Type คือข้อมูลชนิดหนึ่ง

ประเภทของ Type

1. Primitive types

   type MyNumber = number;
   type MyString = string;
   type MyBoolean = boolean;
   type MySymbol = symbol;
   type MyBigInt = bigint;
   type MyUndefined = undefined;
   type MyNull = null;

2. Literal types

   Literal types คือ Type ที่มีค่านั้น เพียงค่าเดียว

   type MyNumberLiteral = 20;
   type MyStringLiteral = 'Hello';
   type MyBooleanLiteral = true;

3. Data structures (Object Types)

   type MyObject = {
   key1: boolean;
   key2: number;
   };
   type MyRecord = {
   [key: string]: number;
   };
   type MyTuple = [boolean, number];
   type MyArray = number[];

4. Unions

   type MyUnion = 'Yes' | 'No';
   // Example
   const myUnion1: MyUnion = 'Yes';
   const myUnion2: MyUnion = 'No';
   const myUnion3: MyUnion = 'Maybe'; // Error

5. Intersections

   type MyIntersection = { count: number } & { title: string };
   // Example
   const myIntersection1: MyIntersection = {
   count: 1,
   title: 'Hello',
   };

อ้างอิง: https://type-level-typescript.com/types-are-just-data