Error when bundling with esbuild using custom unplugin

[BoYuanSu]

Environment

node: 20
unplugin: 2.3.5

Reproduction

https://github.com/BoYuanSu/unplugin-unused-components/tree/fix/esbuild-test

1. install deps, pnpm i.

2. change directory to esbuild-plugin-test cd ./tests/esbuild-plugin-test/.

3. run test script pnpm run test.

Describe the bug

I'm developing a custom plugin based on unplugin, designed to scan my project for components and report unused ones. It works as expected in vite and webpack, but when I try to test it with esbuild, I encounter the following error:

stdout | esbuild.test.ts > esbuild > should run esbuild tests
Found 2 unused components:
- /Users/user/Desktop/boyuansu/unplugin-unused-components/tests/fixtures/TestUnused.vue
- /Users/user/Desktop/boyuansu/unplugin-unused-components/tests/fixtures/TestUnusedReact.jsx

 ❯ esbuild.test.ts (1 test | 1 failed) 60ms
   × esbuild > should run esbuild tests 59ms
     → Build failed with 2 errors:
../fixtures/TestUsed.vue:1:0: ERROR: The JSX syntax extension is not currently enabled
../fixtures/TestUsed.vue:4:10: ERROR: Expected "}" but found "{"

I've tried to remove my custom plugin and the fixtures setup work fine with esbuild config.
Is there anything specific I need to do to support esbuild with unplugin?
Any known caveats or extra config I might be missing?

Thanks!

Additional context

No response

Logs