GitHub user imyzf opened a pull request:
https://github.com/apache/incubator-weex/pull/1307
* [jsfm] using rollup.watch to fix dev build
The `rollup-watch` package is deprecated and it will cause error:
```
$ npm run dev:jsfm
(node:40511) UnhandledPromiseRejectionWarning: TypeError: Cannotread
property 'map' of undefined
```

Using `rollup.watch` to fix this issue.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/imyzf/incubator-weex fix-dev-build
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-weex/pull/1307.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1307
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commit a5773d3833ce6de9f545eadc0f14903b328579c8
Author: Zhenfei You <hello@...>
Date: 2018-07-02T12:17:37Z
* [jsfm] using rollup.watch to fix dev build
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