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A broccoli filter that applies uglify-js while properly generating or
maintaining sourcemaps.

### installation

```sh
npm install --save broccoli-uglify-sourcemap
```

### usage

```js
var uglify = require('broccoli-uglify-sourcemap');

// basic usage
var uglified = uglify(input);

// advanced usage
var uglified = uglify(input, {
  exclude: [..], // array of globs, to not minify
  
  uglify: {
    mangle: false,    // defaults to true
    compress: false,  // defaults to true
    sourceMap: false, // defaults to true
    //...
  }
});
```