error in ./node_modules/@lit/reactive-element/decorators/state.jsModule parse failed: Unexpected

最近开发一个老项目，发现之前好好的项目现在运行起来报错了，各种切换npm 源和 node版本都不行，百度和谷歌都没找到相关信息，报错如下，

error in ./node_modules/@lit/reactive-element/decorators/state.js

Module parse failed: Unexpected token (6:27)
You may need an appropriate loader to handle this file type.
| * Copyright 2017 Google LLC
| * SPDX-License-Identifier: BSD-3-Clause
| */function t(t){return r({...t,state:!0})}export{t as state};
| //# sourceMappingURL=state.js.map

说是处理不了当前文件。

 error  in ./node_modules/@lit/reactive-element/decorators/state.jsModule parse failed: Unexpected token (6:27)
You may need an appropriate loader to handle this file type.
|  * Copyright 2017 Google LLC
|  * SPDX-License-Identifier: BSD-3-Clause
|  */function t(t){return r({...t,state:!0})}export{t as state};
| //# sourceMappingURL=state.js.map
|

发现是@lit这个模块下的文件报错，点开详情发现这里的是源文件，并不是es5语法。

看了下package.json里的版本号用的是^,意味着这个模块可以自动小版本升级。猜想应该是模块自动升级了，导致某些地方不兼容所以报错了，

最后发现项目中配置了，babel解析，这个插件输入出的是es6代码，需要用bable编译一下。

      {test: /\.js$/,loader: 'babel-loader',include: [[resolve('src'), resolve('/node_modules/_@lit')]],}

看报错信息是./node_modules/@lit/reactive-element ,原来新版的原路径改成了 @lit，旧版是_@lit 所以没有经过bable解析，导致报错。经过如下修改增加了新的解析路径，问题得到解决。

      {test: /\.js$/,loader: 'babel-loader',include: [[resolve('src'), resolve('/node_modules/_@lit'),resolve('/node_modules/@lit')]],}

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error in ./node_modules/@lit/reactive-element/decorators/state.jsModule parse failed: Unexpected

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