https://blogs.msdn.microsoft.com/typescript/2018/01/31/announcing-typescript-2-7/
ํฅ๋ฏธ๋ก์ด ๋ณ๊ฒฝ์ด ๋ง๋ค์.
์๋ฐ์คํฌ๋ฆฝํธ ๊ฐ๋ฐ์ ํฌ๋ผ