduce
Install dependencies and run next dev.
Describe the Bug
Start dev crash, got ReferenceError: Cannot access 'watcher' before initialization
Expected Behavior
No crash
Which browser are you using? (if relevant)
No response
How are you deploying your application? (if relevant)
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Use the linked next-watcher-reproduction repository; install dependencies and run next dev to confirm the crash with appDir mode and a webpack hook. Trace the appDir webpack-hook startup path from the reported ReferenceError, and consider the issue done when next dev starts without the watcher initialization crash.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, nextjs, webpack
- Domain
- build-system
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 40/100