diff --git a/src/Umbraco.Web.UI.Client/package.json b/src/Umbraco.Web.UI.Client/package.json
index f2c8269143..0a5589daa2 100644
--- a/src/Umbraco.Web.UI.Client/package.json
+++ b/src/Umbraco.Web.UI.Client/package.json
@@ -120,7 +120,6 @@
 		"./external/marked": "./dist-cms/external/marked/index.js",
 		"./external/monaco-editor": "./dist-cms/external/monaco-editor/index.js",
 		"./external/openid": "./dist-cms/external/openid/index.js",
-		"./external/router-slot": "./dist-cms/external/router-slot/index.js",
 		"./external/rxjs": "./dist-cms/external/rxjs/index.js",
 		"./external/tiptap": "./dist-cms/external/tiptap/index.js",
 		"./external/uui": "./dist-cms/external/uui/index.js"
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/modal/context/modal.context.ts b/src/Umbraco.Web.UI.Client/src/packages/core/modal/context/modal.context.ts
index c8af3838db..7280645d0a 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/modal/context/modal.context.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/modal/context/modal.context.ts
@@ -1,14 +1,13 @@
 import { UmbModalToken } from '../token/modal-token.js';
 import type { UmbModalConfig, UmbModalType } from '../types.js';
 import type { UmbControllerHost } from '@umbraco-cms/backoffice/controller-api';
-import type { IRouterSlot } from '@umbraco-cms/backoffice/external/router-slot';
 import type { UUIModalElement, UUIModalSidebarSize } from '@umbraco-cms/backoffice/external/uui';
 import { UmbId } from '@umbraco-cms/backoffice/id';
 import { UmbObjectState, UmbStringState } from '@umbraco-cms/backoffice/observable-api';
 import { UmbControllerBase } from '@umbraco-cms/backoffice/class-api';
 import { type UmbDeepPartialObject, umbDeepMerge } from '@umbraco-cms/backoffice/utils';
 import type { ElementLoaderProperty } from '@umbraco-cms/backoffice/extension-api';
-import { UMB_ROUTE_CONTEXT } from '@umbraco-cms/backoffice/router';
+import { UMB_ROUTE_CONTEXT, type IRouterSlot } from '@umbraco-cms/backoffice/router';
 
 export interface UmbModalRejectReason {
 	type: string;
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/route.context.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/route.context.ts
index 2bd561dbfb..c98ed9a764 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/route.context.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/route.context.ts
@@ -1,12 +1,12 @@
 import { umbGenerateRoutePathBuilder } from '../../generate-route-path-builder.function.js';
 import type { UmbModalRouteRegistration } from '../../modal-registration/modal-route-registration.interface.js';
 import type { UmbRoute } from './route.interface.js';
-import type { IRouterSlot } from '@umbraco-cms/backoffice/external/router-slot';
 import { UmbContextToken } from '@umbraco-cms/backoffice/context-api';
 import type { UmbControllerHost } from '@umbraco-cms/backoffice/controller-api';
 import { UmbContextBase } from '@umbraco-cms/backoffice/class-api';
 import { UMB_MODAL_MANAGER_CONTEXT } from '@umbraco-cms/backoffice/modal';
 import { UmbStringState, mergeObservables } from '@umbraco-cms/backoffice/observable-api';
+import type { IRouterSlot } from '../../router-slot/index.js';
 
 const EmptyDiv = document.createElement('div');
 
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/route.interface.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/route.interface.ts
index 71ffa95728..235df6c9f6 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/route.interface.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/route.interface.ts
@@ -1 +1 @@
-export type { IRoute as UmbRoute } from '@umbraco-cms/backoffice/external/router-slot';
+export type { IRoute as UmbRoute } from '../../router-slot/index.js';
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/router-slot.element.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/router-slot.element.ts
index 291e8cd119..77f9d94d84 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/router-slot.element.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/components/router-slot/router-slot.element.ts
@@ -1,4 +1,3 @@
-import '@umbraco-cms/backoffice/external/router-slot';
 import { UmbRoutePathAddendumResetContext } from '../../contexts/route-path-addendum-reset.context.js';
 import { UmbRouterSlotInitEvent } from './router-slot-init.event.js';
 import { UmbRouterSlotChangeEvent } from './router-slot-change.event.js';
@@ -6,7 +5,7 @@ import type { UmbRoute } from './route.interface.js';
 import { UmbRouteContext } from './route.context.js';
 import { css, html, type PropertyValueMap, customElement, property } from '@umbraco-cms/backoffice/external/lit';
 import { UmbLitElement } from '@umbraco-cms/backoffice/lit-element';
-import type { IRouterSlot } from '@umbraco-cms/backoffice/external/router-slot';
+import type { IRouterSlot } from '../../router-slot/index.js';
 
