找不到模块“@babel/core”

我遵循这个 webpack4/response 教程:

Https://www.youtube.com/watch?v=deyxi-6c2u4

我一直跟着它，直到他运行 npm 的部分开始。不同的是，他的应用程序运行，而我的得到了错误:

找不到模块“@babel/core”

完全错误:

ERROR in ./src/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module '@babel/core'
at Function.Module._resolveFilename (module.js:547:15)
at Function.Module._load (module.js:474:25)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (C:\Users\joeyf\Desktop\Code\Github\webpack4-sample\node_modules\babel-loader\lib\index.js:5:15)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
@ multi (webpack)-dev-server/client?http://localhost:8080 (webpack)/hot/dev-server.js ./src/index.js main[2]

我尝试重新安装 babel-core，但仍然找不到:

{
"name": "webpack4-sample",
"version": "1.0.0",
"description": "A sample setup of Webpack4 with React and Babel",
"main": "index.js",
"scripts": {
"start": "webpack-dev-server --mode development --open --hot",
"build": "webpack --mode production"
},
"author": "Joey Fenny",
"license": "ISC",
"dependencies": {
"babel": "^6.23.0",
"babel-cli": "^6.26.0",
"react": "^16.4.2",
"react-dom": "^16.4.2"
},
"devDependencies": {
"babel-core": "^7.0.0-rc.4",
"babel-loader": "^8.0.0",
"babel-preset-env": "^1.7.0",
"babel-preset-react": "^6.24.1",
"html-webpack-plugin": "^3.2.0",
"webpack": "^4.17.1",
"webpack-cli": "^3.1.0",
"webpack-dev-server": "^3.1.6"
}
}

我的 webpack.config.js:

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');


module.exports = {
entry: './src/index.js',
output: {
path: path.join(__dirname, '/dist'),
filename: 'index_bundle.js'
},
module: {
rules: [{
test: /\.js$/,
exclude: path.join(__dirname, '/node_modules'),
use: {
loader: 'babel-loader'
}
}]
},
plugins: [
new HtmlWebpackPlugin({
template: './src/index.html'
})
]
}

下面是一个 Git 回购的链接:

Https://gitlab.com/jfny/webpack4-sample

有人知道怎么回事吗? 谢谢。

154750 次浏览
小开
最佳答案

Try running this.

npm install @babel/core --save

babel changed their package so your babel-core will not be the same as @babel/core.

小开

The recent Babel upgrade to version 7 changed the namings of the node packages.

For instance, now you have to install 

npm install --save-dev @babel/core @babel/preset-env

and 

npm install --save-dev @babel/preset-react

to get it working with React. Then you can use these in your .babelrc file:

{
"presets": [
"@babel/preset-env",
"@babel/preset-react"
]
}

Or as alternative, when not having a .babelrc, in your package.json:

...
"keywords": [],
"author": "",
"license": "ISC",
"babel": {
"presets": [
"@babel/preset-env",
"@babel/preset-react"
]
},
"devDependencies": {
...

If you want to get more into it, you can checkout this recent Webpack + Babel + React setup.

小开

I am able to fix this issue using below command

npm install @babel/core --save
小开

babel-loader@8 requires Babel 7.x (the package '@babel/core'). If you'd like to use Babel 6.x ('babel-core'), you should install 'babel-loader@7'.

小开

In my case I had to uninstall babel 6 

npm uninstall --save-dev babel-cli  babel-core babel-polyfill babel-preset-es2015 babel-preset-stage-2 babel-register

and then reinstall babel 7

npm i  --save-dev  @babel/cli  @babel/core @babel/node  @babel/polyfill  @babel/preset-env

and it worked for me.

小开

for those of you who use @babel/core alongside babel-node: i just installed @babel/core using npm i @babel/core --save-dev but when i tried to use babel-node it does not recognized the @babel/core package, i uninstalled @babel/core and installed it again using npm i @babel/core --save and it worked again!

小开

try to install npm install @babel/core --save if it does not work try to uninstall node_modules and reinstall

小开

I solved the same error by removing all the babel modules from dev Dependencies executing the below command:

npm install -D babel-loader @babel/core @babel/preset-env

You can refer to this link if the above command does not work:

[https://github.com/babel/babel/issues/8599#issuecomment-417866691]

小开

I removed the existing npm uninstall babel-core babel-preset-env babel-preset-react

and added their new names npm install --save-dev @babel/core @babel/preset-env @babel/preset-react that's works for me as perfectly fine.

小开

I fixed with:

 npm install --save-dev babel-loader@7 babel-core babel-preset-env webpack webpack-cli -D
小开

Go in by running on Windows, %USERPROFILE%\.quokka

The ~/.quokka configuration is limited to the config.json file and any packages that exist in ~/quokka/node_modules.

Put the following into config.js,

{
"pro":true,
"babel": {
"presets": ["@babel/preset-env", " @babel/preset-react"],
"plugins": [
["@babel/plugin-proposal-pipeline-operator", { "proposal": "minimal" }],
["@babel/plugin-proposal-decorators", { "legacy": true }],
["@babel/plugin-proposal-class-properties", { "loose": true }]
]
}
}
小开

I've been dealing with this problem for a few hours and it mysteriously disappeared when I added a "devDependencies" section to my package.json file and moved the @types dependencies to it.

小开

if you have react application and you get error change your babel config to below:

 {
"presets": [
[
"@babel/preset-env",
{
"useBuiltIns": "entry",
"corejs": 3,
"modules": false
}
],
"@babel/preset-react"
],
"plugins": [
["@babel/transform-async-to-generator"],
["@babel/plugin-transform-runtime"],
["@babel/syntax-dynamic-import"],
["@babel/plugin-transform-classes", {
"loose": true
}],
[
"babel-plugin-transform-builtin-extend",
{
"globals": ["Error"]
}
]
]

}

小开

my two cents, for people getting started with react, webpack, babel, jsx, I got a problem with npm run build

ERROR in ./src/app.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module 'babel-core'

When you tried to gradually install each component, you might run into a version conflict between packages, i.e., you might ended up with a package.json file like this

  "dependencies": {
"@babel/core": "^7.13.15",
"@babel/preset-env": "^7.13.15",
"@babel/preset-react": "^7.13.13",
"babel-loader": "^7.1.5",
"webpack": "^5.33.2",
"webpack-cli": "^4.6.0"

Clearly, the reported failed to load babel-loader is not because I did not have babel-loader installed. Therefore, I think, I would try to re-install it again with npm i babel-loader.

And, I got this message

$ npm install babel-loader
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: indecision-app@1.0.0
npm ERR! Found: webpack@5.33.2
npm ERR! node_modules/webpack
npm ERR!   webpack@"^5.33.2" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer webpack@"2 || 3 || 4" from babel-loader@7.1.5
npm ERR! node_modules/babel-loader
npm ERR!   babel-loader@"^7.1.5" from the root project

I noticed that I'm using Webpack v.5. Hence, I remove babel-loader from package.json file and do npm i babel-loader again.

This time, npm run build was successful!


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