Build and Serve should account for module polyfills

[AlexAegis]

🚀 Feature request

Command (mark with an x)

- [ ] new
- [X] build
- [X] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Description

I made a polyfill to extend a feature of a node module (RxJS, I added a setter to make a readonly value writable). When manually editing the source of RxJS inside node_modules the polyfill works as expected. However when building the project (--prod --aot), or serving with a clean and fresh node_modules folder, the angular CLI doesn't take my modifications into account and thinks that I'm trying to use something that's not there.

Describe the solution you'd like

Use the polyfills.ts when serving and building the project

Describe alternatives you've considered

Not using the polyfill.

This is the polyfill in question:

import { BehaviorSubject } from 'rxjs';
Object.defineProperty(BehaviorSubject.prototype, 'value', {
	set: function(v) {
		return this.next(v);
	}
});

And the error is thrown where i'm trying to use it in a template file:

[(value)]="myBehaviorSubject.value"

[alan-agius4]

Hello, we reviewed this issue and determined that it doesn't fall into the bug report or feature request category. This issue tracker is not suitable for support requests, please repost your issue on StackOverflow using tag angular-cli.

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