Demonstrates a bug with Rollup.js when outputing multiple bundles
cd a
npm install
npm link
npm run build
cd ../b
npm install
npm link a
npm run build
b/lib/index.mjs and b/lib/index.bug.mjs should be identical as the only difference between rollup.config.js and rollup.bug.config.js is that the latter outputs multiple bundles.
b/lib/index.bug.mjs references a global external a even though it is imported.
Apparently this occurs only when using class.
rollup 0.34.10
node v6.2.1
npm 3.9.3