webpack.config.js中的json-loader无法正常工作

Question

我正在尝试按照反应教程,我的webpack.config.js文件如下:

var webpack = require("webpack");
var pth = require("path");

module.exports = {
entry: "./src/index.js",
output: {
    path: __dirname + "/dist",
    filename: "bundle.js"
},
devServer: {
    inline: true,
    contentBase: './dist',
    port: 3000
},
module: {
    rules: [
      { test: /\.js$/, exclude: /(node_modules)/, use: 'babel-loader' },
      { test: /\.json$/, exclude: /(node_modules)/, use: 'json-loader' }
    ]
  }
} 

虽然我的代码文件如下:我在lib.js中创建了组件,并且在index.js中完成了渲染,最终在index.html的HTML div中调用

lib.js

import React from 'react'
import text from './titles.json'

export const hello = (
<h1 id='title'
    className='header'
    style={{backgroundColor: 'purple', color: 'yellow'}}>
    {text.hello}    
</h1>
)


export const goodbye = (
<h1 id='title'
    className='header'
    style={{backgroundColor: 'white', color: 'red'}}>
    {text.goodbye}    
</h1>
)

index.js

import React from 'react'
import {render} from 'react-dom'
import {hello, goodbye} from './lib'


const design = {
backgroundColor: 'red',
color: 'white',
fontFamily:'verdana'
}


render(
<div>
    {hello}
    {goodbye}
</div>,    
document.getElementById('react-container')
)

当我运行webpack -w命令时,我遇到以下错误

ERROR in ./src/titles.json
Module parse failed: Unexpected token m in JSON at position 0
You may need an appropriate loader to handle this file type.
SyntaxError: Unexpected token m in JSON at position 0
at Object.parse (native)
at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:447:3)
@ ./src/lib.js 12:14-38
@ ./src/index.js

ERROR in chunk main [entry]
bundle.js
Cannot read property 'replace' of undefined

我的JSON文件如下:titles.json

{
    "hello": "Bonjour!",
    "goodbye": "Au Revoir"

}

我的模块版本如下:webpack 4.1.1 json-loader 0.5.7

我使用npm install TIA全局安装了webpack和json-loader

Answer 1

我注意到你正在使用webpack 4.根据json-loader自述文件:

由于webpack> = v2.0.0,默认情况下导入JSON文件将起作用

因此,如果您正在使用webpack >= v2.0.0和json-loader一起,该文件将被转换两次导致该问题.解决方案就是删除json-loader规则.