我是React和Jest的新手，在我的第一个实验中，我在运行jest --watchAll时遇到以下错误：
FAIL src/components/App.test.js
● Test suite failed to run
Cannot find module '@babel/preset-register' from '/Users/joaomatos/projects/dummy'
- If you want to resolve "@babel/register", use "module:@babel/register"
at Function.module.exports [as sync] (node_modules/resolve/lib/sync.js:74:15)
at resolveStandardizedName (node_modules/@babel/core/lib/config/files/plugins.js:101:31)
at resolvePreset (node_modules/@babel/core/lib/config/files/plugins.js:58:10)
at loadPreset (node_modules/@babel/core/lib/config/files/plugins.js:77:20)
at createDescriptor (node_modules/@babel/core/lib/config/config-descriptors.js:154:9)
at node_modules/@babel/core/lib/config/config-descriptors.js:109:50
at Array.map (<anonymous>)
at createDescriptors (node_modules/@babel/core/lib/config/config-descriptors.js:109:29)
at createPresetDescriptors (node_modules/@babel/core/lib/config/config-descriptors.js:101:10)
at presets (node_modules/@babel/core/lib/config/config-descriptors.js:47:19)
我安装了几个babel软件包，即babel register，但找不到与@babel/preset-register相关的其他内容。我的package.json：
{
"name": "dummy",
"version": "0.1.0",
"private": true,
"dependencies": {
"@babel/preset-env": "^7.7.1",
"acorn": "^7.1.0",
"babel-plugin-transform-export-extensions": "^6.22.0",
"babel-preset-env": "^1.7.0",
"history": "^4.10.1",
"npm-preset": "^1.5.0",
"parcel": "^1.12.4",
"react": "^16.11.0",
"react-app-polyfill": "^1.0.4",
"react-dev-utils": "^9.1.0",
"react-dom": "^16.6.3",
"react-dropzone": "^10.1.10",
"react-file-drop": "^0.2.8",
"react-flip-move": "^3.0.4",
"react-redux": "^6.0.0",
"react-router-dom": "^4.3.1",
"react-scripts": "3.2.0",
"react-switch": "^5.0.1",
"react-test-renderer": "^16.11.0",
"redux": "^4.0.4",
"typescript": "^3.7.2"
},
"scripts": {
"dev": "parcel src/index.html",
"build": "parcel build src/index.html",
"start": "npm run build && live-server dist",
"test": "jest --watchAll"
},
"devDependencies": {
"@babel/core": "^7.7.2",
"@babel/plugin-proposal-class-properties": "^7.7.0",
"@babel/preset-react": "^7.7.0",
"@babel/preset-stage-2": "^7.0.0",
"@babel/register": "^7.7.0",
"babel-loader": "^8.0.6",
"babel-plugin-syntax-dynamic-import": "^6.18.0",
"babel-plugin-transform-class-properties": "^6.24.1",
"babel-plugin-transform-runtime": "^6.23.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"babel-preset-stage-0": "^6.24.1"
}
}
和.babel.rc：
{
"plugins": [
"@babel/plugin-proposal-class-properties"
],
"env": {
"test": {
"presets": [
"env",
"@babel/preset-env",
"@babel/preset-react",
"@babel/preset-stage-2",
"@babel/register",
"stage-2",
"react"
],
"plugins": [
"transform-export-extensions",
"transform-class-properties"
],
"only": [
"./**/*.js",
"node_modules/jest-runtime"
]
}
}
我的测试：
import React from 'react';
import Enzyme, {shallow} from 'enzyme';
import EnzymeAdapter from 'enzyme-adapter-react-16';
import App from './App';
Enzyme.configure({adapter: new EnzymeAdapter()});
test(
'renders without crashing',
() => {
const wrapper = shallow(<App />);
expect(wrapper).toBeTruthy();
}
);
有人知道我为什么收到此错误吗？
谢谢您的帮助。