$ 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
在我的.flowconfig文件中最后的地方也可以看到：
[version] ^0.42.0
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.
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
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
然后将解压后的文件放到
/usr/local/Cellar/flow/
这样就安装了0.42.0的版本。然后通过
$ brew switch flow 0.42.0
就可以了。一番心酸。老哥们赞一赞。
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