When running the following command:

echo "let demo = 3; console.log(demo);" | uglifyjs --compress --mangle

I would expect the following output:

let a=3;console.log(a);

Instead, I get:

let demo=3;console.log(demo);

Therefore, I don't understand how I should use --mangle option. The official documentation explains how to exclude the names which shouldn't be mangled, how to mangle properties, etc., but how do I just transform the names of ordinary variables?

Or is this option doing something completely different, and I misunderstood its purpose?

Note: I'm using uglify-es 3.2.2.

When running the following command:

echo "let demo = 3; console.log(demo);" | uglifyjs --compress --mangle

I would expect the following output:

let a=3;console.log(a);

Instead, I get:

let demo=3;console.log(demo);

Therefore, I don't understand how I should use --mangle option. The official documentation explains how to exclude the names which shouldn't be mangled, how to mangle properties, etc., but how do I just transform the names of ordinary variables?

Or is this option doing something completely different, and I misunderstood its purpose?

Note: I'm using uglify-es 3.2.2.

• javascript
• minify
• uglifyjs

• did you try "uglifyjs --compress --mangle --toplevel" ? should mangle everything in the top level scope – MercyDude Commented Dec 29, 2017 at 17:23
• 2 @MercyDude: nice! Please, post it as an answer so I can accept it. – Arseni Mourzenko Commented Dec 29, 2017 at 17:36

1 Answer 1

So I looked at The official documentation, and as you said --mangle is the option where you choose what not to mangle (how convenient), and figured out that you should use --toplevel which mangle everything in the top level scope.

Eventually it should look like that:

uglifyjs --compress --mangle --toplevel