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var babelPresetMinify = require("babel-preset-minify")

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babel-preset-minify v0.5.1

babel-preset-minify

Babel preset for all minify plugins.

Install

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

Usage

Via .babelrc (Recommended)

.babelrc

{
  "presets": ["minify"]
}

or pass in options -

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

Via CLI

babel script.js --presets minify

Via Node API

const babel = require("@babel/core");
const fs = require("fs");

const code = fs.readFileSync("./input.js").toString();

const minified = babel.transform(code, {
  presets: ["minify"]
});

Options

Two types of options:

  1. 1-1 mapping with plugin
  2. The same option passed to multiple plugins

1-1 mapping with plugin

  • false - disable plugin
  • true - enable plugin
  • { ...pluginOpts } - enable plugin and pass pluginOpts to plugin
OptionNamePluginDefaultValue
booleanstransform-minify-booleanstrue
builtInsminify-builtinstrue
consecutiveAddstransform-inline-consecutive-addstrue
deadcodeminify-dead-code-eliminationtrue
evaluateminify-constant-foldingtrue
flipComparisonsminify-flip-comparisonstrue
guardsminify-guarded-expressionstrue
infinityminify-infinitytrue
mangleminify-mangle-namestrue
memberExpressionstransform-member-expression-literalstrue
mergeVarstransform-merge-sibling-variablestrue
numericLiteralsminify-numeric-literalstrue
propertyLiteralstransform-property-literalstrue
regexpConstructorstransform-regexp-constructorstrue
removeConsoletransform-remove-consolefalse
removeDebuggertransform-remove-debuggerfalse
removeUndefinedtransform-remove-undefinedtrue
replaceminify-replacetrue
simplifyminify-simplifytrue
simplifyComparisonstransform-simplify-comparison-operatorstrue
typeConstructorsminify-type-constructorstrue
undefinedToVoidtransform-undefined-to-voidtrue

The same option passed to multiple plugins

  • When multiple plugins require the same option, it's easier to declare it in one place. These options are passed on to two or more plugins.
OptionNamePlugins
keepFnNamePassed to mangle & deadcode
keepClassNamePassed to mangle & deadcode
tdzPassed to builtIns, evaluate, deadcode, removeUndefined

Examples

{
  "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
    }
  }]]
}
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