ng build -prod FAILS with UglifyJs error when targeting ES2015!!

[tx8821]

Bug Report or Feature Request (mark with an x)

- [X] bug report
- [ ] feature request

Versions.

Project 1: @angular/cli: 1.1.3
Project 2: @angular/cli: 1.3.0-rc.1

node: 7.10.0
os: win32 x64

In tsconfig.json: "target": "es2015"

Repro steps.

Create new app. Target tsconfig to ES2015. Build with -prod flag. Get the errors.

The log given by the failure.

ERROR in main.d3a567e3e4474c9592a2.bundle.js from UglifyJs
Unexpected token: name (AppModule) [main.d3a567e3e4474c9592a2.bundle.js:23,6]

Mention any other details that might be useful.

When I set ES2015 as target in my tsconfig, I can't use -prod flag anymore! Getting UglifyJs errors!
My limited research concludes that Uglify cannot parse ES6, link here: webpack/webpack#2972 (comment)

I need -prod flag, and I need to target ES2015. Am I missing something?

[siemato]

As far as I know UglifyJS does not support es2015.

This is a statement from the UglifyJS Readme:

Those wishing to minify ES2015+ (ES6+) should use the npm package uglify-es.

[coryrylan]

What @siedentm said is correct. Currently the CLI does not support ES2015 as an option when compiling modules I believe. The CLI would have to adjust the uglify plugin dependent on the module type set in the TSConfig.

[filipesilva]

Duplicate of #2907

[hiepxanh]

hello, I upgrade to angular 5 beta 4 and still get errror Unexpected token: name (AppModule), what should i do ?

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