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babel-plugin-minify-dead-code-elimination

Example

In

JavaScript
function foo() {var x = 1;}
function bar() { var x = f(); }
function baz() {
var x = 1;
console.log(x);
function unused() {
return 5;
}
}

Out

JavaScript
function foo() {}
function bar() { f(); }
function baz() {
console.log(1);
}

Installation

npm install babel-plugin-minify-dead-code-elimination --save-dev

Usage

JSON
// without options
{
"plugins": ["minify-dead-code-elimination"]
}

// with options
{
"plugins": ["minify-dead-code-elimination", { "optimizeRawSize": true }]
}

Via CLI

Shell
babel --plugins minify-dead-code-elimination script.js

Via Node API

JavaScript
require("@babel/core").transformSync("code", {
plugins: ["minify-dead-code-elimination"]
});

Options

  • keepFnName - prevent plugin from removing function name. Useful for code depending on fn.name
  • keepFnArgs - prevent plugin from removing function args. Useful for code depending on fn.length
  • keepClassName - prevent plugin from removing class name. Useful for code depending on cls.name
  • tdz - Account for TDZ (Temporal Dead Zone)
tip

You can read more about configuring plugin options here