ng build help shows incorrect flag options

[jasonswett]

Please provide us with the following information:

1. OS? Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
   Max OS X, although I imagine that's not relevant.
2. Versions. Please run ng --version. If there's nothing outputted, please run
   in a Terminal: node --version and paste the result here:
   1.0.0-beta.11-webpack.8
3. Repro steps. Was this an app that wasn't created using the CLI? What change did you
   do on your code? etc.

If you run ng build --help, you see as one option:

 --environment (String) (Default: development)
    aliases: -e <value>, -dev (--environment=development), -prod (--environment=production)

If you then run this
ng build --environment=production

you get "Path must be a string. Received undefined".

If you do ng build --environment=prod, it works. I'm assuming this is because there's an src/environments/environment.prod.ts file but not src/environments/environment.production.ts.

Seems like the help output should be corrected and you should get a friendlier error if you provide a bogus environment value.

1. The log given by the failure. Normally this include a stack trace and some
   more information.

Path must be a string. Received undefined
TypeError: Path must be a string. Received undefined
    at assertPath (path.js:7:11)
    at Object.resolve (path.js:1148:7)
    at Object.getWebpackCommonConfig (/Users/jasonswett/projects/scratch/foo/node_modules/angular-cli/addon/ng2/models/webpack-build-common.ts:128:80)
    at new NgCliWebpackConfig (/Users/jasonswett/projects/scratch/foo/node_modules/angular-cli/addon/ng2/models/webpack-config.ts:13:30)
    at Class.run (/Users/jasonswett/projects/scratch/foo/node_modules/angular-cli/addon/ng2/tasks/build-webpack.ts:16:22)
    at Class.run (/Users/jasonswett/projects/scratch/foo/node_modules/angular-cli/addon/ng2/commands/build.ts:49:26)
    at Class.<anonymous> (/Users/jasonswett/projects/scratch/foo/node_modules/angular-cli/lib/models/command.js:152:17)
    at lib$rsvp$$internal$$tryCatch (/Users/jasonswett/projects/scratch/foo/node_modules/rsvp/dist/rsvp.js:1036:16)
    at lib$rsvp$$internal$$invokeCallback (/Users/jasonswett/projects/scratch/foo/node_modules/rsvp/dist/rsvp.js:1048:17)
    at lib$rsvp$$internal$$publish (/Users/jasonswett/projects/scratch/foo/node_modules/rsvp/dist/rsvp.js:1019:11)
    at lib$rsvp$asap$$flush (/Users/jasonswett/projects/scratch/foo/node_modules/rsvp/dist/rsvp.js:1198:9)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)

1. Mention any other details that might be useful.

---

Thanks! We'll be in touch soon.

[filipesilva]

Fixed by #2041 and latest (beta.15) release. Also see https://github.com/angular/angular-cli#webpack-update regarding changes in environments and upgrade path.

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