TypeScript 4.0 New Features
$ npm install typescript@beta
https://devblogs.microsoft.com/typescript/announcing-typescript-4-0-beta/
Variadic Tuple Types
可变参数元组类型
Labeled Tuple Elements
标记的元组元素
Class Property Inference from Constructors
构造函数的类属性推断
Short-Circuiting Assignment Operators
短路赋值运算符
let values: string[];
// Before
(values ?? (values = [])).push("hello");
// After
(values ??= []).push("hello");
a ||= b;
// actually equivalent to
a || (a = b);
unknown on catch Clause Bindings
捕获子句绑定未知
Custom JSX Factories
自定义 JSX 工厂
Speed Improvements in build mode with --noEmitOnError
改善了 --noEmitOnError 构建模式下的速度
--incremental with --noEmit
--incremental 和 --noEmit
Editor Improvements
编辑器改进
/** @deprecated */ Support
Partial Editing Mode at Startup
启动时的部分编辑模式
Smarter Auto-Imports
更智能的自动导入
Breaking Changes
重大变化
lib.d.ts Changes
lib.d.ts 的变化
Properties Overridding Accessors (and vice versa) is an Error
属性覆盖访问器(反之亦然)是错误
Operands for delete must be optional
删除操作数必须是可选的
Usage of TypeScript’s Node Factory is Deprecated
使用 TypeScript 的 Node Factory 已弃用
refs
https://www.typescriptlang.org/zh/
https://www.typescriptlang.org/play
the new typescript website
https://devblogs.microsoft.com/typescript/announcing-the-new-typescript-website/
Fluent Design
https://www.microsoft.com/design/fluent/
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