Flow works best when installed per-project with explicit versioning rather than globally.
Luckily, if you’re already familiar with npm or yarn, this process should be pretty familiar!
Add a devDependency on the flow-bin npm package:
yarn add --dev flow-bin
//
npm install --save-dev flow-bin
yarn run flow
//
npm run flow
Running the command flow init will generate a .flowconfig file within the directory that be modified as needed.