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    NavItemBlueprint: ExtensionBlueprint<
        {
            config: {};
            configInput: {};
            dataRefs: {
                target: ConfigurableExtensionDataRef<
                    { icon: IconComponent; routeRef: RouteRef<undefined>; title: string },
                    "core.nav-item.target",
                    {},
                >;
            };
            inputs: {};
            kind: "nav-item";
            output: ExtensionDataRef<
                { icon: IconComponent; routeRef: RouteRef<undefined>; title: string },
                "core.nav-item.target",
                {},
            >;
            params: {
                icon: IconComponent;
                routeRef: RouteRef<undefined>;
                title: string;
            };
        },
    > = ...

    Creates extensions that make up the items of the nav bar.