babel-plugin-constif

This plugin allows Babel to remove if conditionals with string literals as condition.

Example

In

if ("isDebug")
	console.log(1);
else
	console.log(2);

Out

// IS_DEBUG=true babel script.js
console.log(1);

// IS_DEBUG=false babel script.js
console.log(2);

// babel script.js
if ("isDebug")
	console.log(1);
else
	console.log(2);

Installation

npm install --save-dev babel-plugin-constif

Usage

Via .babelrc (Recommended)

.babelrc

{
  "plugins": [
    ["constif", {var1: true, var2:false}]
  ]
}

Via CLI

VAR1=true VAR2=0 babel --plugins constif script.js

Via Node API

require("babel-core").transform("code", {
  plugins: [
    ["constif", {var1: true, var2:false}]
  ]
});