refactor: remove unsupported Angular imports

[atscott]

Angular v13 removes the deprecated loadChildren: string syntax as well
as the supporting NgModuleFactoryLoader and SystemJsNgModuleLoader.
This commit simply removes those imports and providers. None of the
examples or tests appear to be using the loadChildren: string syntax.
In fact, the Ng2StateDeclaration.loadChildren does not even have
string as a valid type in ModuleTypeCallback.

See angular/angular@361273f

fixes #949

[kilatib]

Will you have a plan to merge that PR?

[kilatib]

I think package.json should be updated too for have the newest version there too

[mokipedia]

minimal change makes for a faster release.

would love to see this merged!

[atscott]

@kilatib, What @mokipedia said is the goal I was going for. I don't want to touch anything more than is absolutely necessary. These imports are leftover from old implementations and all we need to do is remove them to make everything happy.

[DOrlov77]

Hello, Angular 13 is here ;)
Do you plan to apply this fix?

[kilatib]

@atscott Do you know a way how I could hardly set the higher angular version in my package.json to avoid conflict version with that repo?

[KapilSachdev]

Hello @christopherthielen , What do you think about a new release with this change supporting Angular 13.

[DOrlov77]

Hello @antur84, may you please review the changes?

[antur84]

Tests are still green, LGTM

[antur84]

Hello @antur84, may you please review the changes?

Sure they look fine to me, tests are green. But I'm not in a position to merge & release this, I'm a humble consumer of the lib :)

[DOrlov77]

Ahh, sorry :)
This change is show-stopper to me to upgrade to Ng13, but, probably, it is a time switch to NgRouter...

[markhus-aurelius]

A merge of this would be so appreciated. We are blocked from upgrading to v13 currently

[timofei-iatsenko]

@wawyed @christopherthielen FYI

[christopherthielen]

I'll release a new version as soon as I can, thanks for the PR!

[timofei-iatsenko]

@christopherthielen i also willing to preapare PR with version bump and explicit support of ng13 + test

The ng13 introduced new way of distributing packages and it would be nice to build this library with actual versions of ng-packagr and angular compiler.

So it's probably would be better to wait for my PR and make release of all together

[KapilSachdev]

Hello @thekip, As pointed out by @mokipedia and the change made by @atscott, the idea behind this change was "minimal change makes for a faster release."
We should not delay the release any further as this is a blocker for many applications.
I think we should make this release in the current state and the changes you are mentioning can be added in the later releases.