Observer Pattern

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[ ] feature request
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Current behavior

I want to implement a Observer Pattern between lazy loaded modules. And I don’t know is it possible or not

Expected behavior

If it is please help. Even a doc part for read will be very good

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Angular version: 4.0.3

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

• Language: [all | TypeScript 2.2 | ES6/7 | ES5]

• Node (for AoT issues): node --version = 7.9.0

[Artur93gev]

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