In files like https://github.com/vuejs/vue/blob/dev/flow/component.js there's a lot of uses of any, Object, and Function.

I'm currently improving the documentation around this in Flow, because we don't do a good enough job of explaining it right now. Sorry about that.

These types aren't actually type-safe. They are there for convenience purposes.

• Instead of any you should use mixed (or a more specific type).
• Instead of Function you should use (type, type) => type
• Instead of Object you should use { prop: type } or { [key: type]: type } (for maps)

This will drastically improve user's experience with Vue using Flow.