ESLint config being generated when ESLint is not installed

[aklinker1]

Describe the bug

When running wxt prepare, ESLint config is generated even when eslint isn't installed.

Reproduction

https://github.com/aklinker1/github-better-line-counts/tree/2660c4f1f7c47a1e2ace8d410e76931082507986

Steps to reproduce

bun i

And .wxt/eslintrc-auto-import.json will be created.

System Info

System:
    OS: macOS 14.2.1
    CPU: (8) arm64 Apple M1 Pro
    Memory: 4.91 GB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.20.3 - ~/.asdf/installs/nodejs/18.20.3/bin/node
    npm: 10.7.0 - ~/.asdf/plugins/nodejs/shims/npm
    bun: 1.1.31 - ~/.bunv/bin/bun
  Browsers:
    Chrome: 129.0.6668.101
    Safari: 17.2.1
  npmPackages:
    wxt: ^0.19.11 => 0.19.11

Used Package Manager

bun

Validations

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

[aklinker1]

This probably just needs to be changed to undefined instead of defaulting to 8. Should probably return undefined from getEslintVersion in this case as well, instead of an empty tuple.

https://github.com/wxt-dev/wxt/blob/b14c9107fe8a44d273912b9d349c9aadeb5f12a6/packages/wxt/src/core/resolve-config.ts#L388-L389