 /**
  *  @element umb-router-slot
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/router/generate-route-path-builder.function.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/generate-route-path-builder.function.ts
index c7199cc42d..440b23e3e8 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/router/generate-route-path-builder.function.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/generate-route-path-builder.function.ts
@@ -1,5 +1,5 @@
-import { type UrlParametersRecord, umbUrlPatternToString } from '../utils/path/url-pattern-to-string.function.js';
-import { stripSlash } from '@umbraco-cms/backoffice/external/router-slot'; // This must only include the util to avoid side effects of registering the route element.
+import { umbUrlPatternToString, type UrlParametersRecord } from '@umbraco-cms/backoffice/utils';
+import { stripSlash } from './router-slot/util.js';
 
 /**
  *
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/router/index.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/index.ts
index 73587fb136..de29580c1d 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/router/index.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/index.ts
@@ -4,6 +4,6 @@ export * from './contexts/index.js';
 export * from './encode-folder-name.function.js';
 export * from './modal-registration/modal-route-registration.controller.js';
 export * from './path-pattern.class.js';
-export * from '@umbraco-cms/backoffice/external/router-slot';
+export * from './router-slot/index.js';
 export type * from './modal-registration/modal-route-registration.interface.js';
 export type * from './types.js';
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/router/modal-registration/modal-route-registration.controller.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/modal-registration/modal-route-registration.controller.ts
index 23a7100013..b5e66c4a27 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/router/modal-registration/modal-route-registration.controller.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/modal-registration/modal-route-registration.controller.ts
@@ -1,4 +1,5 @@
 import { UMB_ROUTE_CONTEXT, UMB_ROUTE_PATH_ADDENDUM_CONTEXT } from '../index.js';
+import type { IRouterSlot, Params } from '../router-slot/index.js';
 import { encodeFolderName } from '../encode-folder-name.function.js';
 import type { UmbModalRouteRegistration } from './modal-route-registration.interface.js';
 import type {
@@ -12,7 +13,6 @@ import type { UmbControllerAlias, UmbControllerHost } from '@umbraco-cms/backoff
 import { UmbControllerBase } from '@umbraco-cms/backoffice/class-api';
 import { UmbId } from '@umbraco-cms/backoffice/id';
 import type { UmbDeepPartialObject } from '@umbraco-cms/backoffice/utils';
-import type { IRouterSlot, Params } from '@umbraco-cms/backoffice/external/router-slot';
 
 export type UmbModalRouteBuilder = (params: { [key: string]: string | number } | null) => string;
 
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/router/modal-registration/modal-route-registration.interface.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/modal-registration/modal-route-registration.interface.ts
index 1f9b84f02c..df8b77a555 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/router/modal-registration/modal-route-registration.interface.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/modal-registration/modal-route-registration.interface.ts
@@ -1,5 +1,5 @@
+import type { IRouterSlot, Params } from '../router-slot/index.js';
 import type { UmbModalRouteBuilder } from './modal-route-registration.controller.js';
-import type { IRouterSlot, Params } from '@umbraco-cms/backoffice/external/router-slot';
 import type { UmbModalContext, UmbModalManagerContext, UmbModalToken } from '@umbraco-cms/backoffice/modal';
 
 export interface UmbModalRouteRegistration<
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/LICENSE.md b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/LICENSE.md
similarity index 100%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/LICENSE.md
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/LICENSE.md
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/config.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/config.ts
similarity index 86%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/config.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/config.ts
index e587ba2c4b..9d1a16a76d 100644
--- a/src/Umbraco.Web.UI.Client/src/external/router-slot/config.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/config.ts
@@ -1,5 +1,6 @@
 import type { PathMatch } from './model.js';
 
+/* eslint-disable local-rules/exported-string-constant-naming */
 export const CATCH_ALL_WILDCARD: string = '**';
 export const TRAVERSE_FLAG: string = '\\.\\.\\/';
 export const PARAM_IDENTIFIER: RegExp = /:([^\\/]+)/g;
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/index.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/index.ts
similarity index 100%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/index.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/index.ts
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/model.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/model.ts
similarity index 98%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/model.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/model.ts
index 6872b18149..45e942b52e 100644
--- a/src/Umbraco.Web.UI.Client/src/external/router-slot/model.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/model.ts
@@ -18,6 +18,7 @@ export type IRoutingInfo<D = any, P = any> = {
 	match: IRouteMatch<D>;
 };
 
