test-flowtype-vs-typescript

📒 Test project, which shows major differences between: FlowType and TypeScript

Why?

A couple of days ago, I read comments in a blog post http://michalzalecki.com/typescript-vs-flow/ and decided to run tests to show the major differences between FlowType and TypeScript.

Source

1. FlowType source file.

   /* @flow */
   
   'use strict';
   
   function Person(name: string) {
       this.name = name;
   }
   
   module.exports = Person;

2. TypeScript source file

   'use strict';
   
   class Person {
       private name: string;
   
       constructor(name: string) {
           this.name = name;
       }
   }
   
   export default Person;

3. After compilation when I run the line

   new Person(123);

• in the FlowType strategy I got an error ⛔

  Hello BDD! Runtime error occur! 😎

• following the TypeScript way nothing happens ...

  Eh... no runtime errors? Why? 😱

How to run?

npm run build   # build basic scaffold
npm test        # trigger unit tests!

Conclusions

FlowType was created to keep proper type during runtime (life application)

TypeScript was created to keep proper type during translation process.

License

The MIT License @ 2016