Can uglify-js remove the console.log statements?

I'm using [uglify-js][1] to minify the source code. I want to remove the console.log statements of the original source code. Is it possible? Or is there any other compressor tool supports this?

I use the code as below in Node.js.

var uglify = require('uglify-js');
var originalSourceCode = 'var name = function(){var str = "test"; return str}; console.log("log data");';
var minifiedCode = uglify.minify(originalSourceCode, {
fromString : true,
mangle: {},
warnings: true
});
console.log(minifiedCode);

The output is:

$node m.js
{ code: 'var name=function(){var a="test";return a};console.log("log data");',
map: 'null' }

In the minified code the console.log isn't removed.

[1]:

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You can use [Groundskeeper][1] to do this though it will be a separate step.


[1]:

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In the lastest uglify-js ( v2.4.3), a new compress option ‘pure_funcs’ is added. If I add the console.log functions to this array, it will be removed in the minified js file. The test code below shows how this option works. This is exactly what I want.

// file: m.js
var uglify = require('uglify-js');
var originalSourceCode = 'var name = function(){var str = "test"; return str}; console.log("log data" + name());';
var minifiedCode = uglify.minify(originalSourceCode, {
fromString : true,
mangle: {},
warnings: true,
compress:{
pure_funcs: [ 'console.log' ]
}
});
console.log(minifiedCode);

$node m.js
WARN: Dropping side-effect-free statement [?:1,53]
{ code: 'var name=function(){var n="test";return n};',
map: 'null' }

Quotes from

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> pure_funcs -- default null. You can pass an array of names and UglifyJS will assume that those functions do not produce side effects.
> DANGER: will not check if the name is redefined in scope. An example
> case here, for instance var q = Math.floor(a/b). If variable q is not
> used elsewhere, UglifyJS will drop it, but will still keep the
> Math.floor(a/b), not knowing what it does. You can pass pure_funcs: [
> 'Math.floor' ] to let it know that this function won't produce any
> side effect, in which case the whole statement would get discarded.
> The current implementation adds some overhead (compression will be
> slower).

There's also another option called drop_console which has been added recently (late 2013)

drop_console -- default false. Pass true to discard calls to console.* functions

This is added to the grunt init config like this:

grunt.initConfig({
uglify: {
options: {
compress: {
drop_console: true // <-
}
},
my_target: {
files: {
'dest/output.min.js': ['src/input.js']
}
}
}
});

As taken from the [grunt-contrib-uglify github documents][1]


[1]:

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for **-c** option, set **drop_console** to be **true**:
```
uglifyjs app.js -m -c drop_console=true -o app.min.js
```

If you are using gulp, use 'gulp-strip-debug' to remove console, alert and debugger.

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