fix: vite build warning

[Zamiell]

When we run "npm run build", it displays the following warning:

Entry module "src/index.ts" is using named and default exports together. Consumers of your bundle will have to use chunk.default to access the default export, which may not be what you want. Use output.exports: "named" to disable this warning.

This pull request fixes it.

[raineorshine]

Thank you!

This may be invalidated by #1649, which will be merged soon.