我目前有一个react应用程序，它没有在IE中运行/呈现，我认为是由于ES5/ES6问题。
我得到的错误是：语法错误。
在下面突出显示的行上。
if(process.env.NODE_ENV == 'production') {
=> module.exports = require('./cjs/react.production.min.js');
} else {
module.exports = require('./cjs/react.development.js');
编译前位于index.js顶部：
import 'babel-polyfill';
import 'react-app-polyfill/ie11';
import 'react-app-polyfill/stable';
package.json:
{
"name": "reactapp",
"version": "0.1.0",
"private": true,
"dependencies": {
"@babel/polyfill": "^7.8.3",
"@material-ui/core": "^3.9.3",
"@material-ui/icons": "^3.0.2",
"@sentry/browser": "^5.10.2",
"adblockdetect": "0.0.2",
"animatewithsass": "^3.2.1",
"axios": "^0.18.1",
"babel-polyfill": "^6.26.0",
"core-js": "^3.6.5",
"date-fns": "^2.10.0",
"detectrtc": "^1.4.0",
"easy-peasy": "^3.2.0",
"formik": "^2.0.3",
"google-map-react": "^1.1.5",
"js-cookie": "^2.2.1",
"lodash": "^4.17.15",
"material-design-icons": "^3.0.1",
"material-icons": "^0.3.1",
"node-sass": "^4.13.0",
"platform": "^1.3.5",
"query-string": "^6.10.1",
"react": "^16.11.0",
"react-albus": "^2.0.0",
"react-app-polyfill": "^1.0.6",
"react-color": "^2.18.0",
"react-confirm-alert": "^2.4.1",
"react-dom": "^16.11.0",
"react-dropzone": "^11.1.0",
"react-loader-spinner": "^3.1.5",
"react-media-recorder": "^1.2.0",
"react-paginate": "^6.3.2",
"react-router-dom": "^5.1.2",
"react-rtc-real": "^1.11.22",
"react-scripts": "2.1.8",
"react-select": "^3.1.0",
"react-simple-line-icons": "^1.0.8",
"react-spring": "^8.0.27",
"react-stripe-elements": "^5.1.0",
"react-stripe-script-loader": "^1.0.16",
"react-switch": "^5.0.1",
"react-toastify": "^5.4.0",
"react-toggle": "^4.1.1",
"react-tooltip": "^3.11.2",
"regenerator-runtime": "^0.13.5",
"semantic-ui-css": "^2.4.1",
"semantic-ui-react": "^0.88.2",
"styled-components": "^4.4.1",
"sweetalert2-react": "^0.8.3",
"videojs": "^1.0.0",
"videojs-record": "^4.0.0",
"webfontloader": "^1.6.28",
"webrtc-adapter": "^7.5.1",
"yup": "^0.27.0"
},
"scripts": {
"start": "react-app-rewired start",
"build": "set NODE_ENV=production && react-app-rewired build",
"test": "react-app-rewired test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all",
"IE 11"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version",
"IE 11"
]
},
"devDependencies": {
"animate-sass": "^0.8.2",
"es-check": "^5.1.1",
"react-app-rewired": "^2.1.6"
}
}
内部.babelrc
{
"presets": ["@babel/env","@babel/preset-react",["@babel/preset-env", { "targets": "defaults" }]],
"plugins" : ["@babel/plugin-syntax-dynamic-import"]
}
有人能指导我如何让babel为ES5正确编译东西吗？你会注意到，我使用的不是弹出，而是重新连接的react应用程序，我认为这不应该引起问题，所以感谢您的帮助。
更新：
"Object doesn't support property or method 'repeat'" - when running in development mode. How do I polyfill this? I think this may be the problem.
这与core js 中的Github问题非常相似
正如该线程中所建议的，您可以将其添加到您的预设配置中
{ modules: false,
useBuiltIns: 'entry',
corejs: 3 }
或者直接导入功能
import 'core-js/features/string/repeat';
首先，在index.js文件中，导入用于导入"babel polyfill"；think应该是@babel/polyfill。但这并不能解决IE 11的问题。
我们也遇到了类似的问题，不得不切换到core-js进行绑定——这是您已经遇到的。但是您需要@babel/core和@babel/runtime-corejs3作为开发依赖项。
您的预设需要更改
presets: [
[
"@babel/preset-env", {
"useBuiltIns": "usage",
corejs: { version: 3, proposals: true }
}
]
]
然后替换index.js 中的代码
imports babel/polyfill;
带有
import 'core-js/stable';
如果您可以使用typescript，那么我建议您可以转换tsconfig.js文件并将target更改为es5。
如果没有，则创建.babelrc文件，并在其中添加以下内容：
{"presets": [["@babel/preset-env",{"useBuiltIns": "entry","forceAllTransforms": true,"corejs": "3.0.0","targets": {"ie": "11"}}]]}