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JavaScript compiler: Babel

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资源

.babelrc

babel

安装

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npm i -D @babel/core @babel/preset-env @babel/cli

.babelrc

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{
  "env": {
    "production": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "modules": false
          }
        ]
      ]
    }
  },
  "ignore": [
    "node_modules/**"
  ]
}

安装 cross-env

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npm i -D cross-env

package.json

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{
  "scripts": {
    "build": "rollup --config",
    "build:prod": "cross-env BABEL_ENV=production npm run build"
  }
}

Polyfill: core-js

安装

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npm i -D core-js@3

.babelrc

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{
  "env": {
    "production": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "modules": false,
            "useBuiltIns": "usage",
            "corejs": {
              "version": 3,
              "proposals": true
            }
          }
        ]
      ]
    }
  }
}

babel-jest