[TypeScript] JS -> TS

JS -> TS 예시 ①

//javascript
function jsAdd(num1, num2) {
	return num1 + num2;
}

//typescript
function jsAdd(num1: number, num2: number): number {
	return num1 + num2;
}

JS -> TS 예시 ②

//javascript
function fetchNum(id) {
	// code 
  	// code
  	// code
  return new Promise((resolve, reject) => {
    resolve(100);
  });
}

//typescript
function fetchNum(id: string): Promise<number> {
	// code 
  	// code
  	// code
  return new Promise((resolve, reject) => {
    resolve(100);
  });
}