reactjs – 无法使箭头功能起作用(React,Babel,Webpack,ES6)

参见英文答案 > How to use arrow functions (public class fields) as class methods?                                    4个
绝望地希望我能找到一个可以告诉我为什么我无法使用箭头功能来处理我的Webpack / Babel设置的人,一直在尝试一堆东西,到目前为止还没有任何工作.项目现状：

的package.json：

{
  "name": "..",
  "version": "1.0.0",
  "description": "..",
  "main": "app.jsx",
  "author": "..",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "^6.22.1",
    "babel-loader": "^6.2.10",
    "babel-plugin-transform-class-properties": "^6.22.0",
    "babel-plugin-transform-react-jsx": "^6.22.0",
    "babel-preset-es2015": "^6.22.0",
    "babel-preset-react": "^6.22.0",
    "babel-preset-stage-2": "^6.22.0",
    "css-loader": "^0.26.1",
    "node-sass": "^4.5.0",
    "sass-loader": "^4.1.1",
    "style-loader": "^0.13.1",
    "webpack": "^2.2.1",
    "webpack-dev-server": "^2.3.0"
  },
  "dependencies": {
    "lodash": "^4.17.4",
    "react": "^15.4.2",
    "react-dom": "^15.4.2",
    "react-router": "^3.0.2"
  }
}

webpack.config.js：

var path = require('path');

module.exports = {
  entry: './src/router.jsx',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'public')
  },
  watch: true,
  module: {
    loaders: [
      {
         test: /\.jsx$/,
         exclude: /(node_modules)/,
         loader: 'babel-loader',
         query: {
           presets: ['react', 'es2015']
         }
      },
      {
        test: /\.scss$/,
        loader: 'style-loader!css-loader!sass-loader'
      },
    ]
  }
};

.babelrc

{
  "plugins": [
    "transform-react-jsx",
    "transform-class-properties"
  ],
  "presets": [
    "es2015",
    "react",
    "stage-2"
  ],
}

零件：

import React from 'react'

import './styles.scss'

class Button extends React.Component {
  asdf = () => {
    return ['btn', this.props.size].join(' ')
  }

  render() {
    return (
      <button className={this.asdf}>
        {this.props.children}
      </button>
    )
  }
}

export default Button

错误：

ERROR in ./src/app/ui-kit/button.jsx
Module build failed: SyntaxError: Missing class properties transform.

  4 |
  5 | class Button extends React.Component {
> 6 |   asdf = () => {
    |   ^
  7 |     return ['btn', this.props.size].join(' ')
  8 |   }
  9 |

 @ ./src/app/components/signup.jsx 13:14-45
 @ ./src/app/app.jsx
 @ ./src/router.jsx

检查我的babel包和.babelrc正在我当前的项目中工作并与你的比较：

.babelrc：

{
  "presets": ["react", "es2015" , "stage-0"],
  "plugins": [
    ["transform-decorators-legacy"]
  ]      
}

packages.json

"babel-core": "^6.4.5",
"babel-eslint": "^6.1.2",
"babel-loader": "^6.2.1",
"babel-plugin-react-transform": "^2.0.0",
"babel-plugin-transform-decorators-legacy": "^1.3.4",
"babel-polyfill": "^6.3.14",
"babel-preset-es2015": "^6.3.13",
"babel-preset-react": "^6.3.13",
"babel-preset-react-hmre": "^1.0.1",
"babel-preset-stage-0": "^6.3.13",