Steps to reproduce:

1. Git clone this repo.
2. Try to run a sample, with command: $env:ELEVENTY_EXPERIMENTAL="true";npx @11ty/eleventy --input=test/sample --serve (the one in package json won't work on windows).
3. I get an eror:
   > You must supply options.input to rollup Error was thrown: Error: You must supply options.input to rollup at Graph.generateModuleGraph (C:\Users\Domas\Desktop\eleventy-plugin-vue\node_modules\rollup\dist\shared\rollup.js:19096:19) at processTicksAndRejections (internal/process/task_queues.js:93:5) at async Graph.build (C:\Users\Domas\Desktop\eleventy-plugin-vue\node_modules\rollup\dist\shared\rollup.js:19060:9) at async rollupInternal (C:\Users\Domas\Desktop\eleventy-plugin-vue\node_modules\rollup\dist\shared\rollup.js:19980:9) at async EleventyVue.getBundle (C:\Users\Domas\Desktop\eleventy-plugin-vue\EleventyVue.js:124:18) at async Object.init (C:\Users\Domas\Desktop\eleventy-plugin-vue\.eleventy.js:99:22)