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

This repository is TypeScript version of the lessons bellow.

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

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

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

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

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

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

• TypeScript
• React
• Redux
• webpack

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.