pushd pkg1 && yarn && yarn build && yarn link && popd
pushd app1 && yarn link pkg1 && yarn && yarn build && popd
code app1/dist/main.js
Comment Qux.displayName line in pkg1/src/Qux.js and Qux won't be included in app dist/main.js
To iterate quickly on changes:
pushd pkg1 && yarn build && popd && pushd app1 && yarn build && code dist/main.js && popd