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Configures how the Router attempts to restore state when a navigation is cancelled.

'replace' - Always uses location.replaceState to set the browser state to the state of the router before the navigation started. This means that if the URL of the browser is updated before the navigation is canceled, the Router will simply replace the item in history rather than trying to restore to the previous location in the session history. This happens most frequently with urlUpdateStrategy: 'eager' and navigations with the browser back/forward buttons.

'computed' - Will attempt to return to the same index in the session history that corresponds to the Angular route when the navigation gets cancelled. For example, if the browser back button is clicked and the navigation is cancelled, the Router will trigger a forward navigation and vice versa.

Note: the 'computed' option is incompatible with any UrlHandlingStrategy which only handles a portion of the URL because the history restoration navigates to the previous place in the browser history rather than simply resetting a portion of the URL.

The default value is replace when not set.

Configures the default for handling a navigation request to the current URL.

If unset, the Router will use 'ignore'.

Defines how the router merges parameters, data, and resolved data from parent to child routes.

By default ('always'), a route inherits all parameters from its parent routes.

Set to 'emptyOnly' to preserve the legacy behavior where a route only inherits the parent route's parameters when the route itself has an empty path or when the parent route doesn't have any component set.

Note that when dealing with matrix parameters, "parent" refers to the parent Route config which does not necessarily mean the "URL segment to the left". When the Route path contains multiple segments, the matrix parameters must appear on the last segment. For example, matrix parameters for {path: 'a/b', component: MyComp} should appear as a/b;foo=bar and not a;foo=bar/b.

Defines when the router updates the browser URL. By default ('deferred'), update after successful navigation. Set to 'eager' if prefer to update the URL at the beginning of navigation. Updating the URL early allows you to handle a failure of navigation by showing an error message with the URL that failed.

The default strategy to use for handling query params in Router.createUrlTree when one is not provided.

The createUrlTree method is used internally by Router.navigate and RouterLink. Note that QueryParamsHandling does not apply to Router.navigateByUrl.

When neither the default nor the queryParamsHandling option is specified in the call to createUrlTree, the current parameters will be replaced by new parameters.

When true, the Promise will instead resolve with false, as it does with other failed navigations (for example, when guards are rejected).

Otherwise the Promise returned by the Router's navigation with be rejected if an error occurs.