在安装babel到 v7.0.0之后，使用babel命令偶尔会出现如下错误：

Error: Requires Babel "^7.0.0-0", but was loaded with "6.26.3". If you are sure you have a compatible version of @babel/core, it is likely that something in your build process is loading the wrong version. Inspect the stack trace of this error to look for the first entry that doesn't mention "@babel/core" or "babel-core" to see what is calling Babel.

原因自然是因为babel核心和babel配置版本不匹配造成的。

而我自己因为以前全局安装过babel6，从而导致这个错误。

因此我先是全局卸载babel6，然后根据官网，更新babel核心 @babel/core @babel/cli 到 @^7.0.0 ，其余插件按需安装。

以下为搜索解决方案时查到的其余解决办法：

如果有其他插件强制使用了babel6，那么更新核心之后可能仍然无法解决问题，此时可以安装 babel-core@^7.0.0-bridge.0 解决。

npm i babel-core@7.0.0-bridge.0 -D

使用这种方法就不一定需要更新 @babel/cli 了

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