Version

3.0.0-beta.12 and .beta.11

Steps to reproduce

Include { compiler: true } in the vue.config.js file (because I need run-time compiling!)
Try running "npm run serve"

What is expected?

That it works, like in 3.0.0-beta.10, and like in the documentation which says is valid: https://github.com/vuejs/vue-cli/blob/dev/docs/config.md

What is actually happening?

ERROR Invalid options in vue.config.js: "compiler" is not allowed

I assume it's been renamed, as "kittens: true" also fails. If so, the documentation needs updating