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Announcing TypeScript 2.9 RC

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README.md
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[![Build Status](https://travis-ci.org/zhongsp/TypeScript.svg?branch=master)](https://travis-ci.org/zhongsp/TypeScript) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com)
<img src="./misc/ts_logo.jpg" alt="TypeScript" width="24px" height="24px" style="vertical-align: bottom;"> [TypeScript 2.8 (March 27, 2018)](https://blogs.msdn.microsoft.com/typescript/2018/03/27/announcing-typescript-2-8/)
<img src="./misc/ts_logo.jpg" alt="TypeScript" width="24px" height="24px" style="vertical-align: bottom;"> [TypeScript 2.9 RC (May 16, 2018)](https://blogs.msdn.microsoft.com/typescript/2018/05/16/announcing-typescript-2-9-rc/)
* 条件性类型（Conditional Types）
* 新增标记：仅输出声明文件
* @jsx编译注释
* JSX将使用工厂函数进行解析
* Map类型修饰符上的细粒度控制
* 重新组织导入语句
* 快速修复未初始化属性
* `keyof`和映射对象类型里支持symbol和数字字面量
* import()类型
TypeScript是JavaScript的超集并且能够编译输出为纯粹的JavaScript.

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# TypeScript Handbook（中文版）
<img src="./misc/ts_logo.jpg" alt="TypeScript" width="24px" height="24px" style="vertical-align: bottom;"> [TypeScript 2.8 (March 27, 2018)](https://blogs.msdn.microsoft.com/typescript/2018/03/27/announcing-typescript-2-8/)
<img src="./misc/ts_logo.jpg" alt="TypeScript" width="24px" height="24px" style="vertical-align: bottom;"> [TypeScript 2.9 RC (May 16, 2018)](https://blogs.msdn.microsoft.com/typescript/2018/05/16/announcing-typescript-2-9-rc/)
> 从前打心眼儿里讨厌编译成JavaScript的这类语言，像Coffee，Dart等。
> 但是在15年春节前后却爱上了TypeScript。