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{ DOM, PLATFORM } from 'aurelia-pal';\nimport { BrowserHistory } from './browser-history';\nimport { AnchorEventInfo } from './interfaces';\n\n/**\n * Class responsible for handling interactions that should trigger browser history navigations.\n */\nexport class LinkHandler {\n  /**\n   * Activate the instance.\n   *\n   * @param history The BrowserHistory instance that navigations should be dispatched to.\n   */\n  activate(history: BrowserHistory): void {/**/}\n\n  /**\n   * Deactivate the instance. Event handlers and other resources should be cleaned up here.\n   */\n  deactivate(): void {/**/}\n}\n\n/**\n * The default LinkHandler implementation. Navigations are triggered by click events on\n * anchor elements with relative hrefs when the history instance is using pushstate.\n */\nexport class DefaultLinkHandler extends LinkHandler {\n\n  /**@internal */\n  handler: (e: Event) => void;\n\n  /**@internal */\n  history: BrowserHistory;\n  /**\n   * Creates an instance of DefaultLinkHandler.\n   */\n  constructor() {\n    super();\n\n    this.handler = (e) => {\n      let { shouldHandleEvent, href } = DefaultLinkHandler.getEventInfo(e);\n\n      if (shouldHandleEvent) {\n        e.preventDefault();\n        this.history.navigate(href);\n      }\n    };\n  }\n\n  /**\n   * Activate the instance.\n   *\n   * @param history The BrowserHistory instance that navigations should be dispatched to.\n   */\n  activate(history: BrowserHistory): void {\n    if (history._hasPushState) {\n      this.history = history;\n      DOM.addEventListener('click', this.handler, true);\n    }\n  }\n\n  /**\n   * Deactivate the instance. Event handlers and other resources should be cleaned up here.\n   */\n  deactivate(): void {\n    DOM.removeEventListener('click', this.handler, true);\n  }\n\n  /**\n   * Gets the href and a \"should handle\" recommendation, given an Event.\n   *\n   * @param event The Event to inspect for target anchor and href.\n   */\n  static getEventInfo(event: Event): AnchorEventInfo {\n    let $event = event as MouseEvent;\n    let info = {\n      shouldHandleEvent: false,\n      href: null,\n      anchor: null\n    };\n\n    let target = DefaultLinkHandler.findClosestAnchor($event.target as Element);\n    if (!target || !DefaultLinkHandler.targetIsThisWindow(target)) {\n      return info;\n    }\n\n    if (hasAttribute(target, 'download')\n      || hasAttribute(target, 'router-ignore')\n      || hasAttribute(target, 'data-router-ignore')\n    ) {\n      return info;\n    }\n\n    if ($event.altKey || $event.ctrlKey || $event.metaKey || $event.shiftKey) {\n      return info;\n    }\n\n    let href = target.getAttribute('href');\n    info.anchor = target;\n    info.href = href;\n\n    let leftButtonClicked = $event.which === 1;\n    let isRelative = href && !(href.charAt(0) === '#' || (/^[a-z]+:/i).test(href));\n\n    info.shouldHandleEvent = leftButtonClicked && isRelative;\n    return info;\n  }\n\n  /**\n   * Finds the closest ancestor that's an anchor element.\n   *\n   * @param el The element to search upward from.\n   * @returns The link element that is the closest ancestor.\n   */\n  static findClosestAnchor(el: Element): Element {\n    while (el) {\n      if (el.tagName === 'A') {\n        return el;\n      }\n\n      el = el.parentNode as Element;\n    }\n  }\n\n  /**\n   * Gets a value indicating whether or not an anchor targets the current window.\n   *\n   * @param target The anchor element whose target should be inspected.\n   * @returns True if the target of the link element is this window; false otherwise.\n   */\n  static targetIsThisWindow(target: Element): boolean {\n    let targetWindow = target.getAttribute('target');\n    let win = PLATFORM.global;\n\n    return !targetWindow ||\n      targetWindow === win.name ||\n      targetWindow === '_self';\n  }\n}\n\nconst hasAttribute = (el: Element, attr: string) => el.hasAttribute(attr);\n","import { DOM, PLATFORM } from 'aurelia-pal';\nimport { LinkHandler } from './link-handler';\nimport { History } from 'aurelia-history';\n\n/**\n * An implementation of the basic history API.\n */\nexport class BrowserHistory extends History {\n  /**@internal */\n  static inject = [LinkHandler];\n\n  /**@internal */\n  _isActive: boolean;\n\n  /**@internal*/\n  _checkUrlCallback: any;\n  /**@internal*/\n  location: Location;\n  /**@internal*/\n  history: typeof PLATFORM['history'];\n  /**@internal*/\n  linkHandler: LinkHandler;\n  /**@internal*/\n  options: any;\n  /**@internal*/\n  root: string;\n  /**@internal*/\n  _wantsHashChange: boolean;\n  /**@internal*/\n  _hasPushState: boolean;\n  /**@internal*/\n  fragment: string;\n\n  /**\n   * Creates an instance of BrowserHistory\n   * @param linkHandler An instance of LinkHandler.\n   */\n  constructor(linkHandler: LinkHandler) {\n    super();\n\n    this._isActive = false;\n    this._checkUrlCallback = this._checkUrl.bind(this);\n\n    this.location = PLATFORM.location;\n    this.history = PLATFORM.history;\n    this.linkHandler = linkHandler;\n  }\n\n  /**\n   * Activates the history object.\n   * @param options The set of options to activate history with.\n   * @returns Whether or not activation occurred.\n   */\n  activate(options?: Object): boolean {\n    if (this._isActive) {\n      throw new Error('History has already been activated.');\n    }\n\n    let $history = this.history;\n    let wantsPushState = !!(options as any).pushState;\n\n    this._isActive = true;\n    let normalizedOptions = this.options = Object.assign({}, { root: '/' }, this.options, options);\n\n    // Normalize root to always include a leading and trailing slash.\n    let rootUrl = this.root = ('/' + normalizedOptions.root + '/').replace(rootStripper, '/');\n\n    let wantsHashChange = this._wantsHashChange = normalizedOptions.hashChange !== false;\n    let hasPushState = this._hasPushState = !!(normalizedOptions.pushState && $history && $history.pushState);\n\n    // Determine how we check the URL state.\n    let eventName: string;\n    if (hasPushState) {\n      eventName = 'popstate';\n    } else if (wantsHashChange) {\n      eventName = 'hashchange';\n    }\n\n    PLATFORM.addEventListener(eventName, this._checkUrlCallback);\n\n    // Determine if we need to change the base url, for a pushState link\n    // opened by a non-pushState browser.\n    if (wantsHashChange && wantsPushState) {\n      // Transition from hashChange to pushState or vice versa if both are requested.\n      let $location = this.location;\n      let atRoot = $location.pathname.replace(/[^\\/]$/, '$&/') === rootUrl;\n\n      // If we've started off with a route from a `pushState`-enabled\n      // browser, but we're currently in a browser that doesn't support it...\n      if (!hasPushState && !atRoot) {\n        let fragment =  this.fragment = this._getFragment(null, true);\n        $location.replace(rootUrl + $location.search + '#' + fragment);\n        // Return immediately as browser will do redirect to new url\n        return true;\n\n        // Or if we've started out with a hash-based route, but we're currently\n        // in a browser where it could be `pushState`-based instead...\n      } else if (hasPushState && atRoot && $location.hash) {\n        let fragment = this.fragment = this._getHash().replace(routeStripper, '');\n        $history.replaceState({}, DOM.title, rootUrl + fragment + $location.search);\n      }\n    }\n\n    if (!this.fragment) {\n      this.fragment = this._getFragment('');\n    }\n\n    this.linkHandler.activate(this);\n\n    if (!normalizedOptions.silent) {\n      return this._loadUrl('');\n    }\n  }\n\n  /**\n   * Deactivates the history object.\n   */\n  deactivate(): void {\n    const handler = this._checkUrlCallback;\n    PLATFORM.removeEventListener('popstate', handler);\n    PLATFORM.removeEventListener('hashchange', handler);\n    this._isActive = false;\n    this.linkHandler.deactivate();\n  }\n\n  /**\n   * Returns the fully-qualified root of the current history object.\n   * @returns The absolute root of the application.\n   */\n  getAbsoluteRoot(): string {\n    let $location = this.location;\n    let origin = createOrigin($location.protocol, $location.hostname, $location.port);\n    return `${origin}${this.root}`;\n  }\n\n  /**\n   * Causes a history navigation to occur.\n   *\n   * @param fragment The history fragment to navigate to.\n   * @param options The set of options that specify how the navigation should occur.\n   * @return Promise if triggering navigation, otherwise true/false indicating if navigation occurred.\n   */\n  navigate(fragment?: string, {trigger = true, replace = false} = {}): boolean {\n    let location = this.location;\n    if (fragment && absoluteUrl.test(fragment)) {\n      location.href = fragment;\n      return true;\n    }\n\n    if (!this._isActive) {\n      return false;\n    }\n\n    fragment = this._getFragment(fragment || '');\n\n    if (this.fragment === fragment && !replace) {\n      return false;\n    }\n\n    this.fragment = fragment;\n\n    let url = this.root + fragment;\n\n    // Don't include a trailing slash on the root.\n    if (fragment === '' && url !== '/') {\n      url = url.slice(0, -1);\n    }\n\n    // If pushState is available, we use it to set the fragment as a real URL.\n    if (this._hasPushState) {\n      url = url.replace('//', '/');\n      this.history[replace ? 'replaceState' : 'pushState']({}, DOM.title, url);\n    } else if (this._wantsHashChange) {\n      // If hash changes haven't been explicitly disabled, update the hash\n      // fragment to store history.\n      updateHash(location, fragment, replace);\n    } else {\n      // If you've told us that you explicitly don't want fallback hashchange-\n      // based history, then `navigate` becomes a page refresh.\n      location.assign(url);\n    }\n\n    if (trigger) {\n      return this._loadUrl(fragment);\n    }\n\n    return true;\n  }\n\n  /**\n   * Causes the history state to navigate back.\n   */\n  navigateBack(): void {\n    this.history.back();\n  }\n\n  /**\n   * Sets the document title.\n   */\n  setTitle(title: string): void {\n    DOM.title = title;\n  }\n\n  /**\n   * Sets a key in the history page state.\n   * @param key The key for the value.\n   * @param value The value to set.\n   */\n  setState(key: string, value: any): void {\n    let $history = this.history;\n    let state = Object.assign({}, $history.state);\n    let { pathname, search, hash } = this.location;\n    state[key] = value;\n    $history.replaceState(state, null, `${pathname}${search}${hash}`);\n  }\n\n  /**\n   * Gets a key in the history page state.\n   * @param key The key for the value.\n   * @return The value for the key.\n   */\n  getState(key: string): any {\n    let state = Object.assign({}, this.history.state);\n    return state[key];\n  }\n\n  /**\n   * Returns the current index in the navigation history.\n   * @returns The current index.\n   */\n  getHistoryIndex(): number {\n    let historyIndex = this.getState('HistoryIndex');\n    if (historyIndex === undefined) {\n      historyIndex = this.history.length - 1;\n      this.setState('HistoryIndex', historyIndex);\n    }\n    return historyIndex;\n  }\n\n  /**\n   * Move to a specific position in the navigation history.\n   * @param movement The amount of steps, positive or negative, to move.\n   */\n  go(movement: number): void {\n    this.history.go(movement);\n  }\n\n  /**\n   * @internal\n   */\n  _getHash(): string {\n    return this.location.hash.substr(1);\n  }\n\n  /**\n   * @internal\n   */\n  _getFragment(fragment: string, forcePushState?: boolean): string {\n    let rootUrl: string;\n\n    if (!fragment) {\n      if (this._hasPushState || !this._wantsHashChange || forcePushState) {\n        let location = this.location;\n        fragment = location.pathname + location.search;\n        rootUrl = this.root.replace(trailingSlash, '');\n        if (!fragment.indexOf(rootUrl)) {\n          fragment = fragment.substr(rootUrl.length);\n        }\n      } else {\n        fragment = this._getHash();\n      }\n    }\n\n    return '/' + fragment.replace(routeStripper, '');\n  }\n\n  /**\n   * Url change handler.\n   * Invoked when current fragment is different with previous fragment\n   * @internal\n   */\n  _checkUrl(): void {\n    let current = this._getFragment('');\n    if (current !== this.fragment) {\n      this._loadUrl('');\n    }\n  }\n\n  /**\n   * invoke routeHandler\n   * @internal\n   */\n  _loadUrl(fragmentOverride: string): boolean {\n    let fragment = this.fragment = this._getFragment(fragmentOverride);\n\n    return this.options.routeHandler ?\n      this.options.routeHandler(fragment) :\n      false;\n  }\n}\n\n// Cached regex for stripping a leading hash/slash and trailing space.\nconst routeStripper = /^#?\\/*|\\s+$/g;\n\n// Cached regex for stripping leading and trailing slashes.\nconst rootStripper = /^\\/+|\\/+$/g;\n\n// Cached regex for removing a trailing slash.\nconst trailingSlash = /\\/$/;\n\n// Cached regex for detecting if a URL is absolute,\n// i.e., starts with a scheme or is scheme-relative.