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Type-safe TODO list app in TypeScript + React + Redux

A Type-safe TODO list application written in TypeScript following by the wonderful lessons of egghead.io.

Awesome egghead.io Redux lessons!

This repository is TypeScript version of the lessons bellow.

https://egghead.io/courses/getting-started-with-redux

Demo page

https://nwtgck.github.io/egghead-todo-typescript-react/build/

How to run

$ cd <this-repo>
$ npm install
$ npm start

Then, go to http://localhost:8080.

How to build .html file and bundle.js

$ cd <this-repo>
$ npm install
$ npm run build

Then, you can open ./build/index.html by your browser.

Main technologies

  • TypeScript
  • React
  • Redux
  • webpack

Type safety

Filter, for example, is seems to be just string. But only 'SHOW_ALL', 'SHOW_ACTIVE' and 'SHOW_COMPLETED'' are acceptable as Filter because Filter type is defined bellow.

type Filter = 'SHOW_ALL' | 'SHOW_ACTIVE' | 'SHOW_COMPLETED';

Because of this feature, we can use string more relax without considering typo.

.tsx bellow is valid.

<FilterLink filter={'SHOW_ALL'}>All</FilterLink>

But, the mistake bellow will be detected at compile time. Good!

<FilterLink filter={'SHO_ALL'}>All</FilterLink>

This is only just one example. Almost things are typed, and some human errors can be detected at compile time.