- https://ts.xcatliu.com/basics/primitive-data-types.html
- https://www.tslang.cn/docs/handbook/tsconfig-json.html
- https://www.cnblogs.com/pingan8787/p/13069339.html
npm install -g typescript
tsc helloworld.ts
tsc -w
npm install -g typescript
tsc helloworld.ts
tsc -w