esmin

Utility to minify code targeting ES2015+

Currently joins literals and tries to eliminate unreachable code, using babel to output without whitespace and comments..

Usage

Usage info is available with the -h or --help flags.

# basic usage 
esmin input.js -o input.min.js
 
# to replace process.env.NODE_ENV with "production" add the `-p` flag 
esmin input.js -p -o input.min.js

Before and After

Here's an example that shows off what is currently implemented.

test.js

// hello world
 
var m = 3*5*6*8
 
var b = +"234"
 
var c = +"234" + 5
 
if ( 3*5*8 ? false : false ) {
  doSomething()
 
} else if (true) {
  thisOne()
} else {
  notHappening()
}
 
if ( (3*5?4:6) < 5) woot()
 
if (process.env.NODE_ENV !== "production") {
  debug()
}
 

test.min.js

var m=720;var b=234;var c=239;thisOne();woot();