Question

安装

npm install babel-preset-minify --save-dev

用法

Via .babelrc 配置文件（推荐）

.babelrc

{
  "presets": ["minify"]
}

或通过参数设置 -

{
  "presets": [["minify", {
    "mangle": {
      "exclude": ["MyCustomError"]
    },
    "unsafe": {
      "typeConstructors": false
    },
    "keepFnName": true
  }]]
}

通过命令行工具（CLI）

babel script.js --presets minify

通过 Node API

require("@babel/core").transform("code", {
  presets: ["minify"]
});

参数

有两种类型的参数：

1. 通过插件一比一地映射
2. 相同的参数传递给多个插件

通过插件一比一地映射

• false - 关闭插件
• true - 开启插件
• { ...pluginOpts } - 开启插件并将 pluginOpts 传递给插件

参数名	插件	默认值
booleans	transform-minify-booleans	true
builtIns	minify-builtins	true
consecutiveAdds	transform-inline-consecutive-adds	true
deadcode	minify-dead-code-elimination	true
evaluate	minify-constant-folding	true
flipComparisons	minify-flip-comparisons	true
guards	minify-guarded-expressions	true
infinity	minify-infinity	true
mangle	minify-mangle-names	true
memberExpressions	transform-member-expression-literals	true
mergeVars	transform-merge-sibling-variables	true
numericLiterals	minify-numeric-literals	true
propertyLiterals	transform-property-literals	true
regexpConstructors	transform-regexp-constructors	true
removeConsole	transform-remove-console	false
removeDebugger	transform-remove-debugger	false
removeUndefined	transform-remove-undefined	true
replace	minify-replace	true
simplify	minify-simplify	true
simplifyComparisons	transform-simplify-comparison-operators	true
typeConstructors	minify-type-constructors	true
undefinedToVoid	transform-undefined-to-void	true

相同的参数传递给多个插件

• 当多个插件需要相同的参数时，在一个地方声明更容易控制。然后将这些参数传递给两个或多个插件。

参数名	插件
keepFnName	Passed to mangle & deadcode
keepClassName	Passed to mangle & deadcode
tdz	Passed to builtIns, evaluate, deadcode, removeUndefined

示例

{
  "presets": [["minify", {
    "evaluate": false,
    "mangle": true
  }]]
}

{
  "presets": [["minify", {
    "mangle": {
      "exclude": ["ParserError", "NetworkError"]
    }
  }]]
}

{
  "presets": [["minify", {
    "keepFnName": true
  }]]
}
// is the same as
{
  "presets": [["minify", {
    "mangle": {
      "keepFnName": true
    },
    "deadcode": {
      "keepFnName": true
    }
  }]]
}