Javascript 升级到 Babel 7：无法读取 null 的属性“绑定”
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Upgrade to Babel 7: Cannot read property 'bindings' of null
提问by rap-2-h
I just upgraded to Babel 7(from 6) by running these commands:
我刚刚通过运行以下命令升级到Babel 7（从 6）：
npm remove babel-cli
npm install --save-dev @babel/cli @babel/core @babel/preset-env
Here is my .babelrcfile:
这是我的.babelrc文件：
{ "presets": ["env"] }
Then I ran:
然后我跑了：
babel js/src --out-dir js/dist
And it results in:
结果是：
TypeError: Cannot read property 'bindings' of null
at Scope.moveBindingTo (/xyz/node_modules/@babel/traverse/lib/scope/index.js:867:13)
at BlockScoping.updateScopeInfo (/xyz/node_modules/babel-plugin-transform-es2015-block-scoping/lib/index.js:364:17)
at BlockScoping.run (/xyz/node_modules/babel-plugin-transform-es2015-block-scoping/lib/index.js:330:12)
at PluginPass.BlockStatementSwitchStatementProgram (/xyz/node_modules/babel-plugin-transform-es2015-block-scoping/lib/index.js:70:24)
at newFn (/xyz/node_modules/@babel/traverse/lib/visitors.js:193:21)
at NodePath._call (/xyz/node_modules/@babel/traverse/lib/path/context.js:53:20)
at NodePath.call (/xyz/node_modules/@babel/traverse/lib/path/context.js:40:17)
at NodePath.visit (/xyz/node_modules/@babel/traverse/lib/path/context.js:88:12)
at TraversalContext.visitQueue (/xyz/node_modules/@babel/traverse/lib/context.js:118:16)
at TraversalContext.visitSingle (/xyz/node_modules/@babel/traverse/lib/context.js:90:19)
What did I do wrong?
我做错了什么？
回答by connexo
In your .babelrcfile, change
在您的.babelrc文件中，更改
{ "presets": ["env"] }
to
到
{ "presets": ["@babel/preset-env"] }
(and install that package if you haven't already).
（如果您还没有安装该软件包，请安装该软件包）。
In your .babelrcyou are still referencing the package babel-preset-env(which is for 6.x), you want to reference @babel/preset-envinstead (which is for 7.x).
在您.babelrc仍然引用包babel-preset-env（适用于 6.x）中，您想要引用@babel/preset-env（适用于 7.x）。
https://github.com/babel/babel/issues/6186#issuecomment-366556833
https://github.com/babel/babel/issues/6186#issuecomment-366556833
Note:you should also make this change in webpack.config.jsif it is there as well.
注意：webpack.config.js如果它也存在，您也应该进行此更改。
Here is the sample webpack config section where you should change the preset:
这是您应该更改预设的示例 webpack 配置部分：
use: {
loader: 'babel-loader',
options: {
// Here you should change 'env' to '@babel/preset-env'
presets: ['@babel/preset-env'],
},
},
