Bug Report or Feature Request (mark with an x)

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

Versions.

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Repro steps.

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The log given by the failure.

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Desired functionality.

We frequently add environment variables to the environment.ts file ... surprise!. We use the standard development and production builds but either can be deployed to any number of sites: Company A host, Company B host... and each host may have its own environment settings.

Mention any other details that might be useful.

Each site has its own environment settings (for example each site may point to a different host for API calls). Since the environment files are bundled we either have to rebuild and specify another environment file for each build (not going to do that) or perform variable substitutions on bundle files (holding our noses and doing that). The environment files should be loose (not bundled) so tools like Ansible or your own shell scripts can more safely and efficiently change the values as part of the deployment.