#### Note:
- **`uglify-js@3.x` has a new API and CLI and is not backwards compatible with [`uglify-js@2.x`](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
- **Documentation for UglifyJS `2.x` releases can be found [here](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
-- Release versions of `uglify-js` only support ECMAScript 5 (ES5). If you wish to minify
-ES2015+ (ES6+) code then please use the [harmony](#harmony) development branch.
-- Node 7 has a known performance regression and runs `uglify-js` twice as slow.
+- Release versions of `uglify-js` only support ECMAScript 5 (ES5).
+- Those wishing to minify
+ES2015+ (ES6+) should use the `npm` package [**uglify-es**](https://github.com/mishoo/UglifyJS2/tree/harmony).
Install
-------
[acorn]: https://github.com/ternjs/acorn
[sm-spec]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k
-
-#### Harmony
-
-If you wish to use the experimental [harmony](https://github.com/mishoo/UglifyJS2/commits/harmony)
-branch to minify ES2015+ (ES6+) code please use the following in your `package.json` file:
-
-```
-"uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony"
-```
-
-or to directly install the experimental harmony version of uglify:
-
-```
-npm install --save-dev uglify-js@github:mishoo/UglifyJS2#harmony
-```
-
-See [#448](https://github.com/mishoo/UglifyJS2/issues/448) for additional details.