\n// See http://www.ietf.org/rfc/rfc2396.txt section 3.1 for valid scheme format\nconst absoluteUrl = /^([a-z][a-z0-9+\\-.]*:)?\\/\\//i;\n\n// Update the hash location, either replacing the current entry, or adding\n// a new one to the browser history.\nfunction updateHash($location: Location, fragment: string, replace: boolean) {\n  if (replace) {\n    let href = $location.href.replace(/(javascript:|#).*$/, '');\n    $location.replace(href + '#' + fragment);\n  } else {\n    // Some browsers require that `hash` contains a leading #.\n    $location.hash = '#' + fragment;\n  }\n}\n\nfunction createOrigin(protocol: string, hostname: string, port: string) {\n  return `${protocol}//${hostname}${port ? ':' + port : ''}`;\n}\n","import {History} from 'aurelia-history';\nimport {LinkHandler, DefaultLinkHandler} from './link-handler';\nimport { BrowserHistory } from './browser-history';\n\n/**\n * Configures the plugin by registering BrowserHistory as the implementation of History in the DI container.\n * @param config The FrameworkConfiguration object provided by Aurelia.\n */\nexport function configure(config: Object): void {\n  // work around for converting to TS without breaking compat\n  const $config = config as any;\n  $config.singleton(History, BrowserHistory);\n  $config.transient(LinkHandler, DefaultLinkHandler);\n}\n\nexport {\n  LinkHandler,\n  DefaultLinkHandler,\n  BrowserHistory\n};\n","import { ViewPortInstruction, RouteConfig, ViewPort, LifecycleArguments, ViewPortComponent } from './interfaces';\nimport { Router } from './router';\nimport { ActivationStrategyType, InternalActivationStrategy } from './activation-strategy';\n\n/**\n * Initialization options for a navigation instruction\n */\nexport interface NavigationInstructionInit {\n  fragment: string;\n  queryString?: string;\n  params?: Record<string, any>;\n  queryParams?: Record<string, any>;\n  config: RouteConfig;\n  parentInstruction?: NavigationInstruction;\n  previousInstruction?: NavigationInstruction;\n  router: Router;\n  options?: Object;\n  plan?: Record<string, /*ViewPortInstruction*/any>;\n}\n\nexport interface ViewPortInstructionInit {\n  name: string;\n  strategy: ActivationStrategyType;\n  moduleId: string;\n  component: ViewPortComponent;\n}\n\n/**\n * Class used to represent an instruction during a navigation.\n */\nexport class NavigationInstruction {\n  /**\n   * The URL fragment.\n   */\n  fragment: string;\n\n  /**\n   * The query string.\n   */\n  queryString: string;\n\n  /**\n   * Parameters extracted from the route pattern.\n   */\n  params: any;\n\n  /**\n   * Parameters extracted from the query string.\n   */\n  queryParams: any;\n\n  /**\n   * The route config for the route matching this instruction.\n   */\n  config: RouteConfig;\n\n  /**\n   * The parent instruction, if this instruction was created by a child router.\n   */\n  parentInstruction: NavigationInstruction;\n\n  parentCatchHandler: any;\n\n  /**\n   * The instruction being replaced by this instruction in the current router.\n   */\n  previousInstruction: NavigationInstruction;\n\n  /**\n   * viewPort instructions to used activation.\n   */\n  viewPortInstructions: Record<string, /*ViewPortInstruction*/any>;\n\n  /**\n   * The router instance.\n   */\n  router: Router;\n\n  /**\n   * Current built viewport plan of this nav instruction\n   */\n  plan: Record<string, /*ViewPortPlan*/any> = null;\n\n  options: Record<string, any> = {};\n\n  /**@internal */\n  lifecycleArgs: LifecycleArguments;\n  /**@internal */\n  resolve?: (val?: any) => void;\n\n  constructor(init: NavigationInstructionInit) {\n    Object.assign(this, init);\n\n    this.params = this.params || {};\n    this.viewPortInstructions = {};\n\n    let ancestorParams = [];\n    let current: NavigationInstruction = this;\n    do {\n      let currentParams = Object.assign({}, current.params);\n      if (current.config && current.config.hasChildRouter) {\n        // remove the param for the injected child route segment\n        delete currentParams[current.getWildCardName()];\n      }\n\n      ancestorParams.unshift(currentParams);\n      current = current.parentInstruction;\n    } while (current);\n\n    let allParams = Object.assign({}, this.queryParams, ...ancestorParams);\n    this.lifecycleArgs = [allParams, this.config, this];\n  }\n\n  /**\n   * Gets an array containing this instruction and all child instructions for the current navigation.\n   */\n  getAllInstructions(): Array<NavigationInstruction> {\n    let instructions: NavigationInstruction[] = [this];\n    let viewPortInstructions: Record<string, ViewPortInstruction> = this.viewPortInstructions;\n\n    for (let key in viewPortInstructions) {\n      let childInstruction = viewPortInstructions[key].childNavigationInstruction;\n      if (childInstruction) {\n        instructions.push(...childInstruction.getAllInstructions());\n      }\n    }\n\n    return instructions;\n  }\n\n  /**\n   * Gets an array containing the instruction and all child instructions for the previous navigation.\n   * Previous instructions are no longer available after navigation completes.\n   */\n  getAllPreviousInstructions(): Array<NavigationInstruction> {\n    return this.getAllInstructions().map(c => c.previousInstruction).filter(c => c);\n  }\n\n  /**\n   * Adds a viewPort instruction. Returns the newly created instruction based on parameters\n   */\n  addViewPortInstruction(initOptions: ViewPortInstructionInit): /*ViewPortInstruction*/ any;\n  addViewPortInstruction(viewPortName: string, strategy: ActivationStrategyType, moduleId: string, component: any): /*ViewPortInstruction*/ any;\n  addViewPortInstruction(\n    nameOrInitOptions: string | ViewPortInstructionInit,\n    strategy?: ActivationStrategyType,\n    moduleId?: string,\n    component?: any\n  ): /*ViewPortInstruction*/ any {\n\n    let viewPortInstruction: ViewPortInstruction;\n    let viewPortName = typeof nameOrInitOptions === 'string' ? nameOrInitOptions : nameOrInitOptions.name;\n    const lifecycleArgs = this.lifecycleArgs;\n    const config: RouteConfig = Object.assign({}, lifecycleArgs[1], { currentViewPort: viewPortName });\n\n    if (typeof nameOrInitOptions === 'string') {\n      viewPortInstruction = {\n        name: nameOrInitOptions,\n        strategy: strategy,\n        moduleId: moduleId,\n        component: component,\n        childRouter: component.childRouter,\n        lifecycleArgs: [lifecycleArgs[0], config, lifecycleArgs[2]] as LifecycleArguments\n      };\n    } else {\n      viewPortInstruction = {\n        name: viewPortName,\n        strategy: nameOrInitOptions.strategy,\n        component: nameOrInitOptions.component,\n        moduleId: nameOrInitOptions.moduleId,\n        childRouter: nameOrInitOptions.component.childRouter,\n        lifecycleArgs: [lifecycleArgs[0], config, lifecycleArgs[2]] as LifecycleArguments\n      };\n    }\n\n    return this.viewPortInstructions[viewPortName] = viewPortInstruction;\n  }\n\n  /**\n   * Gets the name of the route pattern's wildcard parameter, if applicable.\n   */\n  getWildCardName(): string {\n    // todo: potential issue, or at least unsafe typings\n    let configRoute = this.config.route as string;\n    let wildcardIndex = configRoute.lastIndexOf('*');\n    return configRoute.substr(wildcardIndex + 1);\n  }\n\n  /**\n   * Gets the path and query string created by filling the route\n   * pattern's wildcard parameter with the matching param.\n   */\n  getWildcardPath(): string {\n    let wildcardName = this.getWildCardName();\n    let path = this.params[wildcardName] || '';\n    let queryString = this.queryString;\n\n    if (queryString) {\n      path += '?' + queryString;\n    }\n\n    return path;\n  }\n\n  /**\n   * Gets the instruction's base URL, accounting for wildcard route parameters.\n   */\n  getBaseUrl(): string {\n    let $encodeURI = encodeURI;\n    let fragment = decodeURI(this.fragment);\n\n    if (fragment === '') {\n      let nonEmptyRoute = this.router.routes.find(route => {\n        return route.name === this.config.name &&\n          route.route !== '';\n      });\n      if (nonEmptyRoute) {\n        fragment = nonEmptyRoute.route as any;\n      }\n    }\n\n    if (!this.params) {\n      return $encodeURI(fragment);\n    }\n\n    let wildcardName = this.getWildCardName();\n    let path = this.params[wildcardName] || '';\n\n    if (!path) {\n      return $encodeURI(fragment);\n    }\n\n    return $encodeURI(fragment.substr(0, fragment.lastIndexOf(path)));\n  }\n\n  /**\n   * Finalize a viewport instruction\n   * @internal\n   */\n  _commitChanges(waitToSwap: boolean): Promise<void> {\n    let router = this.router;\n    router.currentInstruction = this;\n\n    const previousInstruction = this.previousInstruction;\n    if (previousInstruction) {\n      previousInstruction.config.navModel.isActive = false;\n    }\n\n    this.config.navModel.isActive = true;\n\n    router.refreshNavigation();\n\n    let loads: Promise<void>[] = [];\n    let delaySwaps: ISwapPlan[] = [];\n    let viewPortInstructions: Record<string, ViewPortInstruction> = this.viewPortInstructions;\n\n    for (let viewPortName in viewPortInstructions) {\n      let viewPortInstruction = viewPortInstructions[viewPortName];\n      let viewPort = router.viewPorts[viewPortName];\n\n      if (!viewPort) {\n        throw new Error(`There was no router-view found in the view for ${viewPortInstruction.moduleId}.`);\n      }\n\n      let childNavInstruction = viewPortInstruction.childNavigationInstruction;\n      if (viewPortInstruction.strategy === InternalActivationStrategy.Replace) {\n        if (childNavInstruction && childNavInstruction.parentCatchHandler) {\n          loads.push(childNavInstruction._commitChanges(waitToSwap));\n        } else {\n          if (waitToSwap) {\n            delaySwaps.push({ viewPort, viewPortInstruction });\n          }\n          loads.push(\n            viewPort\n              .process(viewPortInstruction, waitToSwap)\n              .then(() => childNavInstruction\n                ? childNavInstruction._commitChanges(waitToSwap)\n                : Promise.resolve()\n              )\n          );\n        }\n      } else {\n        if (childNavInstruction) {\n          loads.push(childNavInstruction._commitChanges(waitToSwap));\n        }\n      }\n    }\n\n    return Promise\n      .all(loads)\n      .then(() => {\n        delaySwaps.forEach(x => x.viewPort.swap(x.viewPortInstruction));\n        return null;\n      })\n      .then(() => prune(this));\n  }\n\n  /**@internal */\n  _updateTitle(): void {\n    let router = this.router;\n    let title = this._buildTitle(router.titleSeparator);\n    if (title) {\n      router.history.setTitle(title);\n    }\n  }\n\n  /**@internal */\n  _buildTitle(separator: string = ' | '): string {\n    let title = '';\n    let childTitles = [];\n    let navModelTitle = this.config.navModel.title;\n    let instructionRouter = this.router;\n    let viewPortInstructions: Record<string, ViewPortInstruction> = this.viewPortInstructions;\n\n    if (navModelTitle) {\n      title = instructionRouter.transformTitle(navModelTitle);\n    }\n\n    for (let viewPortName in viewPortInstructions) {\n      let viewPortInstruction = viewPortInstructions[viewPortName];\n      let child_nav_instruction = viewPortInstruction.childNavigationInstruction;\n\n      if (child_nav_instruction) {\n        let childTitle = child_nav_instruction._buildTitle(separator);\n        if (childTitle) {\n          childTitles.push(childTitle);\n        }\n      }\n    }\n\n    if (childTitles.length) {\n      title = childTitles.join(separator) + (title ? separator : '') + title;\n    }\n\n    if (instructionRouter.title) {\n      title += (title ? separator : '') + instructionRouter.transformTitle(instructionRouter.title);\n    }\n\n    return title;\n  }\n}\n\nconst prune = (instruction: NavigationInstruction): void => {\n  instruction.previousInstruction = null;\n  instruction.plan = null;\n};\n\ninterface ISwapPlan {\n  viewPort: ViewPort;\n  viewPortInstruction: ViewPortInstruction;\n}\n","import { RouteConfig, PipelineStep, RouteConfigSpecifier } from './interfaces';\nimport { _ensureArrayWithSingleRoutePerConfig } from './util';\nimport { Router } from './router';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { PipelineSlotName } from './pipeline-slot-name';\n\n/**\n * Class used to configure a [[Router]] instance.\n *\n * @constructor\n */\nexport class RouterConfiguration {\n  instructions: Array<(router: Router) => void> = [];\n  options: {\n    [key: string]: any;\n    compareQueryParams?: boolean;\n    root?: string;\n    pushState?: boolean;\n    hashChange?: boolean;\n    silent?: boolean;\n  } = {};\n  pipelineSteps: Array<{ name: string, step: Function | PipelineStep }> = [];\n  title: string;\n  titleSeparator: string;\n  unknownRouteConfig: RouteConfigSpecifier;\n  viewPortDefaults: Record<string, any>;\n\n  /**@internal */\n  _fallbackRoute: string;\n\n  /**\n   * Adds a step to be run during the [[Router]]'s navigation pipeline.\n   *\n   * @param name The name of the pipeline slot to insert the step into.