我正在尝试通过 @babel/polyfill
和 browserslist
改善我的应用程序的支持,该应用程序是用 ES6 写的。我已经遵循了 https://babeljs.io/docs/en/babel-polyfill 上的所有说明,但我觉得我漏掉了些什么。
我的 browserslist
支持是通过 package.json 定义的。我通过检查代码中使用的 Array.from
polyfill 来验证安装是否成功。
为什么我看不到编译后的代码中的 polyfill 呢?以前我会在入口点声明 polyfill,但是现在 babel 文档说这不再需要。
如果在 .babelrc 中指定了 useBuiltIns: 'usage',则不要在 webpack.config.js 的 entry 数组中或源文件中包含 @babel/polyfill。注意,仍然需要安装 @babel/polyfill。
...
"browserslist": [
"last 2 version",
"> 1%",
"IE 10"
],
"devDependencies": {
"@babel/core": "^7.4.0",
"@babel/plugin-syntax-dynamic-import": "^7.0.0",
"@babel/preset-env": "^7.4.2",
"babel-core": "^6.26.3",
"babel-loader": "^8.0.0-beta.4",
"babel-preset-env": "^1.7.0",
"chromedriver": "^2.41.0",
"clean-webpack-plugin": "^0.1.19",
"copy-webpack-plugin": "^4.6.0",
"css-loader": "^1.0.0",
"cssnano": "^4.1.4",
"env2": "^2.2.2",
"file-loader": "^1.1.11",
"html-critical-webpack-plugin": "^2.1.0",
"html-webpack-plugin": "^3.2.0",
"lunr": "^2.3.5",
"mini-css-extract-plugin": "^0.4.1",
"nightwatch": "^0.9.21",
"node": "^7.10.1",
"node-sass": "^4.11.0",
"optimize-css-assets-webpack-plugin": "^5.0.1",
"replace-in-file-webpack-plugin": "^1.0.6",
"sass-loader": "^7.0.3",
"selenium-server": "^3.14.0",
"selenium-standalone": "^6.15.6",
"style-loader": "^0.21.0",
"webpack": "^4.17.2",
"webpack-cli": "^3.1.0",
"webpack-dev-server": "^3.2.1",
"webpack-merge": "^4.1.3"
},
"dependencies": {
"@babel/polyfill": "^7.4.0",
"bootstrap": "^4.1.3",
"handlebars": "^4.1.0",
}
我的.babelrc
文件的内容如下:
{
"presets": [
[
"@babel/preset-env", {
"useBuiltIns": "usage"
}
]
],
"plugins": ["@babel/plugin-syntax-dynamic-import"],
}
我的webpack文件看起来像这样:
{
test: /\.js$/,
use: {
loader: 'babel-loader',
options: {
presets: ['@babel/preset-env']
}
}
}]
@babel/preset-env
(7.4.4),它会根据你的浏览器列表配置为我添加Array.from
,并且我在源代码中使用了Array.from
。我没有尝试过你的插件(如果有影响,我正在使用其他插件与 rollup)。 - Brett Zamir