---
search:
  exclude: true
changelog:
  category: Release
  version: 7.0.0
date: '2019-01-30T21:46:35Z'
seo:
  description: >-
    I decided to switch the project from Flow to TypeScript. This should ensure
    the TypeScript definitions match the actual implementation, without the need
    to…
title: TypeScript edition! 🎉
type: changelog
---
I decided to switch the project from Flow to TypeScript. This should ensure the TypeScript definitions match the actual implementation, without the need to manually sync the `index.d.ts`file.

In the process, i've rewritten some of the internals, but it shouldn't affect the actual API.

A documentation site has also been created using docz: https://react-intersection-observer.now.sh

## Breaking changes

* The deprecated `render` method has been removed - Make sure you use `children` instead.
* Instead of returning just `intersectionRatio`, you now get `entry` that contains the entire `IntersectionObserverEntry` element. If you're relying on `intersectionRatio`, you should change your code to `entry.intersectionRatio`.
* `rootId` has been removed - An idea for each unique root is now auto generated. This always felt like temporary solution, until i implemented a smarter way.
* Flow types have been removed.