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How to Set Up Flow for React

Educative Answers Team

Setup

You set up Flow for React the same way you set up Babel.

First, run the following script to install @babel/core, @babel/cli, and @babel/preset-flow:

npm install --save-dev @babel/core @babel/cli @babel/preset-flow

Next, a .babelrc file needs to be created at the root of the project. In the presets, @babel/preset-flow needs to be added as such:

{
  "presets": ["@babel/preset-flow"]
}

To compile all the files from one folder to another, use:

./node_modules/.bin/babel <SOURCE FOLDER> -d <TARGET FOLDER>

Here, the <SOURCE FOLDER> is the directory of the folder where all the files are stored before compiling, and the <TARGET FOLDER> is the directory where all the compiled files are to be moved.

Configuration file

The next step would be to write a .flowconfig file. This file contains all of the rules and configuration for Flow. It consists of 7 sections:

  1. [include] tells Flow which files to include to check for changes and errors.
  2. [ignore] tells Flow which files to ignore when checking for changes and errors.
  3. [untyped] tells Flow which files to throw away and not check, and treat modules as any.
  4. [libs] tells Flow which libraries to include when checking.
  5. **[lints] tells Flow how to behave with different kinds of Lints, programming, or syntactic errors.
  6. [options] contains a set of configurable rules from Flow’s options that tell it how to perform its checks.
  7. [version] tells Flow its version requirements in the project.

RELATED TAGS

javascript
react
flow
error checking
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