[WIP]typescript get started

interface Name {
    prop1: type1;
    prop2: type2;
    ...
}

 ● apply

: TypeName

 ● with class

interface SampleInterface {}
Class SampleClass {}
let a: SampleInterface = new SampleClass(...);

● annotate parameters and return values to functions

function name(p1: Type1, p2: Type2, ....): RType {}

type MyBool = true | false;
type WindowStates = "open" | "closed" | "minimized";
type LockStates = "locked" | "unlocked";
type PositiveOddNumbersUnderTen = 1 | 3 | 5 | 7 | 9;

function getLength(obj: string | string[]) {
  return obj.length;
}

type StringArray = Array;
type NumberArray = Array;
type ObjectWithNameArray = Array<{ name: string }>;

interface Backpack {
  add: (obj: Type) => void;
  get: () => Type;
}