build breaks with 5.0.0-beta.2

Issue description

• reactstrap version #5.0.0-beta.2
• import method es
• react version #16.2.0
• bootstrap version #4.0.0

What is happening?

when building with gulp + browserify this happens:

/Users/matteo/dev/my-project/node_modules/react-popper/lib/react-popper.js:1
export { default as Manager } from './Manager';
^
ParseError: 'import' and 'export' may appear only with 'sourceType: module'

• If I install 5.0.0-beta everything is fine
• If I install 5.0.0-beta.2 the build breaks
• If I manually install react-popper 0.8.2 and delete 0.8.1 everything is fine again

the strange thing is that react-popper was updated from 0.8.1 to 0.8.2 to “fix: build” (see https://github.com/souporserious/react-popper/commit/0d97929b038b1bba69f920772505f8d6af158f3f), while reactstrap’s commit b515e6b says “chore(build): downgrade react-popper to fix build”

[mpolinowski]

Similar issue with a Gatsby SSR starter using reactstrap - updating to 0.8.2 solved it.

[TheSharpieOne]

The fix build was supposed to downgrade the version in the yarn lock, I didn’t notice it was bumped in the package.json… Yay two package systems! …