using uglify-webpack-plugin version 1.0.0-beta with uglify-es

[osadan]

Bug Report or Feature Request (mark with an x)

- [ x] bug report -> please search issues before submitting
- [ x] feature request

Versions.

ng version - 1.2.1 ( latest)

Repro steps.

II tried to use uglify-es (changed the version in webapck package.json) (wanting to compile my code to es6) I used uglify-webpack-plugin version 1.0.0.beta
and I figured that the options coming from the ng build (on models/webpack-config.ts)

 public addTargetDefaults(buildOptions: BuildOptions): BuildOptions {

is reaching to the uglify-webpack-plugin function as

options:{ 
//datahere
} 

and the uglify-webpack-plugin is expected the options to be

this.uglifyOptions = this.options.uglifyOptions

[filipesilva]

Heya, I'm consolidating all the ES2015 support requests on the same issue, so it can be better actioned on.

Duplicate of #2907.

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