\n   * @param step The pipeline step.\n   * @chainable\n   */\n  addPipelineStep(name: string, step: Function | PipelineStep): RouterConfiguration {\n    if (step === null || step === undefined) {\n      throw new Error('Pipeline step cannot be null or undefined.');\n    }\n    this.pipelineSteps.push({ name, step });\n    return this;\n  }\n\n  /**\n   * Adds a step to be run during the [[Router]]'s authorize pipeline slot.\n   *\n   * @param step The pipeline step.\n   * @chainable\n   */\n  addAuthorizeStep(step: Function | PipelineStep): RouterConfiguration {\n    return this.addPipelineStep(PipelineSlotName.Authorize, step);\n  }\n\n  /**\n   * Adds a step to be run during the [[Router]]'s preActivate pipeline slot.\n   *\n   * @param step The pipeline step.\n   * @chainable\n   */\n  addPreActivateStep(step: Function | PipelineStep): RouterConfiguration {\n    return this.addPipelineStep(PipelineSlotName.PreActivate, step);\n  }\n\n  /**\n   * Adds a step to be run during the [[Router]]'s preRender pipeline slot.\n   *\n   * @param step The pipeline step.\n   * @chainable\n   */\n  addPreRenderStep(step: Function | PipelineStep): RouterConfiguration {\n    return this.addPipelineStep(PipelineSlotName.PreRender, step);\n  }\n\n  /**\n   * Adds a step to be run during the [[Router]]'s postRender pipeline slot.\n   *\n   * @param step The pipeline step.\n   * @chainable\n   */\n  addPostRenderStep(step: Function | PipelineStep): RouterConfiguration {\n    return this.addPipelineStep(PipelineSlotName.PostRender, step);\n  }\n\n  /**\n   * Configures a route that will be used if there is no previous location available on navigation cancellation.\n   *\n   * @param fragment The URL fragment to use as the navigation destination.\n   * @chainable\n   */\n  fallbackRoute(fragment: string): RouterConfiguration {\n    this._fallbackRoute = fragment;\n    return this;\n  }\n\n  /**\n   * Maps one or more routes to be registered with the router.\n   *\n   * @param route The [[RouteConfig]] to map, or an array of [[RouteConfig]] to map.\n   * @chainable\n   */\n  map(route: RouteConfig | RouteConfig[]): RouterConfiguration {\n    if (Array.isArray(route)) {\n      route.forEach(r => this.map(r));\n      return this;\n    }\n\n    return this.mapRoute(route);\n  }\n\n  /**\n   * Configures defaults to use for any view ports.\n   *\n   * @param viewPortConfig a view port configuration object to use as a\n   *  default, of the form { viewPortName: { moduleId } }.\n   * @chainable\n   */\n  useViewPortDefaults(viewPortConfig: Record<string, { [key: string]: any; moduleId: string }>): RouterConfiguration {\n    this.viewPortDefaults = viewPortConfig;\n    return this;\n  }\n\n  /**\n   * Maps a single route to be registered with the router.\n   *\n   * @param route The [[RouteConfig]] to map.\n   * @chainable\n   */\n  mapRoute(config: RouteConfig): RouterConfiguration {\n    this.instructions.push(router => {\n      let routeConfigs = _ensureArrayWithSingleRoutePerConfig(config);\n\n      let navModel;\n      for (let i = 0, ii = routeConfigs.length; i < ii; ++i) {\n        let routeConfig = routeConfigs[i];\n        routeConfig.settings = routeConfig.settings || {};\n        if (!navModel) {\n          navModel = router.createNavModel(routeConfig);\n        }\n\n        router.addRoute(routeConfig, navModel);\n      }\n    });\n\n    return this;\n  }\n\n  /**\n   * Registers an unknown route handler to be run when the URL fragment doesn't match any registered routes.\n   *\n   * @param config A string containing a moduleId to load, or a [[RouteConfig]], or a function that takes the\n   *  [[NavigationInstruction]] and selects a moduleId to load.\n   * @chainable\n   */\n  mapUnknownRoutes(config: RouteConfigSpecifier): RouterConfiguration {\n    this.unknownRouteConfig = config;\n    return this;\n  }\n\n  /**\n   * Applies the current configuration to the specified [[Router]].\n   *\n   * @param router The [[Router]] to apply the configuration to.\n   */\n  exportToRouter(router: Router): void {\n    let instructions = this.instructions;\n    for (let i = 0, ii = instructions.length; i < ii; ++i) {\n      instructions[i](router);\n    }\n\n    let { title, titleSeparator, unknownRouteConfig, _fallbackRoute, viewPortDefaults } = this;\n\n    if (title) {\n      router.title = title;\n    }\n\n    if (titleSeparator) {\n      router.titleSeparator = titleSeparator;\n    }\n\n    if (unknownRouteConfig) {\n      router.handleUnknownRoutes(unknownRouteConfig);\n    }\n\n    if (_fallbackRoute) {\n      router.fallbackRoute = _fallbackRoute;\n    }\n\n    if (viewPortDefaults) {\n      router.useViewPortDefaults(viewPortDefaults);\n    }\n\n    Object.assign(router.options, this.options);\n\n    let pipelineSteps = this.pipelineSteps;\n    let pipelineStepCount = pipelineSteps.length;\n    if (pipelineStepCount) {\n      if (!router.isRoot) {\n        throw new Error('Pipeline steps can only be added to the root router');\n      }\n\n      let pipelineProvider = router.pipelineProvider;\n      for (let i = 0, ii = pipelineStepCount; i < ii; ++i) {\n        let { name, step } = pipelineSteps[i];\n        pipelineProvider.addStep(name, step);\n      }\n    }\n  }\n}\n","import { RouteRecognizer, RouteHandler, ConfigurableRoute, State, RecognizedRoute } from 'aurelia-route-recognizer';\nimport { Container } from 'aurelia-dependency-injection';\nimport { History, NavigationOptions } from 'aurelia-history';\nimport { NavigationInstruction, NavigationInstructionInit } from './navigation-instruction';\nimport { NavModel } from './nav-model';\nimport { RouterConfiguration } from './router-configuration';\nimport {\n  _ensureArrayWithSingleRoutePerConfig,\n  _normalizeAbsolutePath,\n  _createRootedPath,\n  _resolveUrl\n} from './util';\nimport { RouteConfig, RouteConfigSpecifier, ViewPortInstruction } from './interfaces';\nimport { PipelineProvider } from './pipeline-provider';\n\n/**@internal */\ndeclare module 'aurelia-history' {\n  interface History {\n    // This is wrong, as it's an implementation detail from aurelia-history-browser\n    // but we are poking it in here so probably will need to make it official in `aurelia-history`\n    /**\n     * A private flag of Aurelia History implementation to indicate if push state should be used\n     */\n    _hasPushState: boolean;\n\n    previousLocation: string;\n  }\n}\n\n/**@internal */\ndeclare module 'aurelia-route-recognizer' {\n  interface State {\n    types: {\n      dynamics: DynamicSegment;\n      stars: StarSegment;\n    };\n  }\n\n  interface RouteHandler {\n    navigationStrategy?: (instruction: NavigationInstruction) => any;\n  }\n\n  interface RecognizedRoute {\n    config?: RouteConfig;\n    queryParams?: Record<string, any>;\n  }\n}\n\ntype RouterConfigurationResolution = RouterConfiguration | ((cfg: RouterConfiguration) => void | RouterConfiguration | Promise<RouterConfiguration>);\n\n/**\n * The primary class responsible for handling routing and navigation.\n */\nexport class Router {\n\n  /**\n   * Container associated with this router. Also used to create child container for creating child router.\n   */\n  container: Container;\n\n  /**\n   * History instance of Aurelia abstract class for wrapping platform history global object\n   */\n  history: History;\n\n  /**\n   * A registry of registered viewport. Will be used to handle process navigation instruction route loading\n   * and dom swapping\n   */\n  viewPorts: Record<string, any>;\n\n  /**\n   * List of route configs registered with this router\n   */\n  routes: RouteConfig[];\n\n  /**\n  * The [[Router]]'s current base URL, typically based on the [[Router.currentInstruction]].\n  */\n  baseUrl: string;\n\n  /**\n   * If defined, used in generation of document title for [[Router]]'s routes.\n   */\n  title: string | undefined;\n\n  /**\n   * The separator used in the document title between [[Router]]'s routes.\n   */\n  titleSeparator: string | undefined;\n\n  /**\n   * True if the [[Router]] has been configured.\n   */\n  isConfigured: boolean;\n\n  /**\n   * True if the [[Router]] is currently processing a navigation.\n   */\n  isNavigating: boolean;\n\n  /**\n   * True if the [[Router]] is navigating due to explicit call to navigate function(s).\n   */\n  isExplicitNavigation: boolean;\n\n  /**\n   * True if the [[Router]] is navigating due to explicit call to navigateBack function.\n   */\n  isExplicitNavigationBack: boolean;\n\n  /**\n   * True if the [[Router]] is navigating into the app for the first time in the browser session.\n   */\n  isNavigatingFirst: boolean;\n\n  /**\n   * True if the [[Router]] is navigating to a page instance not in the browser session history.\n   */\n  isNavigatingNew: boolean;\n\n  /**\n   * True if the [[Router]] is navigating forward in the browser session history.\n   */\n  isNavigatingForward: boolean;\n\n  /**\n   * True if the [[Router]] is navigating back in the browser session history.\n   */\n  isNavigatingBack: boolean;\n\n  /**\n   * True if the [[Router]] is navigating due to a browser refresh.\n   */\n  isNavigatingRefresh: boolean;\n\n  /**\n   * True if the previous instruction successfully completed the CanDeactivatePreviousStep in the current navigation.\n   */\n  couldDeactivate: boolean;\n\n  /**\n   * The currently active navigation tracker.\n   */\n  currentNavigationTracker: number;\n\n  /**\n   * The navigation models for routes that specified [[RouteConfig.nav]].\n   */\n  navigation: NavModel[];\n\n  /**\n   * The currently active navigation instruction.\n   */\n  currentInstruction: NavigationInstruction;\n\n  /**\n   * The parent router, or null if this instance is not a child router.\n   */\n  parent: Router = null;\n\n  options: any = {};\n\n  /**\n   * The defaults used when a viewport lacks specified content\n   */\n  viewPortDefaults: Record<string, any> = {};\n\n  /**@internal */\n  catchAllHandler: (instruction: NavigationInstruction) => NavigationInstruction | Promise<NavigationInstruction>;\n  /**@internal */\n  fallbackRoute: string;\n  /**@internal */\n  pipelineProvider: PipelineProvider;\n  /**@internal */\n  _fallbackOrder: number;\n  /**@internal */\n  _recognizer: RouteRecognizer;\n  /**@internal */\n  _childRecognizer: RouteRecognizer;\n  /**@internal */\n  _configuredPromise: Promise<any>;\n  /**@internal */\n  _resolveConfiguredPromise: (value?: any) => void;\n\n  /**\n   * Extension point to transform the document title before it is built and displayed.\n   * By default, child routers delegate to the parent router, and the app router\n   * returns the title unchanged.\n   */\n  transformTitle: (title: string) => string = (title: string) => {\n    if (this.parent) {\n      return this.parent.transformTitle(title);\n    }\n    return title;\n  }\n\n  /**\n   * @param container The [[Container]] to use when child routers.\n   * @param history The [[History]] implementation to delegate navigation requests to.\n   */\n  constructor(container: Container, history: History) {\n    this.container = container;\n    this.history = history;\n    this.reset();\n  }\n\n  /**\n   * Fully resets the router's internal state. Primarily used internally by the framework when multiple calls to setRoot are made.\n   * Use with caution (actually, avoid using this). Do not use this to simply change your navigation model.\n   */\n  reset() {\n    this.viewPorts = {};\n    this.routes = [];\n    this.baseUrl = '';\n    this.isConfigured = false;\n    this.isNavigating = false;\n    this.isExplicitNavigation = false;\n    this.isExplicitNavigationBack = false;\n    this.isNavigatingFirst = false;\n    this.isNavigatingNew = false;\n    this.isNavigatingRefresh = false;\n    this.isNavigatingForward = false;\n    this.isNavigatingBack = false;\n    this.couldDeactivate = false;\n    this.navigation = [];\n    this.currentInstruction = null;\n    this.viewPortDefaults = {};\n    this._fallbackOrder = 100;\n    this._recognizer = new RouteRecognizer();\n    this._childRecognizer = new RouteRecognizer();\n    this._configuredPromise = new Promise(resolve => {\n      this._resolveConfiguredPromise = resolve;\n    });\n  }\n\n  /**\n   * Gets a value indicating whether or not this [[Router]] is the root in the router tree. I.e., it has no parent.\n   */\n  get isRoot(): boolean {\n    return !this.parent;\n  }\n\n  /**\n   * Registers a viewPort to be used as a rendering target for activated routes.\n   *\n   * @param viewPort The viewPort.\n   * @param name The name of the viewPort. 'default' if unspecified.\n   */\n  registerViewPort(viewPort: /*ViewPort*/any, name?: string): void {\n    name = name || 'default';\n    this.viewPorts[name] = viewPort;\n  }\n\n  /**\n   * Returns a Promise that resolves when the router is configured.\n   */\n  ensureConfigured(): Promise<void> {\n    return this._configuredPromise;\n  }\n\n  /**\n   * Configures the router.\n   *\n   * @param callbackOrConfig The [[RouterConfiguration]] or a callback that takes a [[RouterConfiguration]].