【发布时间】：2022-11-04 00:34:10
【问题描述】：
我有以下 babel.config。js（不是 .rc）文件：
module.exports = function (api) {
api.cache(true);
return {
"presets": [
"@babel/preset-react",
[
"@babel/preset-env",
{
"useBuiltIns": "entry",
"corejs": "3.8",
targets: {
chrome: 97 // January 2022
},
"modules": false
}
]
],
"plugins": [
["@babel/plugin-transform-react-jsx", {
"throwIfNamespace": false, // defaults to true
"runtime": "automatic" // defaults to classic
}],
"@babel/plugin-proposal-class-properties",
"@babel/plugin-transform-object-assign",
"@babel/plugin-proposal-object-rest-spread",
["module:fast-async", { "spec": true }]
]
}
我发现即使我的目标是现代浏览器（Chrome v97，2022 年 1 月发布），Babel 仍然将 async/await 转换为基于 Promise 的代码。
我想以 ES2021 为目标，因此 Babel 不需要转译 async/await。
另外我想使用 ??和 ？。运营商。事实上，任何 ES2021 都支持。
我知道有插件可以模拟大多数东西，但我的目标浏览器已经支持 ES2021。我只是不知道如何告诉 Babel“如果浏览器已经支持它就不要编译。”。
我该怎么做？
这是我的 package.json：
{
"name": "scts-expenses",
"version": "0.1.0",
"description": "",
"scripts": {
"build": "webpack --config tools/webpack/config/build",
"ci": "webpack --config tools/webpack/config/integration",
"dev": "webpack --config tools/webpack/config/dev",
"lint": "node_modules/.bin/eslint src -c .eslintrc --ext js",
"start": "npm run dev",
"test": "node_modules/.bin/jest",
"watch-dev": "webpack --config tools/webpack/config/dev --watch"
},
"author": "scott",
"license": "MIT",
"devDependencies": {
"@babel/cli": "^7.18.10",
"@babel/core": "^7.12.10",
"@babel/node": "^7.18.10",
"@babel/plugin-proposal-class-properties": "^7.18.6",
"@babel/plugin-proposal-object-rest-spread": "^7.12.1",
"@babel/plugin-syntax-dynamic-import": "^7.8.3",
"@babel/plugin-transform-object-assign": "^7.18.6",
"@babel/plugin-transform-react-jsx": "^7.18.10",
"@babel/preset-env": "^7.12.11",
"@babel/preset-react": "^7.18.6",
"autoprefixer": "^9.8.6",
"babel-core": "7.0.0-bridge.0",
"babel-jest": "^23.4.2",
"babel-loader": "^8.2.5",
"babel-plugin-syntax-dynamic-import": "^6.18.0",
"bluebird": "^3.7.2",
"browser-sync": "^2.26.13",
"browser-sync-webpack-plugin": "^2.3.0",
"clean-webpack-plugin": "^3.0.0",
"copy-webpack-plugin": "^5.1.2",
"cors": "^2.8.5",
"cross-env": "^5.2.0",
"css-loader": "^3.6.0",
"eslint": "^6.8.0",
"eslint-plugin-babel": "^5.3.1",
"eslint-plugin-jest": "^23.20.0",
"eval": "^0.1.4",
"fast-async": "^6.3.8",
"filemanager-webpack-plugin": "^2.0.5",
"imagemin-webpack-plugin": "^2.4.2",
"jest": "^24.9.0",
"jest-axe": "^3.5.0",
"mini-css-extract-plugin": "^0.8.2",
"node-sass": "^4.14.1",
"postcss": "^7.0.35",
"postcss-css-variables": "^0.13.0",
"postcss-custom-properties": "^9.2.0",
"postcss-loader": "^3.0.0",
"preact": "^10.10.6",
"preact-render-to-json": "^3.6.6",
"preact-render-to-string": "^5.2.2",
"sass-loader": "^8.0.2",
"style-loader": "^1.3.0",
"webpack": "^4.46.0",
"webpack-cli": "^3.3.12",
"webpack-dev-server": "^3.11.0",
"webpack-hot-middleware": "^2.25.0",
"webpack-merge": "^4.2.2"
},
"dependencies": {
"@microsoft/applicationinsights-web": "^2.5.10",
"abortcontroller-polyfill": "^1.7.3",
"core-js": "^3.25.0",
"custom-event-polyfill": "^1.0.7",
"element-closest-polyfill": "^1.0.2",
"es6-object-assign": "^1.1.0",
"form-request-submit-polyfill": "^2.0.0",
"picturefill": "^3.0.3",
"promise-polyfill": "^8.2.0",
"react": "^17.0.1",
"react-dom": "^17.0.1",
"storm-modal": "^1.2.1",
"storm-tabs": "^1.3.3",
"unfetch": "^4.2.0",
"url-search-params-polyfill": "^8.1.0"
}
}
【问题讨论】：
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标签： javascript reactjs babeljs