Integrating Flow

Issue

Description

Flow is a static type checker for your JavaScript code. It does a lot of work to make us more productive. Making us code faster, smarter, more confidently, and to a bigger scale.

Create React App already supports Flow by default. All we need to do is install Flow and create a .flowconfig file by running flow init.

yarn add --dev flow-bin
yarn run flow init

Flow will be run as part of create-react-app’s scripts.

Also, Flow and Babel are designed to work great together. It takes just a few steps to set them up together.

yarn add --dev babel-preset-flow
# or
npm install --save-dev babel-preset-flow

Then add flow to your Babel presets config.

{
  "presets": ["flow"]
}

[arthurbuhl]

Ok, seems like we don’t need flow here. Should I close this issue @emmawedekind @crysfel?

[charlesjliu]

I don’t think we wanted to introduce type checking to keep the barrier to entry for other contributors low.

That said, if we do want to add type checking … typescript >>> flow all day 🙃