通过运行以下命令,我刚刚从6 升级到Babel 7:
npm remove babel-cli npm install --save-dev @babel/cli @babel/core @babel/preset-env
这是我的.babelrc文件:
.babelrc
{ "presets": ["env"] }
然后我跑了:
babel js/src --out-dir js/dist
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)
我做错什么了?
在您的.babelrc文件中,更改
至
{ "presets": ["@babel/preset-env"] }
(如果尚未安装,请安装该软件包)。
在您.babelrc仍在引用程序包babel-preset-env(适用于6.x)的情况下,您想要引用@babel/preset- env(对于7.x适用)。
babel-preset-env
@babel/preset- env
https://github.com/babel/babel/issues/6186#issuecomment-366556833
注意:webpack.config.js如果还存在,还应该进行此更改。
webpack.config.js
这是样本Webpack配置部分,您应在其中更改预设:
use: { loader: 'babel-loader', options: { // Here you should change 'env' to '@babel/preset-env' presets: ['@babel/preset-env'], }, },