\n   */\n  configure(callbackOrConfig: RouterConfiguration | ((config: RouterConfiguration) => RouterConfiguration)): Promise<void> {\n    this.isConfigured = true;\n\n    let result: RouterConfigurationResolution = callbackOrConfig as RouterConfiguration;\n    let config: RouterConfiguration;\n    if (typeof callbackOrConfig === 'function') {\n      config = new RouterConfiguration();\n      result = callbackOrConfig(config);\n    }\n\n    return Promise\n      .resolve(result)\n      .then((c) => {\n        if (c && (c as RouterConfiguration).exportToRouter) {\n          config = c;\n        }\n\n        config.exportToRouter(this);\n        this.isConfigured = true;\n        this._resolveConfiguredPromise();\n      });\n  }\n\n  /**\n   * Navigates to a new location.\n   *\n   * @param fragment The URL fragment to use as the navigation destination.\n   * @param options The navigation options.\n   */\n  navigate(fragment: string, options?: NavigationOptions): boolean {\n    if (!this.isConfigured && this.parent) {\n      return this.parent.navigate(fragment, options);\n    }\n\n    this.isExplicitNavigation = true;\n    return this.history.navigate(_resolveUrl(fragment, this.baseUrl, this.history._hasPushState), options);\n  }\n\n  /**\n   * Navigates to a new location corresponding to the route and params specified. Equivallent to [[Router.generate]] followed\n   * by [[Router.navigate]].\n   *\n   * @param route The name of the route to use when generating the navigation location.\n   * @param params The route parameters to be used when populating the route pattern.\n   * @param options The navigation options.\n   */\n  navigateToRoute(route: string, params?: any, options?: NavigationOptions): boolean {\n    let path = this.generate(route, params);\n    return this.navigate(path, options);\n  }\n\n  /**\n   * Navigates back to the most recent location in history.\n   */\n  navigateBack(): void {\n    this.isExplicitNavigationBack = true;\n    this.history.navigateBack();\n  }\n\n  /**\n   * Creates a child router of the current router.\n   *\n   * @param container The [[Container]] to provide to the child router. Uses the current [[Router]]'s [[Container]] if unspecified.\n   * @returns {Router} The new child Router.\n   */\n  createChild(container?: Container): Router {\n    let childRouter = new Router(container || this.container.createChild(), this.history);\n    childRouter.parent = this;\n    return childRouter;\n  }\n\n  /**\n   * Generates a URL fragment matching the specified route pattern.\n   *\n   * @param name The name of the route whose pattern should be used to generate the fragment.\n   * @param params The route params to be used to populate the route pattern.\n   * @param options If options.absolute = true, then absolute url will be generated; otherwise, it will be relative url.\n   * @returns {string} A string containing the generated URL fragment.\n   */\n  generate(nameOrRoute: string | RouteConfig, params: any = {}, options: any = {}): string {\n    // A child recognizer generates routes for potential child routes. Any potential child route is added\n    // to the childRoute property of params for the childRouter to recognize. When generating routes, we\n    // use the childRecognizer when childRoute params are available to generate a child router enabled route.\n    let recognizer = 'childRoute' in params ? this._childRecognizer : this._recognizer;\n    let hasRoute = recognizer.hasRoute(nameOrRoute as string | RouteHandler);\n    if (!hasRoute) {\n      if (this.parent) {\n        return this.parent.generate(nameOrRoute, params, options);\n      }\n      throw new Error(`A route with name '${nameOrRoute}' could not be found. Check that \\`name: '${nameOrRoute}'\\` was specified in the route's config.`);\n    }\n    let path = recognizer.generate(nameOrRoute as string | RouteHandler, params);\n    let rootedPath = _createRootedPath(path, this.baseUrl, this.history._hasPushState, options.absolute);\n    return options.absolute ? `${this.history.getAbsoluteRoot()}${rootedPath}` : rootedPath;\n  }\n\n  /**\n   * Creates a [[NavModel]] for the specified route config.\n   *\n   * @param config The route config.\n   */\n  createNavModel(config: RouteConfig): NavModel {\n    let navModel = new NavModel(\n      this,\n      'href' in config\n        ? config.href\n        // potential error when config.route is a string[] ?\n        : config.route as string);\n    navModel.title = config.title;\n    navModel.order = config.nav;\n    navModel.href = config.href;\n    navModel.settings = config.settings;\n    navModel.config = config;\n\n    return navModel;\n  }\n\n  /**\n   * Registers a new route with the router.\n   *\n   * @param config The [[RouteConfig]].\n   * @param navModel The [[NavModel]] to use for the route. May be omitted for single-pattern routes.\n   */\n  addRoute(config: RouteConfig, navModel?: NavModel): void {\n    if (Array.isArray(config.route)) {\n      let routeConfigs = _ensureArrayWithSingleRoutePerConfig(config);\n      // the following is wrong. todo: fix this after TS refactoring release\n      routeConfigs.forEach(this.addRoute.bind(this));\n      return;\n    }\n\n    validateRouteConfig(config);\n\n    if (!('viewPorts' in config) && !config.navigationStrategy) {\n      config.viewPorts = {\n        'default': {\n          moduleId: config.moduleId,\n          view: config.view\n        }\n      };\n    }\n\n    if (!navModel) {\n      navModel = this.createNavModel(config);\n    }\n\n    this.routes.push(config);\n\n    let path = config.route;\n    if (path.charAt(0) === '/') {\n      path = path.substr(1);\n    }\n    let caseSensitive = config.caseSensitive === true;\n    let state: State = this._recognizer.add({\n      path: path,\n      handler: config as RouteHandler,\n      caseSensitive: caseSensitive\n    } as ConfigurableRoute);\n\n    if (path) {\n      let settings = config.settings;\n      delete config.settings;\n      let withChild = JSON.parse(JSON.stringify(config));\n      config.settings = settings;\n      withChild.route = `${path}/*childRoute`;\n      withChild.hasChildRouter = true;\n      this._childRecognizer.add({\n        path: withChild.route,\n        handler: withChild,\n        caseSensitive: caseSensitive\n      });\n\n      withChild.navModel = navModel;\n      withChild.settings = config.settings;\n      withChild.navigationStrategy = config.navigationStrategy;\n    }\n\n    config.navModel = navModel;\n\n    let navigation = this.navigation;\n\n    if ((navModel.order || navModel.order === 0) && navigation.indexOf(navModel) === -1) {\n      if ((!navModel.href && navModel.href !== '') && (state.types.dynamics || state.types.stars)) {\n        throw new Error('Invalid route config for \"' + config.route + '\" : dynamic routes must specify an \"href:\" to be included in the navigation model.');\n      }\n\n      if (typeof navModel.order !== 'number') {\n        navModel.order = ++this._fallbackOrder;\n      }\n\n      navigation.push(navModel);\n      // this is a potential error / inconsistency between browsers\n      //\n      // MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort\n      // If compareFunction(a, b) returns 0, leave a and b unchanged with respect to each other,\n      // but sorted with respect to all different elements.\n      // Note: the ECMAscript standard does not guarantee this behaviour,\n      // and thus not all browsers (e.g. Mozilla versions dating back to at least 2003) respect this.\n      navigation.sort((a, b) => <any>a.order - <any>b.order);\n    }\n  }\n\n  /**\n   * Gets a value indicating whether or not this [[Router]] or one of its ancestors has a route registered with the specified name.\n   *\n   * @param name The name of the route to check.\n   */\n  hasRoute(name: string): boolean {\n    return !!(this._recognizer.hasRoute(name) || this.parent && this.parent.hasRoute(name));\n  }\n\n  /**\n   * Gets a value indicating whether or not this [[Router]] has a route registered with the specified name.\n   *\n   * @param name The name of the route to check.\n   */\n  hasOwnRoute(name: string): boolean {\n    return this._recognizer.hasRoute(name);\n  }\n\n  /**\n   * Register a handler to use when the incoming URL fragment doesn't match any registered routes.\n   *\n   * @param config The moduleId, or a function that selects the moduleId, or a [[RouteConfig]].\n   */\n  handleUnknownRoutes(config?: RouteConfigSpecifier): void {\n    if (!config) {\n      throw new Error('Invalid unknown route handler');\n    }\n\n    this.catchAllHandler = instruction => {\n      return this\n        ._createRouteConfig(config, instruction)\n        .then(c => {\n          instruction.config = c;\n          return instruction;\n        });\n    };\n  }\n\n  /**\n   * Updates the document title using the current navigation instruction.\n   */\n  updateTitle(): void {\n    let parentRouter = this.parent;\n    if (parentRouter) {\n      return parentRouter.updateTitle();\n    }\n\n    let currentInstruction = this.currentInstruction;\n    if (currentInstruction) {\n      currentInstruction._updateTitle();\n    }\n    return undefined;\n  }\n\n  /**\n   * Updates the navigation routes with hrefs relative to the current location.\n   * Note: This method will likely move to a plugin in a future release.\n   */\n  refreshNavigation(): void {\n    let nav = this.navigation;\n\n    for (let i = 0, length = nav.length; i < length; i++) {\n      let current = nav[i];\n      if (!current.config.href) {\n        current.href = _createRootedPath(current.relativeHref, this.baseUrl, this.history._hasPushState);\n      } else {\n        current.href = _normalizeAbsolutePath(current.config.href, this.history._hasPushState);\n      }\n    }\n  }\n\n  /**\n   * Sets the default configuration for the view ports. This specifies how to\n   *  populate a view port for which no module is specified. The default is\n   *  an empty view/view-model pair.\n   */\n  useViewPortDefaults($viewPortDefaults: Record<string, any>): void {\n    // a workaround to have strong typings while not requiring to expose interface ViewPortInstruction\n    let viewPortDefaults: Record<string, ViewPortInstruction> = $viewPortDefaults;\n    for (let viewPortName in viewPortDefaults) {\n      let viewPortConfig = viewPortDefaults[viewPortName];\n      this.viewPortDefaults[viewPortName] = {\n        moduleId: viewPortConfig.moduleId\n      };\n    }\n  }\n\n  /**@internal */\n  _refreshBaseUrl(): void {\n    let parentRouter = this.parent;\n    if (parentRouter) {\n      this.baseUrl = generateBaseUrl(parentRouter, parentRouter.currentInstruction);\n    }\n  }\n\n  /**@internal */\n  _createNavigationInstruction(url: string = '', parentInstruction: NavigationInstruction = null): Promise<NavigationInstruction> {\n    let fragment = url;\n    let queryString = '';\n\n    let queryIndex = url.indexOf('?');\n    if (queryIndex !== -1) {\n      fragment = url.substr(0, queryIndex);\n      queryString = url.substr(queryIndex + 1);\n    }\n\n    let urlRecognizationResults = this._recognizer.recognize(url) as IRouteRecognizationResults;\n    if (!urlRecognizationResults || !urlRecognizationResults.length) {\n      urlRecognizationResults = this._childRecognizer.recognize(url) as IRouteRecognizationResults;\n    }\n\n    let instructionInit: NavigationInstructionInit = {\n      fragment,\n      queryString,\n      config: null,\n      parentInstruction,\n      previousInstruction: this.currentInstruction,\n      router: this,\n      options: {\n        compareQueryParams: this.options.compareQueryParams\n      }\n    };\n\n    let result: Promise<NavigationInstruction>;\n\n    if (urlRecognizationResults && urlRecognizationResults.length) {\n      let first = urlRecognizationResults[0];\n      let instruction = new NavigationInstruction(Object.assign({}, instructionInit, {\n        params: first.params,\n        queryParams: first.queryParams || urlRecognizationResults.queryParams,\n        config: first.config || first.handler\n      }));\n\n      if (typeof first.handler === 'function') {\n        result = evaluateNavigationStrategy(instruction, first.handler, first);\n      } else if (first.handler && typeof first.handler.navigationStrategy === 'function') {\n        result = evaluateNavigationStrategy(instruction, first.handler.navigationStrategy, first.handler);\n      } else {\n        result = Promise.resolve(instruction);\n      }\n    } else if (this.catchAllHandler) {\n      let instruction = new NavigationInstruction(Object.assign({}, instructionInit, {\n        params: { path: fragment },\n        queryParams: urlRecognizationResults ? urlRecognizationResults.queryParams : {},\n        config: null // config will be created by the catchAllHandler\n      }));\n\n      result = evaluateNavigationStrategy(instruction, this.catchAllHandler);\n    } else if (this.parent) {\n      let router = this._parentCatchAllHandler(this.parent);\n\n      if (router) {\n        let newParentInstruction = this._findParentInstructionFromRouter(router, parentInstruction);\n\n        let instruction = new NavigationInstruction(Object.assign({}, instructionInit, {\n          params: { path: fragment },\n          queryParams: urlRecognizationResults ? urlRecognizationResults.queryParams : {},\n          router: router,\n          parentInstruction: newParentInstruction,\n          parentCatchHandler: true,\n          config: null // config will be created by the chained parent catchAllHandler\n        }));\n\n        result = evaluateNavigationStrategy(instruction, router.catchAllHandler);\n      }\n    }\n\n    if (result && parentInstruction) {\n      this.baseUrl = generateBaseUrl(this.parent, parentInstruction);\n    }\n\n    return result || Promise.reject(new Error(`Route not found: ${url}`));\n  }\n\n  /**@internal */\n  _findParentInstructionFromRouter(router: Router, instruction: NavigationInstruction): NavigationInstruction {\n    if (instruction.router === router) {\n      instruction.fragment = router.baseUrl; // need to change the fragment in case of a redirect instead of moduleId\n      return instruction;\n    } else if (instruction.parentInstruction) {\n      return this._findParentInstructionFromRouter(router, instruction.parentInstruction);\n    }\n    return undefined;\n  }\n\n  /**@internal */\n  _parentCatchAllHandler(router: Router): Router | false {\n    if (router.catchAllHandler) {\n      return router;\n    } else if (router.parent) {\n      return this._parentCatchAllHandler(router.parent);\n    }\n    return false;\n  }\n\n  /**\n   * @internal\n   */\n  _createRouteConfig(config: RouteConfigSpecifier, instruction: NavigationInstruction): Promise<RouteConfig> {\n    return Promise\n      .resolve(config)\n      .then((c: any) => {\n        if (typeof c === 'string') {\n          return { moduleId: c } as RouteConfig;\n        } else if (typeof c === 'function') {\n          return c(instruction);\n        }\n\n        return c;\n      })\n      // typing here could be either RouteConfig or RedirectConfig\n      // but temporarily treat both as RouteConfig\n      // todo: improve typings precision\n      .then((c: string | RouteConfig) => typeof c === 'string' ? { moduleId: c } as RouteConfig : c)\n      .then((c: RouteConfig) => {\n        c.route = instruction.params.path;\n        validateRouteConfig(c);\n\n        if (!c.navModel) {\n          c.navModel = this.createNavModel(c);\n        }\n\n        return c;\n      });\n  }\n}\n\n/* @internal exported for unit testing */\nexport const generateBaseUrl = (router: Router, instruction: NavigationInstruction): string => {\n  return `${router.baseUrl || ''}${instruction.getBaseUrl() || ''}`;\n};\n\n/* @internal exported for unit testing */\nexport const validateRouteConfig = (config: RouteConfig): void => {\n  if (typeof config !== 'object') {\n    throw new Error('Invalid Route Config');\n  }\n\n  if (typeof config.route !== 'string') {\n    let name = config.name || '(no name)';\n    throw new Error('Invalid Route Config for \"' + name + '\": You must specify a \"route:\" pattern.');\n  }\n\n  if (!('redirect' in config || config.moduleId || config.navigationStrategy || config.viewPorts)) {\n    throw new Error('Invalid Route Config for \"' + config.route + '\": You must specify a \"moduleId:\", \"redirect:\", \"navigationStrategy:\", or \"viewPorts:\".');\n  }\n};\n\n/* @internal exported for unit testing */\nexport const evaluateNavigationStrategy = (\n  instruction: NavigationInstruction,\n  evaluator: Function,\n  context?: any\n): Promise<NavigationInstruction> => {\n  return Promise\n    .resolve(evaluator.call(context, instruction))\n    .then(() => {\n      if (!('viewPorts' in instruction.config)) {\n        instruction.config.viewPorts = {\n          'default': {\n            moduleId: instruction.config.moduleId\n          }\n        };\n      }\n\n      return instruction;\n    });\n};\n\ninterface IRouteRecognizationResults extends Array<RecognizedRoute> {\n  queryParams: Record<string, any>;\n}\n","import { Router } from './router';\nimport { RouteConfig } from './interfaces';\n\n/**\n* Class for storing and interacting with a route's navigation settings.\n*/\nexport class NavModel {\n\n  /**\n  * True if this nav item is currently active.\n  */\n  isActive: boolean = false;\n\n  /**\n  * The title.\n  */\n  title: string = null;\n\n  /**\n  * This nav item's absolute href.\n  */\n  href: string = null;\n\n  /**\n  * This nav item's relative href.\n  */\n  relativeHref: string = null;\n\n  /**\n  * Data attached to the route at configuration time.\n  */\n  settings: any = {};\n\n  /**\n  * The route config.\n  */\n  config: RouteConfig = null;\n\n  /**\n  * The router associated with this navigation model.\n  */\n  router: Router;\n\n  order: number | boolean;\n\n  constructor(router: Router, relativeHref: string) {\n    this.router = router;\n    this.relativeHref = relativeHref;\n  }\n\n  /**\n  * Sets the route's title and updates document.title.\n  *  If the a navigation is in progress, the change will be applied\n  *  to document.title when the navigation completes.\n  *\n  * @param title The new title.\n  */\n  setTitle(title: string): void {\n    this.title = title;\n\n    if (this.isActive) {\n      this.router.updateTitle();\n    }\n  }\n}\n","import { RouteConfig } from './interfaces';\n\nexport function _normalizeAbsolutePath(path: string, hasPushState: boolean, absolute: boolean = false) {\n  if (!hasPushState && path[0] !== '#') {\n    path = '#' + path;\n  }\n\n  if (hasPushState && absolute) {\n    path = path.substring(1, path.length);\n  }\n\n  return path;\n}\n\nexport function _createRootedPath(fragment: string, baseUrl: string, hasPushState: boolean, absolute?: boolean) {\n  if (isAbsoluteUrl.test(fragment)) {\n    return fragment;\n  }\n\n  let path = '';\n\n  if (baseUrl.length && baseUrl[0] !== '/') {\n    path += '/';\n  }\n\n  path += baseUrl;\n\n  if ((!path.length || path[path.length - 1] !== '/') && fragment[0] !== '/') {\n    path += '/';\n  }\n\n  if (path.length && path[path.length - 1] === '/' && fragment[0] === '/') {\n    path = path.substring(0, path.length - 1);\n  }\n\n  return _normalizeAbsolutePath(path + fragment, hasPushState, absolute);\n}\n\nexport function _resolveUrl(fragment: string, baseUrl: string, hasPushState?: boolean) {\n  if (isRootedPath.test(fragment)) {\n    return _normalizeAbsolutePath(fragment, hasPushState);\n  }\n\n  return _createRootedPath(fragment, baseUrl, hasPushState);\n}\n\nexport function _ensureArrayWithSingleRoutePerConfig(config: RouteConfig) {\n  let routeConfigs = [];\n\n  if (Array.isArray(config.route)) {\n    for (let i = 0, ii = config.route.length; i < ii; ++i) {\n      let current = Object.assign({}, config);\n      current.route = config.route[i];\n      routeConfigs.push(current);\n    }\n  } else {\n    routeConfigs.push(Object.assign({}, config));\n  }\n\n  return routeConfigs;\n}\n\nconst isRootedPath = /^#?\\//;\nconst isAbsoluteUrl = /^([a-z][a-z0-9+\\-.]*:)?\\/\\//i;\n","import { PipelineStatus } from './pipeline-status';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { Next, StepRunnerFunction, NextCompletionHandler } from './interfaces';\n\n/**@internal exported for unit testing */\nexport const createNextFn = (instruction: NavigationInstruction, steps: StepRunnerFunction[]): Next => {\n  let index = -1;\n  const next: Next = function() {\n    index++;\n\n    if (index < steps.length) {\n      let currentStep = steps[index];\n\n      try {\n        return currentStep(instruction, next);\n      } catch (e) {\n        return next.reject(e);\n      }\n    } else {\n      return next.complete();\n    }\n  } as Next;\n\n  next.complete = createCompletionHandler(next, PipelineStatus.Completed);\n  next.cancel = createCompletionHandler(next, PipelineStatus.Canceled);\n  next.reject = createCompletionHandler(next, PipelineStatus.Rejected);\n\n  return next;\n};\n\n/**@internal exported for unit testing */\nexport const createCompletionHandler = (next: Next, status: PipelineStatus): NextCompletionHandler => {\n  return (output: any) => Promise\n    .resolve({\n      status,\n      output,\n      completed: status === PipelineStatus.Completed\n    });\n};\n","import { PipelineStep, PipelineResult, Next, StepRunnerFunction, IPipelineSlot } from './interfaces';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { createNextFn } from './next';\n\n/**\n * The class responsible for managing and processing the navigation pipeline.\n */\nexport class Pipeline {\n  /**\n   * The pipeline steps. And steps added via addStep will be converted to a function\n   * The actualy running functions with correct step contexts of this pipeline\n   */\n  steps: StepRunnerFunction[] = [];\n\n  /**\n   * Adds a step to the pipeline.\n   *\n   * @param step The pipeline step.\n   */\n  addStep(step: StepRunnerFunction | PipelineStep | IPipelineSlot): Pipeline {\n    let run;\n\n    if (typeof step === 'function') {\n      run = step;\n    } else if (typeof step.getSteps === 'function') {\n      // getSteps is to enable support open slots\n      // where devs can add multiple steps into the same slot name\n      let steps = step.getSteps();\n      for (let i = 0, l = steps.length; i < l; i++) {\n        this.addStep(steps[i]);\n      }\n\n      return this;\n    } else {\n      run = (step as PipelineStep).run.bind(step);\n    }\n\n    this.steps.push(run);\n\n    return this;\n  }\n\n  /**\n   * Runs the pipeline.\n   *\n   * @param instruction The navigation instruction to process.\n   */\n  run(instruction: NavigationInstruction): Promise<PipelineResult> {\n    const nextFn = createNextFn(instruction, this.steps);\n    return nextFn();\n  }\n}\n","import { NavigationOptions } from 'aurelia-history';\nimport { Router } from './router';\n\n/**@internal */\ndeclare module 'aurelia-history' {\n  interface NavigationOptions {\n    useAppRouter?: boolean;\n  }\n}\n\n/**\n* When a navigation command is encountered, the current navigation\n* will be cancelled and control will be passed to the navigation\n* command so it can determine the correct action.\n*/\nexport interface NavigationCommand {\n  navigate: (router: Router) => void;\n  /**@internal */\n  shouldContinueProcessing?: boolean;\n  /**@internal */\n  setRouter?: (router: Router) => void;\n}\n\n/**\n* Determines if the provided object is a navigation command.\n* A navigation command is anything with a navigate method.\n*\n* @param obj The object to check.\n*/\nexport function isNavigationCommand(obj: any): obj is NavigationCommand {\n  return obj && typeof obj.navigate === 'function';\n}\n\n/**\n* Used during the activation lifecycle to cause a redirect.\n*/\nexport class Redirect implements NavigationCommand {\n\n  url: string;\n  /**@internal */\n  options: NavigationOptions;\n  /**@internal */\n  shouldContinueProcessing: boolean;\n\n  private router: Router;\n\n  /**\n   * @param url The URL fragment to use as the navigation destination.\n   * @param options The navigation options.\n   */\n  constructor(url: string, options: NavigationOptions = {}) {\n    this.url = url;\n    this.options = Object.assign({ trigger: true, replace: true }, options);\n    this.shouldContinueProcessing = false;\n  }\n\n  /**\n   * Called by the activation system to set the child router.\n   *\n   * @param router The router.\n   */\n  setRouter(router: Router): void {\n    this.router = router;\n  }\n\n  /**\n   * Called by the navigation pipeline to navigate.\n   *\n   * @param appRouter The router to be redirected.\n   */\n  navigate(appRouter: Router): void {\n    let navigatingRouter = this.options.useAppRouter ? appRouter : (this.router || appRouter);\n    navigatingRouter.navigate(this.url, this.options);\n  }\n}\n\n/**\n * Used during the activation lifecycle to cause a redirect to a named route.\n */\nexport class RedirectToRoute implements NavigationCommand {\n\n  route: string;\n  params: any;\n  /**@internal */\n  options: NavigationOptions;\n\n  /**@internal */\n  shouldContinueProcessing: boolean;\n\n  /**@internal */\n  router: Router;\n\n  /**\n   * @param route The name of the route.\n   * @param params The parameters to be sent to the activation method.\n   * @param options The options to use for navigation.\n   */\n  constructor(route: string, params: any = {}, options: NavigationOptions = {}) {\n    this.route = route;\n    this.params = params;\n    this.options = Object.assign({ trigger: true, replace: true }, options);\n    this.shouldContinueProcessing = false;\n  }\n\n  /**\n   * Called by the activation system to set the child router.\n   *\n   * @param router The router.\n   */\n  setRouter(router: Router): void {\n    this.router = router;\n  }\n\n  /**\n   * Called by the navigation pipeline to navigate.\n   *\n   * @param appRouter The router to be redirected.