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
 export type CustomResolver<D = any, P = any> = (
 	info: IRoutingInfo<D>,
 ) => boolean | void | Promise<boolean> | Promise<void>;
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/router-slot.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/router-slot.ts
similarity index 99%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/router-slot.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/router-slot.ts
index 007c8d6c32..571a63b15d 100644
--- a/src/Umbraco.Web.UI.Client/src/external/router-slot/router-slot.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/router-slot.ts
@@ -44,6 +44,7 @@ ensureAnchorHistory();
  * @slot - Default content.
  * @event changestate - Dispatched when the router slot state changes.
  */
+// eslint-disable-next-line local-rules/enforce-element-suffix-on-element-class-name, local-rules/umb-class-prefix
 export class RouterSlot<D = any, P = any> extends HTMLElement implements IRouterSlot<D, P> {
 	/**
 	 * Method to cancel navigation if changed.
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/util.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util.ts
similarity index 100%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/util.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util.ts
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/anchor.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/anchor.ts
similarity index 100%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/util/anchor.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/anchor.ts
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/events.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/events.ts
similarity index 97%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/util/events.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/events.ts
index 1a5d1816f6..905df0c8ac 100644
--- a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/events.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/events.ts
@@ -1,5 +1,5 @@
 import { GLOBAL_ROUTER_EVENTS_TARGET } from '../config.js';
-import type { EventListenerSubscription, GlobalRouterEvent, IRoute, IRoutingInfo } from '../model.js';
+import type { EventListenerSubscription, GlobalRouterEvent, IRoutingInfo } from '../model.js';
 
 /**
  * Dispatches a did change route event.
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/history.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/history.ts
similarity index 100%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/util/history.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/history.ts
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/index.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/index.ts
similarity index 100%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/util/index.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/index.ts
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/router.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/router.ts
similarity index 98%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/util/router.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/router.ts
index 7c731abe59..a29de89ed4 100644
--- a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/router.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/router.ts
@@ -1,3 +1,4 @@
+/* eslint-disable no-useless-escape */
 import { CATCH_ALL_WILDCARD, DEFAULT_PATH_MATCH, PARAM_IDENTIFIER, TRAVERSE_FLAG } from '../config.js';
 import type {
 	IComponentRoute,
@@ -131,6 +132,7 @@ export async function resolvePageComponent(route: IComponentRoute, info: IRoutin
 	let cmp = route.component;
 	if (cmp instanceof Function) {
 		try {
+			// eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
 			cmp = (cmp as Function)();
 		} catch (err) {
 			// The invocation most likely failed because the function is a class.
@@ -188,7 +190,7 @@ export function isResolverRoute(route: IRoute): route is IResolverRoute {
  */
 export function traverseRouterTree(slot: IRouterSlot): { tree: RouterTree; depth: number } {
 	// Find the nodes from the route up to the root route
-	let routes: IRouterSlot[] = [slot];
+	const routes: IRouterSlot[] = [slot];
 	while (slot.parent != null) {
 		slot = slot.parent;
 		routes.push(slot);
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/shadow.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/shadow.ts
similarity index 100%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/util/shadow.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/shadow.ts
diff --git a/src/Umbraco.Web.UI.Client/src/external/router-slot/util/url.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/url.ts
similarity index 100%
rename from src/Umbraco.Web.UI.Client/src/external/router-slot/util/url.ts
rename to src/Umbraco.Web.UI.Client/src/packages/core/router/router-slot/util/url.ts
diff --git a/src/Umbraco.Web.UI.Client/src/packages/core/router/types.ts b/src/Umbraco.Web.UI.Client/src/packages/core/router/types.ts
index 6fcea8d459..9a52bbf13b 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/core/router/types.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/core/router/types.ts
@@ -1,5 +1,5 @@
-import type { IRoutingInfo, PageComponent } from '@umbraco-cms/backoffice/external/router-slot';
 import type { UmbApi } from '@umbraco-cms/backoffice/extension-api';
+import type { IRoutingInfo, PageComponent } from './router-slot/index.js';
 
 export interface UmbRouteEntry extends UmbApi {
 	getPath?(): string;
diff --git a/src/Umbraco.Web.UI.Client/tsconfig.json b/src/Umbraco.Web.UI.Client/tsconfig.json
index 870cc277c4..1cb4055f7c 100644
--- a/src/Umbraco.Web.UI.Client/tsconfig.json
+++ b/src/Umbraco.Web.UI.Client/tsconfig.json
@@ -149,7 +149,6 @@ DON'T EDIT THIS FILE DIRECTLY. It is generated by /devops/tsconfig/index.js
 			"@umbraco-cms/backoffice/external/marked": ["./src/external/marked/index.ts"],
 			"@umbraco-cms/backoffice/external/monaco-editor": ["./src/external/monaco-editor/index.ts"],
 			"@umbraco-cms/backoffice/external/openid": ["./src/external/openid/index.ts"],
-			"@umbraco-cms/backoffice/external/router-slot": ["./src/external/router-slot/index.ts"],
 			"@umbraco-cms/backoffice/external/rxjs": ["./src/external/rxjs/index.ts"],
 			"@umbraco-cms/backoffice/external/tiptap": ["./src/external/tiptap/index.ts"],
 			"@umbraco-cms/backoffice/external/uui": ["./src/external/uui/index.ts"]