Uncaught ReferenceError: useEffect is not defined

Describe the bug

I noticed an issue. When I set vite build.target to esnext, the auto-import feature stops working.

https://github.com/user-attachments/assets/64a73876-4122-426f-a2d7-58e8a60289ff

Reproduction

https://github.com/rxliuli/wxt-esnext-error-demo

Steps to reproduce

No response

System Info

System:
    OS: macOS 15.5
    CPU: (12) arm64 Apple M2 Max
    Memory: 15.30 GB / 64.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.14.0 - /usr/local/bin/node
    npm: 10.9.2 - /usr/local/bin/npm
    pnpm: 10.5.2 - /usr/local/bin/pnpm
    bun: 1.1.6 - ~/.bun/bin/bun
  Browsers:
    Brave Browser: 131.1.73.105
    Chrome: 137.0.7151.69
    Edge: 128.0.2739.54
    Safari: 18.5
  npmPackages:
    wxt: ^0.20.6 => 0.20.7

Used Package Manager

pnpm

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

Run the linked wxt-esnext-error-demo reproduction with Vite build.target set to esnext and inspect the generated output around the missing useEffect reference. Compare the auto-import behavior with a non-esnext target and verify that the reproduction no longer produces the uncaught ReferenceError.