Eject to custom webpack configuration file #6731

Bug Report or Feature Request (mark with an x)

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

Versions.

@angular/cli: 1.1.2 (e)
node: 6.9.5
os: win32 x64
@angular/common: 4.2.3
@angular/compiler: 4.2.3
@angular/core: 4.2.3
@angular/forms: 4.2.3
@angular/http: 4.2.3
@angular/platform-browser: 4.2.3
@angular/platform-browser-dynamic: 4.2.3
@angular/router: 4.2.3
@angular/cli: 1.1.2
@angular/compiler-cli: 4.2.3

Repro steps.

The log given by the failure.

Desired functionality.

I maintain different webpack configuration files for the needs of my project (2 for development and 2 for production). One of the development files is the default webpack.config.js which I use to merge changes back to the remaining ones, when a new version of CLI is released. That is, I run ng eject each time to apply the changes in the default config, inspect those changes and apply them to the other files by hand. I follow this process in order not to mess up my custom configuration in the webpack configuration files. It would be really handy, if I could define the target config file of the eject command such as: ng eject --config=<the config file> and have the changes directly applied to the configuration files.

Mention any other details that might be useful.