Hook into router config loading

🚀 feature request

Relevant Package

This feature request is for @angular/router

Description

Router.resetConfig allows you to basically post process router at application startup - e.g. replace static placeholders, translate urls, mass add route data etc.). However you don’t get a chance to do this for lazy loaded components.

Describe the solution you’d like

Add some possibility to hook into the RouterConfigLoader when routes from the child modules are processed (e.g. a provider that would be called with the routes resolved from the just loaded module’s injector - https://github.com/angular/angular/blob/master/packages/router/src/router_config_loader.ts#L43).

Describe alternatives you’ve considered

The way to get around this is implemented in localized-router: https://github.com/Greentube/localize-router/blob/master/src/localize-router-config-loader.ts. This is a hack in the first place and will not work with the new loadChildren syntax.

The solution which would support also the new syntax is here: https://github.com/gilsdav/ngx-translate-router/blob/master/projects/ngx-translate-router/src/lib/localized-router.ts which is an even bigger hack.

/cc @gilsdav @meeroslav Pls comment if you have any thoughts on this.

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[meeroslav]

I would like to see a clean way to intercept the routes on lazy loading.

While I don’t consider the localize-router solution with overriding a System JS Loader a hack, it was clearly not future proof (although at that time best solution as discussed with @vsavkin).

Linking the previous feature request here: https://github.com/angular/angular/issues/16282 as well as https://github.com/angular/angular/issues/14036