Configure Flow in JavaScript

Setup

Create package.json file

pnpm init -y

Install Babel and Flow bin

pnpm i -D @babel/{cli,core,preset-flow} flow-bin

Create .babelrc file

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

Generate .flowconfig file

pnpx flow init

Check flow error and status

pnpx flow status

Add compile on package.json

"scripts": {
    "build": "babel src/ -d lib/"
},

add @flow on Source file

main.js

// @flow

/**
 * Code
 */

RUN

pnpm build