如何查看typescript版本，安装指定typescript版本，卸载typescript

WARNING: You are currently running a version of TypeScript which is not officially supported by typescript-estree.

You may find that it works just fine, or you may not.

SUPPORTED TYPESCRIPT VERSIONS: >=3.2.1 <3.6.0

YOUR TYPESCRIPT VERSION: 3.9.10

首先卸载typescript

npm uninstall -g typescript

然后安装指定版本typescript

# npm install -g typescript@3.4.3
npm intsall -g typescript@版本号

查看安装的版本

tsc -v

安装最新版本

npm install -g typescript```