Babel 7不会将CONST更改为VAR [英] Babel 7 doesn't change CONST to VAR

问题描述

我在Safari版本< = 9时遇到问题. Babel似乎没有用var代替const.

I have problem with Safari version <= 9. Babel doesn't seem to replace const with var.

我在控制台中收到此错误:

I get this error in console:

意外的关键字"const".在严格模式下不支持const声明.

我尝试使用@ babel/preset-stage-0，但babel删除了它.

I tried using @babel/preset-stage-0 but babel removed it.

这是我的应用配置:

.babelrc

{
  "presets": [
    "@babel/preset-env",
    "@babel/preset-react"
  ],
  "plugins": [
    "@babel/plugin-transform-object-assign"
  ]
}

webpack.config.js

webpack.config.js

const path = require("path");
const webpack = require("webpack");
const componentName = "contact-captain";
const publicFolderRelativePath = "../../../../public/js";
const ignorePlugin = new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/);


module.exports = {
    // devtool: "source-map",
    output: {
        path: path.resolve(__dirname, publicFolderRelativePath),
        filename: `${componentName}.js`
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader"
                }
            }
        ]
    },
    plugins: [
        ignorePlugin
    ]
};

推荐答案

您尝试配置preset-env吗? 您可以在此处找到浏览器列表: https://github.com/browserslist/browserslist

did you try to configure preset-env ? you can find the browsers list here: https://github.com/browserslist/browserslist

可能需要在列表中添加Safari 8 ...

probably need to add Safari 8 in your list...

["@babel/preset-env", {
  "targets": {
    "browsers": ["last 2 versions"],
  }
}]

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