Boolean
Number
String
Array
Tuple 元组类型
Enum
Any
Void
Null and Undefined
Never
Type assertions 类型申明
A note about let
You may’ve noticed that so far, we’ve been using theletkeyword instead of JavaScript’svarkeyword which you might be more familiar with. Theletkeyword is actually a newer JavaScript construct that TypeScript makes available. We’ll discuss the details later, but many common problems in JavaScript are alleviated by usinglet, so you should use it instead ofvarwhenever possible.
