loose-envify1

Usage

Overview

Performs a Javascript source-to-source transformation (transpiling), that efficiently replaces Node.js process.env environment variables with plain strings. This makes the environment variable checks faster and easier to optimize out.

Examples

Running this source code:

if (process.env.NODE_ENV === "development") {
  console.log('development only')
}

through loose-envify:

loose-envify index.js > bundle.js

with NODE_ENV set to production results in:

if ("production" === "development") {
  console.log('development only')
}

which, when run through a minifier, would be stripped out completely.

However, if you run the same script through loose-envify with NODE_ENV set to development it gives:

if ("development" === "development") {
  console.log('development only')
}

The if statement will evaluate to true, so the code won't be removed.