未知选项：./. Unknown .预设

Question

我使用Babel 6进行es2015和react，这需要babel-preset-es2015和babel-preset-react。

我在presets中添加了.babelrc属性，但它引发了一个错误：

ERROR in ./src/client/entry.js
Module build failed: ReferenceError: [BABEL] /Users/brick/Dropbox/learncoding/node.js/isomorphic/src/client/entry.js: Unknown option: /Users/brick/Dropbox/learncoding/node.js/isomorphic/.babelrc.presets
    at Logger.error (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-core/lib/transformation/file/logger.js:58:11)
    at OptionManager.mergeOptions (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-core/lib/transformation/file/options/option-manager.js:126:29)
    at OptionManager.addConfig (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-core/lib/transformation/file/options/option-manager.js:107:10)
    at OptionManager.findConfigs (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-core/lib/transformation/file/options/option-manager.js:168:35)
    at OptionManager.init (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-core/lib/transformation/file/options/option-manager.js:229:12)
    at File.initOptions (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-core/lib/transformation/file/index.js:147:75)
    at new File (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-core/lib/transformation/file/index.js:137:22)
    at Pipeline.transform (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-core/lib/transformation/pipeline.js:164:16)
    at transpile (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-loader/index.js:12:22)
    at Object.module.exports (/Users/brick/Dropbox/learncoding/node.js/isomorphic/node_modules/babel-loader/index.js:69:12)
 @ multi main

我的.babelrc文件是：

{
  "presets": [
    "es2015",
    "react"
  ]
}

我可以运行babel src -d lib命令，它可以工作。但是，如果我运行npm start以通过package.json运行babel，则会出现错误。

我认为我可以忽略这个错误，因为应用程序正在运行。但是我想知道为什么这个错误并且不确定它会影响到什么。

我的scripts in package.json是：

"scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "clean": "rm -rf lib",
    "build": "npm run clean && /usr/local/bin/babel src -d lib --experimental",
    "server": "nodemon lib/server/server",
    "dev-server": "node lib/server/webpack",
    "watch-js": "/usr/local/bin/babel src -d lib --experimental -w",
    "start": "npm run watch-js & npm run dev-server & npm run server"
  },

我的entry.js是

import React from "react";
import Router from "react-router";
import ReactDOM from "react-dom";
import routes from "./routes";
import DataWrapper from './DataWrapper';
import createBrowserHistory from 'history/lib/createBrowserHistory';

let history = createBrowserHistory();
var data = JSON.parse(document.querySelector('#data').innerHTML);
ReactDOM.render(<DataWrapper data={data}><Router history = {history}>{routes}</Router></DataWrapper>, document.querySelector('#app'));

Answer 1

我发现这个问题是由babel-loader和babel-core版本引起的。

在package.json中，依赖项被声明为^5.3.3，因此它不会更新到6.x。将其更改为>=5.3.3或^6.0.0。

^的意思是升级子版本，但不升级主版本。

Answer 2

确保您的node_modules中有这些预先设置的库。

我有类似但略有不同的错误信息。原因是我试图为babel使用react预置，但是babel-react-preset在我的node_modules.The最终结果中丢失了，因为babel试图使用react库的内容作为预置。

ERROR in ./ui/js/myproject.js
Module build failed: ReferenceError: [BABEL] /home/jsyrjala/myproject/ui/js/myproject.js: Unknown option: /home/jsyrjala/myproject/node_modules/react/react.js.Children
    at Logger.error (/home/jsyrjala/myproject/node_modules/babel-core/lib/transformation/file/logger.js:43:11)
    at OptionManager.mergeOptions (/home/jsyrjala/myproject/node_modules/babel-core/lib/transformation/file/options/option-manager.js:270:18)
    at OptionManager.mergePresets (/home/jsyrjala/myproject/node_modules/babel-core/lib/transformation/file/options/option-manager.js:333:16)
    at OptionManager.mergeOptions (/home/jsyrjala/myproject/node_modules/babel

Answer 3

我可以使用babel src --out-dir lib，但不能使用npm run XXX。我在我的机器上安装了babel- CLI @ 6.18.0CLI，在安装babel-cli@ locally项目之后，它可以与npm run一起工作。