我正在完成React.js Essential培训的Lynda教程,并遇到第13章的问题 - 使用webpack加载JSON。
当我尝试编译并启动服务器时,我收到以下错误:
lat
我的titles.json文件如下所示:
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 JSON.parse (<anonymous>)
at JsonParser.parse (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\lib\JsonParser.js:15:21)
at doBuild.err (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\lib\NormalModule.js:367:32)
at runLoaders (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\lib\NormalModule.js:264:12)
at C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:370:3
at iterateNormalLoaders (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:211:10)
at iterateNormalLoaders (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:218:10)
at C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:233:3
at runSyncOrAsync (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:130:11)
at iterateNormalLoaders (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:229:2)
at Array.<anonymous> (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:202:4)
at Storage.finished (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:43:16)
at provider (C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:79:9)
at C:\Users\pauln\AppData\Roaming\npm\node_modules\webpack\node_modules\graceful-fs\graceful-fs.js:78:16
at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:528:3)
@ ./src/lib.js 12:14-38
@ ./src/index.js
@ multi (webpack)-dev-server/client?http://localhost:2000 ./src/index.js
ERROR in chunk main [entry]
bundle.js
Cannot read property 'replace' of undefined
我做错了什么?
编辑添加我的webpack.config:
{
"hello": "Bonjour",
"goodbye": "Au Reviour"
}
编辑2 添加lib.js文件和index.js文件
lib.js
var webpack = require("webpack");
module.exports = {
entry: __dirname + "/src/index.js",
output: {
path: __dirname + "/dist/assets",
filename: "bundle.js",
publicPath: "assets",
},
devServer: {
inline: true,
contentBase: __dirname + '/dist',
port: 2000
},
module: {
rules: [
{
test: /\.js$/,
exclude: /(node_modules)/,
enforce: "pre",
loader: "babel-loader",
query: {
presets: ["latest", "stage-0", "react"]
}
},
{
test: /\.json$/,
exclude: /(node_modules)/,
loader: "json-loader"
}
]
}
}
Index.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: 'yellow', color: 'purple'}}>
{text.goodbye}
</h1>
)
答案 0 :(得分:28)
我有同样的问题,但是当我查看json-loader文档here时,我发现在webpack版本大于v.2.0时,json-loader不再需要了。
所以你可以从你的webpack配置文件中删除json-loader,假设你正确导入你的json文件,一切都应该工作import text from './titles.json'
答案 1 :(得分:0)
解决此问题的另一种方法是修改package.json
文件以添加browser
部分:
"browser": {
"colors": false,
"events": "eventemitter3",
"checkForModuleDuplicates": false,
"url": "./shims/url",
"tracer": false
}
Webpack将遵守此部分,并忽略设置为: false
的任何内容,否则将从key:value对的值加载相应的模块。
答案 2 :(得分:0)
json-loader
不再不需要了:
⚠️由于webpack> = v2.0.0,默认情况下将导入JSON文件。如果您使用自定义文件扩展名,则可能仍要使用它。
文档:https://webpack.js.org/migrate/3/#json-loader-is-not-required-anymore
答案 3 :(得分:0)
我建议使用 fetch()
:
fetch('./myJsonFile.json')
.then(res => res.json())
.then(data => {
console.log(data);
});