Typescripts

1. Namespace

1.1. namespace Foo { }

2. Interface

2.1. interface Foo { }

3. Enum

3.1. enum Color { Red }

4. Quotes

4.1. Prefer single quotes (') unless escaping

5. Array

5.1. foos:Foo[]

5.2. foos:Array<Foo>

6. Variable and Function

6.1. var fooVar; function barFunc() { }

7. Class

7.1. class Foo { }

8. Null vs Undefined

8.1. let foo = {x:123,y:undefined};

8.2. let foo:{x:number,y?:number} = {x:123};

8.3. return null;

8.4. return undefined;

8.5. if (error === null)

8.6. if (error)

8.7. if (error !== null)

8.8. if (error != undefined)

9. Spaces

9.1. Use 2 spaces. Not tabs.

10. Filename

10.1. camelCase. E.g. accordian.tsx, myControl.tsx, utils.ts, map.ts etc.