Monday, June 3, 2024
 Popular · Latest · Hot · Upcoming
152
rated 0 times [  153] [ 1]  / answers: 1 / hits: 10965  / 3 Years ago, fri, february 5, 2021, 12:00:00

Can someone help me? I just create react app then I start it immediately. Then I got an error something like this. I don't know much about webpack.


CMD


./src/index.js 1:48
Module parse failed: Unexpected token (1:48)
File was processed with these loaders:
* ./node_modules/@pmmmwh/react-refresh-webpack-plugin/loader/index.js
* ./node_modules/babel-loader/lib/index.js
You may need an additional loader to handle the result of these loaders.
> $RefreshRuntime$ = require('C:/Users/LENOVO/Mine/project-new/node_modules/react-refresh/runtime.js');
| $RefreshSetup$(module.id);
|

I just type npx create-react-app ./ in the directory then npm start then this error happened.
I have tried to make 3 react app and same thing happened and i never touch the webpack before.


App.js


import logo from './logo.svg';
import './App.css';

function App() {
return (
<div className="App">
<header className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<p>
Edit <code>src/App.js</code> and save to reload.
</p>
<a
className="App-link"
href="https://reactjs.org"
target="_blank"
rel="noopener noreferrer"
>
Learn React
</a>
</header>
</div>
);
}

export default App;


This is my webpack.config.js
https://pastebin.com/NVHdYGGN


@pmmmwh/react-refresh-webpack-plugin/loader/index.js


// This is a patch for mozilla/source-map#349 -
// internally, it uses the existence of the `fetch` global to toggle browser behaviours.
// That check, however, will break when `fetch` polyfills are used for SSR setups.
// We "reset" the polyfill here to ensure it won't interfere with source-map generation.
const originalFetch = global.fetch;
delete global.fetch;

const { SourceMapConsumer, SourceMapGenerator, SourceNode } = require('source-map');
const { Template } = require('webpack');

/**
* Generates an identity source map from a source file.
* @param {string} source The content of the source file.
* @param {string} resourcePath The name of the source file.
* @returns {import('source-map').RawSourceMap} The identity source map.
*/
function getIdentitySourceMap(source, resourcePath) {
const sourceMap = new SourceMapGenerator();
sourceMap.setSourceContent(resourcePath, source);

source.split('n').forEach((line, index) => {
sourceMap.addMapping({
source: resourcePath,
original: {
line: index + 1,
column: 0,
},
generated: {
line: index + 1,
column: 0,
},
});
});

return sourceMap.toJSON();
}

/**
* Gets a runtime template from provided function.
* @param {function(): void} fn A function containing the runtime template.
* @returns {string} The "sanitized" runtime template.
*/
function getTemplate(fn) {
return Template.getFunctionContent(fn).trim().replace(/^ {2}/gm, '');
}

const RefreshSetupRuntime = getTemplate(require('./RefreshSetup.runtime')).replace(
'$RefreshRuntimePath$',
require.resolve('react-refresh/runtime').replace(/\/g, '/')
);
const RefreshModuleRuntime = getTemplate(require('./RefreshModule.runtime'));

/**
* A simple Webpack loader to inject react-refresh HMR code into modules.
*
* [Reference for Loader API](https://webpack.js.org/api/loaders/)
* @this {import('webpack').loader.LoaderContext}
* @param {string} source The original module source code.
* @param {import('source-map').RawSourceMap} [inputSourceMap] The source map of the module.
* @param {*} [meta] The loader metadata passed in.
* @returns {void}
*/
function ReactRefreshLoader(source, inputSourceMap, meta) {
const callback = this.async();

/**
* @this {import('webpack').loader.LoaderContext}
* @param {string} source
* @param {import('source-map').RawSourceMap} [inputSourceMap]
* @returns {Promise<[string, import('source-map').RawSourceMap]>}
*/
async function _loader(source, inputSourceMap) {
if (this.sourceMap) {
let originalSourceMap = inputSourceMap;
if (!originalSourceMap) {
originalSourceMap = getIdentitySourceMap(source, this.resourcePath);
}

const node = SourceNode.fromStringWithSourceMap(
source,
await new SourceMapConsumer(originalSourceMap)
);

node.prepend([RefreshSetupRuntime, 'nn']);
node.add(['nn', RefreshModuleRuntime]);

const { code, map } = node.toStringWithSourceMap();
return [code, map.toJSON()];
} else {
return [[RefreshSetupRuntime, source, RefreshModuleRuntime].join('nn'), inputSourceMap];
}
}

_loader.call(this, source, inputSourceMap).then(
([code, map]) => {
callback(null, code, map, meta);
},
(error) => {
callback(error);
}
);
}

module.exports = ReactRefreshLoader;

// Restore the original value of the `fetch` global, if it exists
if (originalFetch) {
global.fetch = originalFetch;
}


babel-loader/lib/index.js
https://pastebin.com/sXm9sz0n


Thanks in advance


More From » reactjs

 Answers
8

+There seems to be an issue with the new release 4.0.2 of create-react-app [Reference].

You can use the previous, 4.0.1, by doing the following.



  1. Edit package.json and change the "react-scripts" value to "4.0.1".

  2. Run npm install.

  3. Run npm start.


[#1836] Saturday, January 30, 2021, 3 Years  [reply] [flag answer]
Only authorized users can answer the question. Please sign in first, or register a free account.
asalewisc

Total Points: 742
Total Questions: 98
Total Answers: 112

Location: Jordan
Member since Wed, Jun 17, 2020
4 Years ago
;