npm中相关的安装问题

问题及解决方案：

一、
问题：

Installation Problem: bash: yarn: command not found

解决方案：

npm install -g yarn

参考：

1. Installation Problem: bash: yarn: command not found #601
2. Yarn does not work in Git Bash on Windows #5349
3. Git Bash Command on Windows, yarn command not found

二、
问题：

Building for production...Browserslist: caniuse-lite is outdated. Please run next command `npm update caniuse-lite browserslist`

解决方案：
暂无。

三、
问题：

npm WARN … requires a peer of … but none is installed. 
You must install peer dependencies yourself.

解决方案：

一、Deprecated Solution:

1. You can use npm-install-peers to find and install required peer dependencies.

$ npm install -g npm-install-peers

$ npm-install-peers

2. If you are getting this error after updating any package's version then remove node_modules directory and reinstall packages by npm install or npm cache clean and npm install.

二、Updated Solution:

Use following for each peer dependency to install that and remove the error

$ npm install --save-dev xxxxx

参考：

1. Browserslist: caniuse-lite is outdated
2. caniuse-lite is outdated.
3. npm WARN … requires a peer of … but none is installed. You must install peer dependencies yourself