import statments inside <script> tag is failed to be resolved when re-building by watch mode

[nandin-borjigin]

Expected behavior

import statments inside the SFC <script> area should be correctly resolved during a rollup rebuild triggered by the rollup-watch

Actual behavior

import statments inside SFC <script> area is failed to be resolved.

Steps to reproduce the behavior

1. use the cookbook/minimal example as the base.
2. add any valid import statement in the <script> area of MyComponent.vue
   let's say that the package imported is called my-package and assume that it is correctly installed inside node_modules.
3. run npx rollup -c -w
4. it succeeds
5. make any trivial but valid chagnes to the MyComponent.vue and SAVE it
6. rollup rebuilds the example but fails with Error: Could not load my-package (imported by /path/to/the/example/MyComponent.vue?rollup-plugin-vue=script.js): ENOENT: no such file or directory, open 'my-package'

[znck]

It seems this problem is existing with rollup itself. rollup/rollup#982

Though, I'm trying to find the root cause.

[znck]

Closing in favour of similar issue #238