`assetsInclude=[]` in vite config causes extra file generation and path complications

[colearendt]

Describe the bug

Using vite-plugin-web-extension to create a web extension, I happened upon very strange behavior. Namely,

• files would sometimes be produced at incorrect paths (i.e. if src/popup/popup.html, then output at dist/popup.html
• some files would get content like export default "/popup.html"
• error messages like:

Generated an empty chunk: "popup/popup"
"popup.html" overwrites a previously emitted file of the same name

The fix for this behavior was to remove the following line from my vite.config.ts (which was there as a placeholder):

assetsInclude: []

Reproduction

https://github.com/colearendt/extensions-example

Steps to reproduce

• npm run build
• notice there is a dist/popup.html file with contents: export default "/popup.html"%
• remove the assetsInclude: [] line from vite.config.ts
• Build and notice dist/popup.html has expected contents

System Info

System:
    OS: macOS 12.2.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 91.50 MB / 32.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.15.1 - ~/.nvm/versions/node/v16.15.1/bin/node
    Yarn: 1.22.18 - /opt/homebrew/bin/yarn
    npm: 8.11.0 - ~/.nvm/versions/node/v16.15.1/bin/npm
  Browsers:
    Brave Browser: 104.1.42.88
    Chrome: 107.0.5304.110
    Firefox: 106.0.5
    Safari: 15.3
  npmPackages:
    @vitejs/plugin-vue: ^3.2.0 => 3.2.0 
    vite: ^3.2.3 => 3.2.3

Used Package Manager

npm

Logs

 npm run build

> extension-example@0.0.0 build
> vue-tsc && vite build

vite v3.2.3 building for production...

[vite-plugin-web-extension] 
  Building HTML Pages in Multi-Page Mode:
    • src/popup.html
  Building in Lib Mode:
    • (none)

[vite-plugin-web-extension] Building HTML Pages in Multi-Page Mode
✓ 1 modules transformed.
Generated an empty chunk: "popup"
rendering chunks (1)...The emitted file "popup.html" overwrites a previously emitted file of the same name.
../dist/assets/vue.svg   0.48 KiB
../dist/manifest.json    0.28 KiB
../dist/popup.html       0.03 KiB

Validations

• Follow our Code of Conduct
• 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.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• 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.

[bluwy]

Looks like it's because the empty array is passed to here as-is:

vite/packages/vite/src/node/config.ts

Lines 534 to 536 in 6462ab0

	const assetsFilter = config.assetsInclude
	? createFilter(config.assetsInclude)
	: () => false

which equals to () => true, which probably isn't what the most people expect. This code should instead check that the array has at least one children before using createFilter.

[github-actions]

Hello @colearendt. We like your proposal/feedback and would appreciate a contribution via a Pull Request by you or another community member. We thank you in advance for your contribution and are looking forward to reviewing it!