brew安装特定版本flow，解决问题！

在atom+react-native项目中安装了nuclide。然而使用flow的时候出现了问题。

$ brew -v
Homebrew 1.2.0
 
$ flow version
Flow, a static type checker for JavaScript, version 0.45.0
 
$ flow
Launching Flow server for /Users/real/Desktop/reactPro/pro2
Wrong version of Flow. The config specifies version ^0.42.0 but this is version 0.45.0

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在我的.flowconfig文件中最后的地方也可以看到：

[version]
^0.42.0

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这意味着flow的版本应该是>=0.42.0 <0.43.0，所以0.45.0是不合适的。这就需要下载0.42.0的版本。

搜索了网上一些说法(brew 安装特定版本)：

• brew install flow（安装的是最新版本）
• brew versions (已经废弃了)
• brew tap homebrew/versions（已经废弃了）

Warning: homebrew/versions was deprecated. This tap is now empty as all its formulae were migrated.

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• npm install flow-bin@0.42.0 -g （可以安装，但是没看到实际效果）

在我安装flow的过程中有这样的提示：

$ brew install flow
==> Downloading https://homebrew.bintray.com/bottles/flow-0.45.0.sierra.bottle.tar.gz
Already downloaded: /Users/real/Library/Caches/Homebrew/flow-0.45.0.sierra.bottle.tar.gz
==> Pouring flow-0.45.0.sierra.bottle.tar.gz
==> Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d
 
zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> Summary
��  /usr/local/Cellar/flow/0.45.0: 8 files, 6.4MB

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它下载的是0.45.0的版本，而我需要的是0.42.0的版本，于是我手动下载了。

https://homebrew.bintray.com/bottles/flow-0.42.0.sierra.bottle.tar.gz

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然后将解压后的文件放到

/usr/local/Cellar/flow/

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这样就安装了0.42.0的版本。然后通过

$ brew switch flow 0.42.0

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就可以了。。一番心酸。。老哥们赞一赞。。