SwPush breaks Angular on Safari - undefined is not an object (evaluating 'source.lift')

[maciejtreder]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior

When SwPush is injected in any service/component Safari complains with:

TypeError: undefined is not an object (evaluating 'source.lift') - map.js:46

Expected behavior

SwPush should not break Safari build (ie code should be ignored when service worker is not available)

Minimal reproduction of the problem with instructions

Inject SwPush into service/component.

Online example:
https://www.angular-universal-pwa.maciejtreder.com

github repo:
https://github.com/maciejtreder/angular-universal-pwa

Environment

Angular version: 5.0.0
rxjs: 5.5.2


Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [x] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: 8.5.0  
- Platform: Mac 

[maciejtreder]

Warkaround can be found in my Angular PWA starter:
https://github.com/maciejtreder/angular-universal-pwa
https://github.com/maciejtreder/angular-universal-pwa/pull/68/files#diff-ce9cfd30bd8965cf7bf8754af08e4825R21-R27

    private swPush: SwPush;

    constructor(private injector: Injector) {
        try {
            this.swPush = this.injector.get(SwPush);
        } catch (error) {
            // workaround for https://github.com/angular/angular/issues/20407
        }
    }

[alxhub]

Fixed by 7cabaa0

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