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:
{ "presets": ["env"] }
然后我跑了
babel js/src --out-dir js/dist
结果为:
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)
我做错了什么?
答案 0 :(得分:130)
在您的.babelrc
文件中,更改
{ "presets": ["env"] }
到
{ "presets": ["@babel/preset-env"] }
(如果尚未安装,请安装该软件包)。
在.babelrc
中,您仍在引用包babel-preset-env
(用于6.x),而您想引用@babel/preset-env
(用于7.x)。 / p>
https://github.com/babel/babel/issues/6186#issuecomment-366556833