feat(babel-sugar-inject-h): setup method support

[u3u]

refer: vuejs/composition-api#64

[u3u]

@sodatea Do you have any thoughts?

[haoqunjiang]

I don't think this repository is the best place to provide this utility.
vue-function-api is an experimental plugin. Its API is still subject to change as the discussion of the RFC moves along. So I recommend you to ship a standalone babel plugin for setup support, and then point to that package in the vue-function-api repository for those who do need it.

[u3u]

Well, but can not get this in the setup method, so will cause an exception. Should I skip it?

[luwanquan]

I wrote a babel plugin to solve this problem, see babel-preset-vca-jsx.

[haoqunjiang]

As @vue/composition-api is preparing for a v1 release (vuejs/composition-api#390), I think now is a good time to have first-class support for this usage.

If anyone's interested, would you please open a new PR based on the latest version of @vue/composition-api?
I would love to do this myself but I haven't got the time, so any help is appreciated.

Cc: @antfu

[haoqunjiang]

Closing as #142 has been merged and released in v1.2.1.