JavaScript编译器Babel

安装

yarn add --dev @babel/core @babel/cli

package.json

"scripts": {
  "watch": "babel src --out-dir lib --source-maps inline --watch",
  "build": "babel src --out-dir lib --source-maps inline"
},

环境预设

Docs

yarn add --dev @babel/preset-env

.babelrc

{
  "presets": [
    [
      "@babel/preset-env", {
        "targets": "> 0.25%, not dead"
      }
    ]
  ]
}