How to share flow types?

See: http://stackoverflow.com/questions/42911949/how-to-share-the-same-type-definition-in-two-files

To reproduce issue run:

yarn
yarn run flow

Problem

Flow returns this as the output:

src/file_a.js:3
  3: const randomVariable: MySharedType = {thing: true};
                           ^^^^^^^^^^^^ identifier `MySharedType`. Could not resolve name

src/file_b.js:3
  3: const anotherRandomVariable : MySharedType = {thing: true};
                                   ^^^^^^^^^^^^ identifier `MySharedType`. Could not resolve name

How do I get flow to allow me to use the MySharedType inside the /flow/typeExtensions directory?

Solution

Flow doesn't recognize changes to shared [libs] files. So to fix this you simply need to restart the flow server:

./node_modules/.bin/flow stop
./node_modules/.bin/flow start