\n   */\n  navigate(appRouter: Router): void {\n    let navigatingRouter = this.options.useAppRouter ? appRouter : (this.router || appRouter);\n    navigatingRouter.navigateToRoute(this.route, this.params, this.options);\n  }\n}\n","import { ViewPortPlan, ViewPortInstruction, RouteConfig, ViewPort } from './interfaces';\nimport { Redirect } from './navigation-commands';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { InternalActivationStrategy, ActivationStrategyType } from './activation-strategy';\n\ntype ViewPortPlansRecord = Record<string, ViewPortPlan>;\n\n/**\n * @internal exported for unit testing\n */\nexport function _buildNavigationPlan(\n  instruction: NavigationInstruction,\n  forceLifecycleMinimum?: boolean\n): Promise<ViewPortPlansRecord | Redirect> {\n  let config = instruction.config;\n\n  if ('redirect' in config) {\n    return buildRedirectPlan(instruction);\n  }\n\n  const prevInstruction = instruction.previousInstruction;\n  const defaultViewPortConfigs = instruction.router.viewPortDefaults;\n\n  if (prevInstruction) {\n    return buildTransitionPlans(instruction, prevInstruction, defaultViewPortConfigs, forceLifecycleMinimum);\n  }\n\n  // first navigation, only need to prepare a few information for each viewport plan\n  const viewPortPlans: ViewPortPlansRecord = {};\n  let viewPortConfigs = config.viewPorts;\n  for (let viewPortName in viewPortConfigs) {\n    let viewPortConfig = viewPortConfigs[viewPortName];\n    if (viewPortConfig.moduleId === null && viewPortName in defaultViewPortConfigs) {\n      viewPortConfig = defaultViewPortConfigs[viewPortName];\n    }\n    viewPortPlans[viewPortName] = {\n      name: viewPortName,\n      strategy: InternalActivationStrategy.Replace,\n      config: viewPortConfig\n    };\n  }\n\n  return Promise.resolve(viewPortPlans);\n}\n\n/**\n * Build redirect plan based on config of a navigation instruction\n * @internal exported for unit testing\n */\nexport const buildRedirectPlan = (instruction: NavigationInstruction) => {\n  const config = instruction.config;\n  const router = instruction.router;\n  return router\n    ._createNavigationInstruction(config.redirect)\n    .then(redirectInstruction => {\n\n      const params: Record<string, any> = {};\n      const originalInstructionParams = instruction.params;\n      const redirectInstructionParams = redirectInstruction.params;\n\n      for (let key in redirectInstructionParams) {\n        // If the param on the redirect points to another param, e.g. { route: first/:this, redirect: second/:this }\n        let val = redirectInstructionParams[key];\n        if (typeof val === 'string' && val[0] === ':') {\n          val = val.slice(1);\n          // And if that param is found on the original instruction then use it\n          if (val in originalInstructionParams) {\n            params[key] = originalInstructionParams[val];\n          }\n        } else {\n          params[key] = redirectInstructionParams[key];\n        }\n      }\n      let redirectLocation = router.generate(redirectInstruction.config, params, instruction.options);\n\n      // Special handling for child routes\n      for (let key in originalInstructionParams) {\n        redirectLocation = redirectLocation.replace(`:${key}`, originalInstructionParams[key]);\n      }\n\n      let queryString = instruction.queryString;\n      if (queryString) {\n        redirectLocation += '?' + queryString;\n      }\n\n      return Promise.resolve(new Redirect(redirectLocation));\n    });\n};\n\n/**\n * @param viewPortPlans the Plan record that holds information about built plans\n * @internal exported for unit testing\n */\nexport const buildTransitionPlans = (\n  currentInstruction: NavigationInstruction,\n  previousInstruction: NavigationInstruction,\n  defaultViewPortConfigs: Record<string, ViewPortInstruction>,\n  forceLifecycleMinimum?: boolean\n): Promise<ViewPortPlansRecord> => {\n\n  let viewPortPlans: ViewPortPlansRecord = {};\n  let newInstructionConfig = currentInstruction.config;\n  let hasNewParams = hasDifferentParameterValues(previousInstruction, currentInstruction);\n  let pending: Promise<void>[] = [];\n  let previousViewPortInstructions = previousInstruction.viewPortInstructions as Record<string, ViewPortInstruction>;\n\n  for (let viewPortName in previousViewPortInstructions) {\n\n    const prevViewPortInstruction = previousViewPortInstructions[viewPortName];\n    const prevViewPortComponent = prevViewPortInstruction.component;\n    const newInstructionViewPortConfigs = newInstructionConfig.viewPorts as Record<string, RouteConfig>;\n\n    // if this is invoked on a viewport without any changes, based on new url,\n    // newViewPortConfig will be the existing viewport instruction\n    let nextViewPortConfig = viewPortName in newInstructionViewPortConfigs\n      ? newInstructionViewPortConfigs[viewPortName]\n      : prevViewPortInstruction;\n\n    if (nextViewPortConfig.moduleId === null && viewPortName in defaultViewPortConfigs) {\n      nextViewPortConfig = defaultViewPortConfigs[viewPortName];\n    }\n\n    const viewPortActivationStrategy = determineActivationStrategy(\n      currentInstruction,\n      prevViewPortInstruction,\n      nextViewPortConfig,\n      hasNewParams,\n      forceLifecycleMinimum\n    );\n    const viewPortPlan = viewPortPlans[viewPortName] = {\n      name: viewPortName,\n      // ViewPortInstruction can quack like a RouteConfig\n      config: nextViewPortConfig as RouteConfig,\n      prevComponent: prevViewPortComponent,\n      prevModuleId: prevViewPortInstruction.moduleId,\n      strategy: viewPortActivationStrategy\n    } as ViewPortPlan;\n\n    // recursively build nav plans for all existing child routers/viewports of this viewport\n    // this is possible because existing child viewports and routers already have necessary information\n    // to process the wildcard path from parent instruction\n    if (viewPortActivationStrategy !== InternalActivationStrategy.Replace && prevViewPortInstruction.childRouter) {\n      const path = currentInstruction.getWildcardPath();\n      const task: Promise<void> = prevViewPortInstruction\n        .childRouter\n        ._createNavigationInstruction(path, currentInstruction)\n        .then((childInstruction: NavigationInstruction) => {\n          viewPortPlan.childNavigationInstruction = childInstruction;\n\n          return _buildNavigationPlan(\n            childInstruction,\n            // is it safe to assume viewPortPlan has not been changed from previous assignment?\n            // if so, can just use local variable viewPortPlanStrategy\n            // there could be user code modifying viewport plan during _createNavigationInstruction?\n            viewPortPlan.strategy === InternalActivationStrategy.InvokeLifecycle\n          )\n            .then(childPlan => {\n              if (childPlan instanceof Redirect) {\n                return Promise.reject(childPlan);\n              }\n              childInstruction.plan = childPlan;\n              // for bluebird ?\n              return null;\n            });\n        });\n\n      pending.push(task);\n    }\n  }\n\n  return Promise.all(pending).then(() => viewPortPlans);\n};\n\n/**\n * @param newViewPortConfig if this is invoked on a viewport without any changes, based on new url, newViewPortConfig will be the existing viewport instruction\n * @internal exported for unit testing\n */\nexport const determineActivationStrategy = (\n  currentNavInstruction: NavigationInstruction,\n  prevViewPortInstruction: ViewPortInstruction,\n  newViewPortConfig: RouteConfig | ViewPortInstruction,\n  // indicates whether there is difference between old and new url params\n  hasNewParams: boolean,\n  forceLifecycleMinimum?: boolean\n): ActivationStrategyType => {\n\n  let newInstructionConfig = currentNavInstruction.config;\n  let prevViewPortViewModel = prevViewPortInstruction.component.viewModel;\n  let viewPortPlanStrategy: ActivationStrategyType;\n\n  if (prevViewPortInstruction.moduleId !== newViewPortConfig.moduleId) {\n    viewPortPlanStrategy = InternalActivationStrategy.Replace;\n  } else if ('determineActivationStrategy' in prevViewPortViewModel) {\n    viewPortPlanStrategy = prevViewPortViewModel.determineActivationStrategy(...currentNavInstruction.lifecycleArgs);\n  } else if (newInstructionConfig.activationStrategy) {\n    viewPortPlanStrategy = newInstructionConfig.activationStrategy;\n  } else if (hasNewParams || forceLifecycleMinimum) {\n    viewPortPlanStrategy = InternalActivationStrategy.InvokeLifecycle;\n  } else {\n    viewPortPlanStrategy = InternalActivationStrategy.NoChange;\n  }\n  return viewPortPlanStrategy;\n};\n\n/**@internal exported for unit testing */\nexport const hasDifferentParameterValues = (prev: NavigationInstruction, next: NavigationInstruction): boolean => {\n  let prevParams = prev.params;\n  let nextParams = next.params;\n  let nextWildCardName = next.config.hasChildRouter ? next.getWildCardName() : null;\n\n  for (let key in nextParams) {\n    if (key === nextWildCardName) {\n      continue;\n    }\n\n    if (prevParams[key] !== nextParams[key]) {\n      return true;\n    }\n  }\n\n  for (let key in prevParams) {\n    if (key === nextWildCardName) {\n      continue;\n    }\n\n    if (prevParams[key] !== nextParams[key]) {\n      return true;\n    }\n  }\n\n  if (!next.options.compareQueryParams) {\n    return false;\n  }\n\n  let prevQueryParams = prev.queryParams;\n  let nextQueryParams = next.queryParams;\n  for (let key in nextQueryParams) {\n    if (prevQueryParams[key] !== nextQueryParams[key]) {\n      return true;\n    }\n  }\n\n  for (let key in prevQueryParams) {\n    if (prevQueryParams[key] !== nextQueryParams[key]) {\n      return true;\n    }\n  }\n\n  return false;\n};\n","import { Next } from './interfaces';\nimport { Redirect } from './navigation-commands';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { _buildNavigationPlan } from './navigation-plan';\n\n/**\n * Transform a navigation instruction into viewport plan record object,\n * or a redirect request if user viewmodel demands\n */\nexport class BuildNavigationPlanStep {\n  run(navigationInstruction: NavigationInstruction, next: Next): Promise<any> {\n    return _buildNavigationPlan(navigationInstruction)\n      .then(plan => {\n        if (plan instanceof Redirect) {\n          return next.cancel(plan);\n        }\n        navigationInstruction.plan = plan;\n        return next();\n      })\n      .catch(next.cancel);\n  }\n}\n","import { RouteConfig, ViewPortComponent, ViewPortPlan, ViewPortInstruction } from './interfaces';\nimport { Redirect } from './navigation-commands';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { _buildNavigationPlan } from './navigation-plan';\nimport { InternalActivationStrategy } from './activation-strategy';\nimport { RouteLoader } from './route-loader';\n\n/**\n * Loading plan calculated based on a navigration-instruction and a viewport plan\n */\ninterface ILoadingPlan {\n  viewPortPlan: ViewPortPlan;\n  navigationInstruction: NavigationInstruction;\n}\n\n/**\n * @internal Exported for unit testing\n */\nexport const loadNewRoute = (\n  routeLoader: RouteLoader,\n  navigationInstruction: NavigationInstruction\n): Promise<any[] | void> => {\n  let loadingPlans = determineLoadingPlans(navigationInstruction);\n  let loadPromises = loadingPlans.map((loadingPlan: ILoadingPlan) => loadRoute(\n    routeLoader,\n    loadingPlan.navigationInstruction,\n    loadingPlan.viewPortPlan\n  ));\n\n  return Promise.all(loadPromises);\n};\n\n/**\n * @internal Exported for unit testing\n */\nexport const determineLoadingPlans = (\n  navigationInstruction: NavigationInstruction,\n  loadingPlans: ILoadingPlan[] = []\n): ILoadingPlan[] => {\n  let viewPortPlans: Record<string, ViewPortPlan> = navigationInstruction.plan;\n\n  for (let viewPortName in viewPortPlans) {\n    let viewPortPlan = viewPortPlans[viewPortName];\n    let childNavInstruction = viewPortPlan.childNavigationInstruction;\n\n    if (viewPortPlan.strategy === InternalActivationStrategy.Replace) {\n      loadingPlans.push({ viewPortPlan, navigationInstruction } as ILoadingPlan);\n\n      if (childNavInstruction) {\n        determineLoadingPlans(childNavInstruction, loadingPlans);\n      }\n    } else {\n      let viewPortInstruction = navigationInstruction.addViewPortInstruction({\n        name: viewPortName,\n        strategy: viewPortPlan.strategy,\n        moduleId: viewPortPlan.prevModuleId,\n        component: viewPortPlan.prevComponent\n      }) as ViewPortInstruction;\n\n      if (childNavInstruction) {\n        viewPortInstruction.childNavigationInstruction = childNavInstruction;\n        determineLoadingPlans(childNavInstruction, loadingPlans);\n      }\n    }\n  }\n\n  return loadingPlans;\n};\n\n/**\n * @internal Exported for unit testing\n */\nexport const loadRoute = (\n  routeLoader: RouteLoader,\n  navigationInstruction: NavigationInstruction,\n  viewPortPlan: ViewPortPlan\n): Promise<any> => {\n  let planConfig = viewPortPlan.config;\n  let moduleId = planConfig ? planConfig.moduleId : null;\n\n  return loadComponent(routeLoader, navigationInstruction, planConfig)\n    .then((component) => {\n      let viewPortInstruction = navigationInstruction.addViewPortInstruction({\n        name: viewPortPlan.name,\n        strategy: viewPortPlan.strategy,\n        moduleId: moduleId,\n        component: component\n      }) as ViewPortInstruction;\n\n      let childRouter = component.childRouter;\n      if (childRouter) {\n        let path = navigationInstruction.getWildcardPath();\n\n        return childRouter\n          ._createNavigationInstruction(path, navigationInstruction)\n          .then((childInstruction) => {\n            viewPortPlan.childNavigationInstruction = childInstruction;\n\n            return _buildNavigationPlan(childInstruction)\n              .then((childPlan) => {\n                if (childPlan instanceof Redirect) {\n                  return Promise.reject(childPlan);\n                }\n                childInstruction.plan = childPlan;\n                viewPortInstruction.childNavigationInstruction = childInstruction;\n\n                return loadNewRoute(routeLoader, childInstruction);\n              });\n          });\n      }\n      // ts complains without this, though they are same\n      return void 0;\n    });\n};\n\n/**\n * Load a routed-component based on navigation instruction and route config\n * @internal exported for unit testing only\n */\nexport const loadComponent = (\n  routeLoader: RouteLoader,\n  navigationInstruction: NavigationInstruction,\n  config: RouteConfig\n): Promise<ViewPortComponent> => {\n  let router = navigationInstruction.router;\n  let lifecycleArgs = navigationInstruction.lifecycleArgs;\n\n  return Promise.resolve()\n    .then(() => routeLoader.loadRoute(router, config, navigationInstruction))\n    .then(\n      /**\n       * @param component an object carrying information about loaded route\n       * typically contains information about view model, childContainer, view and router\n       */\n      (component: ViewPortComponent) => {\n        let { viewModel, childContainer } = component;\n        component.router = router;\n        component.config = config;\n\n        if ('configureRouter' in viewModel) {\n          let childRouter = childContainer.getChildRouter();\n          component.childRouter = childRouter;\n\n          return childRouter\n            .configure(c => viewModel.configureRouter(c, childRouter, lifecycleArgs[0], lifecycleArgs[1], lifecycleArgs[2]))\n            .then(() => component);\n        }\n\n        return component;\n      }\n    );\n};\n","import { Origin } from 'aurelia-metadata';\nimport { relativeToFile } from 'aurelia-path';\nimport { NavigationInstruction, RouteConfig, RouteLoader, Router } from 'aurelia-router';\nimport { CompositionEngine, customElement, inlineView, useView, CompositionContext } from 'aurelia-templating';\nimport { RouterViewLocator } from './router-view';\nimport { Container } from 'aurelia-dependency-injection';\n\n/**@internal exported for unit testing */\nexport class EmptyClass { }\ninlineView('<template></template>')(EmptyClass);\n\n/**\n * Default implementation of `RouteLoader` used for loading component based on a route config\n */\nexport class TemplatingRouteLoader extends RouteLoader {\n\n  /**@internal */\n  static inject = [CompositionEngine];\n\n  /**@internal */\n  compositionEngine: CompositionEngine;\n\n  constructor(\n    compositionEngine: CompositionEngine\n  ) {\n    super();\n    this.compositionEngine = compositionEngine;\n  }\n\n  /**\n   * Resolve a view model from a RouteConfig\n   * Throws when there is neither \"moduleId\" nor \"viewModel\" property\n   * @internal\n   */\n  resolveViewModel(router: Router, config: RouteConfig): Promise<string | null | Function> {\n    return new Promise((resolve, reject) => {\n      let viewModel: string | null | Function;\n      if ('moduleId' in config) {\n        let moduleId = config.moduleId;\n        if (moduleId === null) {\n          viewModel = EmptyClass;\n        } else {\n          // this requires container of router has passes a certain point\n          // where a view model has been setup on the container\n          // it will fail in enhance scenario because no viewport has been registered\n          moduleId = relativeToFile(moduleId, Origin.get(router.container.viewModel.constructor).moduleId);\n          if (/\\.html/i.test(moduleId)) {\n            viewModel = createDynamicClass(moduleId);\n          } else {\n            viewModel = moduleId;\n          }\n        }\n        return resolve(viewModel);\n      }\n      // todo: add if ('viewModel' in config) to support static view model resolution\n      reject(new Error('Invalid route config. No \"moduleId\" found.'));\n    });\n  }\n\n  /**\n   * Create child container based on a router container\n   * Also ensures that child router are properly constructed in the newly created child container\n   * @internal\n   */\n  createChildContainer(router: Router): Container {\n    const childContainer = router.container.createChild();\n\n    childContainer.registerSingleton(RouterViewLocator);\n    childContainer.getChildRouter = function() {\n      let childRouter: Router;\n\n      childContainer.registerHandler(\n        Router,\n        () => childRouter || (childRouter = router.createChild(childContainer))\n      );\n\n      return childContainer.get(Router);\n    };\n    return childContainer;\n  }\n\n  /**\n   * Load corresponding component of a route config of a navigation instruction\n   */\n  loadRoute(router: Router, config: RouteConfig, _navInstruction: NavigationInstruction): Promise<any> {\n    return this\n      .resolveViewModel(router, config)\n      .then(viewModel => this.compositionEngine.ensureViewModel({\n        viewModel: viewModel,\n        childContainer: this.createChildContainer(router),\n        view: config.view || config.viewStrategy,\n        router: router\n      } as CompositionContext));\n  }\n}\n\n/**@internal exported for unit testing */\nexport function createDynamicClass(moduleId: string) {\n  const name = /([^\\/^\\?]+)\\.html/i.exec(moduleId)[1];\n\n  class DynamicClass {\n\n    $parent: any;\n\n    bind(bindingContext: any) {\n      this.$parent = bindingContext;\n    }\n  }\n\n  customElement(name)(DynamicClass);\n  useView(moduleId)(DynamicClass);\n\n  return DynamicClass;\n}\n","import { Next } from './interfaces';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { loadNewRoute } from './utilities-route-loading';\nimport { RouteLoader } from './route-loader';\n/**\n * A pipeline step responsible for loading a route config of a navigation instruction\n */\nexport class LoadRouteStep {\n  /**@internal */\n  static inject() { return [RouteLoader]; }\n  /**\n   * Route loader isntance that will handle loading route config\n   * @internal\n   */\n  routeLoader: RouteLoader;\n  constructor(routeLoader: RouteLoader) {\n    this.routeLoader = routeLoader;\n  }\n  /**\n   * Run the internal to load route config of a navigation instruction to prepare for next steps in the pipeline\n   */\n  run(navigationInstruction: NavigationInstruction, next: Next): Promise<any> {\n    return loadNewRoute(this.routeLoader, navigationInstruction)\n      .then(next, next.cancel);\n  }\n}\n","import { NavigationInstruction } from './navigation-instruction';\n\n/**\n * A pipeline step for instructing a piepline to commit changes on a navigation instruction\n */\nexport class CommitChangesStep {\n  run(navigationInstruction: NavigationInstruction, next: Function): Promise<any> {\n    return navigationInstruction\n      ._commitChanges(/*wait to swap?*/ true)\n      .then(() => {\n        navigationInstruction._updateTitle();\n        return next();\n      });\n  }\n}\n","/**\n * An optional interface describing the available activation strategies.\n * @internal Used internally.\n */\nexport const enum InternalActivationStrategy {\n  /**\n   * Reuse the existing view model, without invoking Router lifecycle hooks.\n   */\n  NoChange = 'no-change',\n  /**\n   * Reuse the existing view model, invoking Router lifecycle hooks.\n   */\n  InvokeLifecycle = 'invoke-lifecycle',\n  /**\n   * Replace the existing view model, invoking Router lifecycle hooks.\n   */\n  Replace = 'replace'\n}\n\n/**\n * The strategy to use when activating modules during navigation.\n */\n// kept for compat reason\nexport const activationStrategy: ActivationStrategy = {\n  noChange: InternalActivationStrategy.NoChange,\n  invokeLifecycle: InternalActivationStrategy.InvokeLifecycle,\n  replace: InternalActivationStrategy.Replace\n};\n\n/**\n * An optional interface describing the available activation strategies.\n */\nexport interface ActivationStrategy {\n  /**\n   * Reuse the existing view model, without invoking Router lifecycle hooks.\n   */\n  noChange: 'no-change';\n  /**\n   * Reuse the existing view model, invoking Router lifecycle hooks.\n   */\n  invokeLifecycle: 'invoke-lifecycle';\n  /**\n   * Replace the existing view model, invoking Router lifecycle hooks.\n   */\n  replace: 'replace';\n}\n\n/**\n * Enum like type for activation strategy built-in values\n */\nexport type ActivationStrategyType = ActivationStrategy[keyof ActivationStrategy];\n","import { Next, ViewPortComponent, ViewPortPlan, ViewPortInstruction, LifecycleArguments } from './interfaces';\nimport { isNavigationCommand } from './navigation-commands';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { activationStrategy } from './activation-strategy';\nimport { Router } from './router';\n\n/**\n * Recursively find list of deactivate-able view models\n * and invoke the either 'canDeactivate' or 'deactivate' on each\n * @internal exported for unit testing\n */\nexport const processDeactivatable = (\n  navigationInstruction: NavigationInstruction,\n  callbackName: 'canDeactivate' | 'deactivate',\n  next: Next,\n  ignoreResult?: boolean\n): Promise<any> => {\n  let plan: Record<string, ViewPortPlan> = navigationInstruction.plan;\n  let infos = findDeactivatable(plan, callbackName);\n  let i = infos.length; // query from inside out\n\n  function inspect(val: any): Promise<any> {\n    if (ignoreResult || shouldContinue(val)) {\n      return iterate();\n    }\n\n    return next.cancel(val);\n  }\n\n  function iterate(): Promise<any> {\n    if (i--) {\n      try {\n        let viewModel = infos[i];\n        let result = viewModel[callbackName](navigationInstruction);\n        return processPotential(result, inspect, next.cancel);\n      } catch (error) {\n        return next.cancel(error);\n      }\n    }\n\n    navigationInstruction.router.couldDeactivate = true;\n\n    return next();\n  }\n\n  return iterate();\n};\n\n/**\n * Recursively find and returns a list of deactivate-able view models\n * @internal exported for unit testing\n */\nexport const findDeactivatable = (\n  plan: Record<string, ViewPortPlan>,\n  callbackName: string,\n  list: IActivatableInfo[] = []\n): any[] => {\n  for (let viewPortName in plan) {\n    let viewPortPlan = plan[viewPortName];\n    let prevComponent = viewPortPlan.prevComponent;\n\n    if ((viewPortPlan.strategy === activationStrategy.invokeLifecycle || viewPortPlan.strategy === activationStrategy.replace)\n      && prevComponent\n    ) {\n      let viewModel = prevComponent.viewModel;\n\n      if (callbackName in viewModel) {\n        list.push(viewModel);\n      }\n    }\n\n    if (viewPortPlan.strategy === activationStrategy.replace && prevComponent) {\n      addPreviousDeactivatable(prevComponent, callbackName, list);\n    } else if (viewPortPlan.childNavigationInstruction) {\n      findDeactivatable(viewPortPlan.childNavigationInstruction.plan, callbackName, list);\n    }\n  }\n\n  return list;\n};\n\n/**\n * @internal exported for unit testing\n */\nexport const addPreviousDeactivatable = (\n  component: ViewPortComponent,\n  callbackName: string,\n  list: IActivatableInfo[]\n): void => {\n  let childRouter = component.childRouter;\n\n  if (childRouter && childRouter.currentInstruction) {\n    let viewPortInstructions = childRouter.currentInstruction.viewPortInstructions;\n\n    for (let viewPortName in viewPortInstructions) {\n      let viewPortInstruction = viewPortInstructions[viewPortName];\n      let prevComponent = viewPortInstruction.component;\n      let prevViewModel = prevComponent.viewModel;\n\n      if (callbackName in prevViewModel) {\n        list.push(prevViewModel);\n      }\n\n      addPreviousDeactivatable(prevComponent, callbackName, list);\n    }\n  }\n};\n\n/**\n * @internal exported for unit testing\n */\nexport const processActivatable = (\n  navigationInstruction: NavigationInstruction,\n  callbackName: 'canActivate' | 'activate',\n  next: Next,\n  ignoreResult?: boolean\n): Promise<any> => {\n  let infos = findActivatable(navigationInstruction, callbackName);\n  let length = infos.length;\n  let i = -1; // query from top down\n\n  function inspect(val: any, router: Router): Promise<any> {\n    if (ignoreResult || shouldContinue(val, router)) {\n      return iterate();\n    }\n\n    return next.cancel(val);\n  }\n\n  function iterate(): Promise<any> {\n    i++;\n\n    if (i < length) {\n      try {\n        let current = infos[i];\n        let result = current.viewModel[callbackName](...current.lifecycleArgs);\n        return processPotential(result, (val: any) => inspect(val, current.router), next.cancel);\n      } catch (error) {\n        return next.cancel(error);\n      }\n    }\n\n    return next();\n  }\n\n  return iterate();\n};\n\ninterface IActivatableInfo {\n  viewModel: any;\n  lifecycleArgs: LifecycleArguments;\n  router: Router;\n}\n\n/**\n * Find list of activatable view model and add to list (3rd parameter)\n * @internal exported for unit testing\n */\nexport const findActivatable = (\n  navigationInstruction: NavigationInstruction,\n  callbackName: 'canActivate' | 'activate',\n  list: IActivatableInfo[] = [],\n  router?: Router\n): IActivatableInfo[] => {\n  let plan: Record<string, ViewPortPlan> = navigationInstruction.plan;\n\n  Object\n    .keys(plan)\n    .forEach((viewPortName) => {\n      let viewPortPlan = plan[viewPortName];\n      let viewPortInstruction = navigationInstruction.viewPortInstructions[viewPortName] as ViewPortInstruction;\n      let viewPortComponent = viewPortInstruction.component;\n      let viewModel = viewPortComponent.viewModel;\n\n      if (\n        (viewPortPlan.strategy === activationStrategy.invokeLifecycle\n          || viewPortPlan.strategy === activationStrategy.replace\n        )\n        && callbackName in viewModel\n      ) {\n        list.push({\n          viewModel,\n          lifecycleArgs: viewPortInstruction.lifecycleArgs,\n          router\n        });\n      }\n\n      let childNavInstruction = viewPortPlan.childNavigationInstruction;\n\n      if (childNavInstruction) {\n        findActivatable(\n          childNavInstruction,\n          callbackName,\n          list,\n          viewPortComponent.childRouter || router\n        );\n      }\n    });\n\n  return list;\n};\n\nconst shouldContinue = <T = any>(output: T, router?: Router): boolean | T => {\n  if (output instanceof Error) {\n    return false;\n  }\n\n  if (isNavigationCommand(output)) {\n    if (typeof output.setRouter === 'function') {\n      output.setRouter(router);\n    }\n\n    return !!output.shouldContinueProcessing;\n  }\n\n  if (output === undefined) {\n    return true;\n  }\n\n  return output;\n};\n\n/**\n * A basic interface for an Observable type\n */\nexport interface IObservable {\n  subscribe(sub?: IObservableConfig): ISubscription;\n}\n\nexport interface IObservableConfig {\n  next(): void;\n  error(err?: any): void;\n  complete(): void;\n}\n\n/**\n * A basic interface for a Subscription to an Observable\n */\ninterface ISubscription {\n  unsubscribe(): void;\n}\n\ntype SafeSubscriptionFunc = (sub: SafeSubscription) => ISubscription;\n\n/**\n * wraps a subscription, allowing unsubscribe calls even if\n * the first value comes synchronously\n */\nclass SafeSubscription {\n\n  private _subscribed: boolean;\n  private _subscription: ISubscription;\n\n  constructor(subscriptionFunc: SafeSubscriptionFunc) {\n    this._subscribed = true;\n    this._subscription = subscriptionFunc(this);\n\n    if (!this._subscribed) {\n      this.unsubscribe();\n    }\n  }\n\n  get subscribed(): boolean {\n    return this._subscribed;\n  }\n\n  unsubscribe(): void {\n    if (this._subscribed && this._subscription) {\n      this._subscription.unsubscribe();\n    }\n\n    this._subscribed = false;\n  }\n}\n\n/**\n * A function to process return value from `activate`/`canActivate` steps\n * Supports observable/promise\n *\n * For observable, resolve at first next() or on complete()\n */\nconst processPotential = (obj: any, resolve: (val?: any) => any, reject: (err?: any) => any): any => {\n  // if promise like\n  if (obj && typeof obj.then === 'function') {\n    return Promise.resolve(obj).then(resolve).catch(reject);\n  }\n\n  // if observable\n  if (obj && typeof obj.subscribe === 'function') {\n    let obs: IObservable = obj;\n    return new SafeSubscription(sub => obs.subscribe({\n      next() {\n        if (sub.subscribed) {\n          sub.unsubscribe();\n          resolve(obj);\n        }\n      },\n      error(error) {\n        if (sub.subscribed) {\n          sub.unsubscribe();\n          reject(error);\n        }\n      },\n      complete() {\n        if (sub.subscribed) {\n          sub.unsubscribe();\n          resolve(obj);\n        }\n      }\n    }));\n  }\n\n  // else just resolve\n  try {\n    return resolve(obj);\n  } catch (error) {\n    return reject(error);\n  }\n};\n","import { Next } from './interfaces';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { processDeactivatable, processActivatable } from './utilities-activation';\n\n/**\n * A pipeline step responsible for finding and activating method `canDeactivate` on a view model of a route\n */\nexport class CanDeactivatePreviousStep {\n  run(navigationInstruction: NavigationInstruction, next: Next): Promise<any> {\n    return processDeactivatable(navigationInstruction, 'canDeactivate', next);\n  }\n}\n\n/**\n * A pipeline step responsible for finding and activating method `canActivate` on a view model of a route\n */\nexport class CanActivateNextStep {\n  run(navigationInstruction: NavigationInstruction, next: Next): Promise<any> {\n    return processActivatable(navigationInstruction, 'canActivate', next);\n  }\n}\n\n/**\n * A pipeline step responsible for finding and activating method `deactivate` on a view model of a route\n */\nexport class DeactivatePreviousStep {\n  run(navigationInstruction: NavigationInstruction, next: Next): Promise<any> {\n    return processDeactivatable(navigationInstruction, 'deactivate', next, true);\n  }\n}\n\n/**\n * A pipeline step responsible for finding and activating method `activate` on a view model of a route\n */\nexport class ActivateNextStep {\n  run(navigationInstruction: NavigationInstruction, next: Next): Promise<any> {\n    return processActivatable(navigationInstruction, 'activate', next, true);\n  }\n}\n","import { Container } from 'aurelia-dependency-injection';\nimport { Pipeline } from './pipeline';\nimport { BuildNavigationPlanStep } from './step-build-navigation-plan';\nimport { LoadRouteStep } from './step-load-route';\nimport { CommitChangesStep } from './step-commit-changes';\nimport { CanDeactivatePreviousStep, CanActivateNextStep, DeactivatePreviousStep, ActivateNextStep } from './step-activation';\nimport { PipelineStep, StepRunnerFunction, IPipelineSlot } from './interfaces';\nimport { PipelineSlotName } from './pipeline-slot-name';\n\n/**\n * A multi-slots Pipeline Placeholder Step for hooking into a pipeline execution\n */\nclass PipelineSlot implements IPipelineSlot {\n\n  /**@internal */\n  container: Container;\n  /**@internal */\n  slotName: string;\n  /**@internal */\n  slotAlias?: string;\n\n  steps: (Function | PipelineStep)[] = [];\n\n  constructor(container: Container, name: string, alias?: string) {\n    this.container = container;\n    this.slotName = name;\n    this.slotAlias = alias;\n  }\n\n  getSteps(): (StepRunnerFunction | IPipelineSlot | PipelineStep)[] {\n    return this.steps.map(x => this.container.get(x));\n  }\n}\n\n/**\n * Class responsible for creating the navigation pipeline.\n */\nexport class PipelineProvider {\n\n  /**@internal */\n  static inject() { return [Container]; }\n  /**@internal */\n  container: Container;\n  /**@internal */\n  steps: (Function | PipelineSlot)[];\n\n  constructor(container: Container) {\n    this.container = container;\n    this.steps = [\n      BuildNavigationPlanStep,\n      CanDeactivatePreviousStep, // optional\n      LoadRouteStep,\n      createPipelineSlot(container, PipelineSlotName.Authorize),\n      CanActivateNextStep, // optional\n      createPipelineSlot(container, PipelineSlotName.PreActivate, 'modelbind'),\n      // NOTE: app state changes start below - point of no return\n      DeactivatePreviousStep, // optional\n      ActivateNextStep, // optional\n      createPipelineSlot(container, PipelineSlotName.PreRender, 'precommit'),\n      CommitChangesStep,\n      createPipelineSlot(container, PipelineSlotName.PostRender, 'postcomplete')\n    ];\n  }\n\n  /**\n   * Create the navigation pipeline.\n   */\n  createPipeline(useCanDeactivateStep: boolean = true): Pipeline {\n    let pipeline = new Pipeline();\n    this.steps.forEach(step => {\n      if (useCanDeactivateStep || step !== CanDeactivatePreviousStep) {\n        pipeline.addStep(this.container.get(step));\n      }\n    });\n    return pipeline;\n  }\n\n  /**@internal */\n  _findStep(name: string): PipelineSlot {\n    // Steps that are not PipelineSlots are constructor functions, and they will automatically fail. Probably.\n    return this.steps.find(x => (x as PipelineSlot).slotName === name || (x as PipelineSlot).slotAlias === name) as PipelineSlot;\n  }\n\n  /**\n   * Adds a step into the pipeline at a known slot location.\n   */\n  addStep(name: string, step: PipelineStep | Function): void {\n    let found = this._findStep(name);\n    if (found) {\n      let slotSteps = found.steps;\n      // prevent duplicates\n      if (!slotSteps.includes(step)) {\n        slotSteps.push(step);\n      }\n    } else {\n      throw new Error(`Invalid pipeline slot name: ${name}.`);\n    }\n  }\n\n  /**\n   * Removes a step from a slot in the pipeline\n   */\n  removeStep(name: string, step: PipelineStep): void {\n    let slot = this._findStep(name);\n    if (slot) {\n      let slotSteps = slot.steps;\n      slotSteps.splice(slotSteps.indexOf(step), 1);\n    }\n  }\n\n  /**\n   * Clears all steps from a slot in the pipeline\n   * @internal\n   */\n  _clearSteps(name: string = ''): void {\n    let slot = this._findStep(name);\n    if (slot) {\n      slot.steps = [];\n    }\n  }\n\n  /**\n   * Resets all pipeline slots\n   */\n  reset(): void {\n    this._clearSteps(PipelineSlotName.Authorize);\n    this._clearSteps(PipelineSlotName.PreActivate);\n    this._clearSteps(PipelineSlotName.PreRender);\n    this._clearSteps(PipelineSlotName.PostRender);\n  }\n}\n\n/**@internal */\nconst createPipelineSlot = (container: Container, name: PipelineSlotName, alias?: string): PipelineSlot => {\n  return new PipelineSlot(container, name, alias);\n};\n","import * as LogManager from 'aurelia-logging';\nimport { Container } from 'aurelia-dependency-injection';\nimport { History, NavigationOptions } from 'aurelia-history';\nimport { Router } from './router';\nimport { PipelineProvider } from './pipeline-provider';\nimport { isNavigationCommand } from './navigation-commands';\nimport { EventAggregator } from 'aurelia-event-aggregator';\nimport { NavigationInstruction } from './navigation-instruction';\nimport { ViewPort, ConfiguresRouter, PipelineResult } from './interfaces';\nimport { RouterEvent } from './router-event';\nimport { RouterConfiguration } from './router-configuration';\n\n/**@internal */\ndeclare module 'aurelia-dependency-injection' {\n  interface Container {\n    viewModel?: any;\n  }\n}\n\nconst logger = LogManager.getLogger('app-router');\n\n/**\n * The main application router.\n */\nexport class AppRouter extends Router {\n\n  /**@internal */\n  static inject() { return [Container, History, PipelineProvider, EventAggregator]; }\n\n  events: EventAggregator;\n  /**@internal */\n  maxInstructionCount: number;\n  /**@internal */\n  _queue: NavigationInstruction[];\n  /**@internal */\n  isActive: boolean;\n\n  constructor(container: Container, history: History, pipelineProvider: PipelineProvider, events: EventAggregator) {\n    super(container, history); // Note the super will call reset internally.\n    this.pipelineProvider = pipelineProvider;\n    this.events = events;\n  }\n\n  /**\n   * Fully resets the router's internal state. Primarily used internally by the framework when multiple calls to setRoot are made.\n   * Use with caution (actually, avoid using this). Do not use this to simply change your navigation model.\n   */\n  reset(): void {\n    super.reset();\n    this.maxInstructionCount = 10;\n    if (!this._queue) {\n      this._queue = [];\n    } else {\n      this._queue.length = 0;\n    }\n  }\n\n  /**\n   * Loads the specified URL.\n   *\n   * @param url The URL fragment to load.\n   */\n  loadUrl(url: string): Promise<NavigationInstruction> {\n    return this\n      ._createNavigationInstruction(url)\n      .then(instruction => this._queueInstruction(instruction))\n      .catch(error => {\n        logger.error(error);\n        restorePreviousLocation(this);\n      });\n  }\n\n  /**\n   * Registers a viewPort to be used as a rendering target for activated routes.\n   *\n   * @param viewPort The viewPort. This is typically a <router-view/> element in Aurelia default impl\n   * @param name The name of the viewPort. 'default' if unspecified.\n   */\n  registerViewPort(viewPort: /*ViewPort*/ any, name?: string): Promise<any> {\n    // having strong typing without changing public API\n    const $viewPort: ViewPort = viewPort;\n    super.registerViewPort($viewPort, name);\n\n    // beside adding viewport to the registry of this instance\n    // AppRouter also configure routing/history to start routing functionality\n    // There are situation where there are more than 1 <router-view/> element at root view\n    // in that case, still only activate once via the following guard\n    if (!this.isActive) {\n      const viewModel = this._findViewModel($viewPort);\n      if ('configureRouter' in viewModel) {\n        // If there are more than one <router-view/> element at root view\n        // use this flag to guard against configure method being invoked multiple times\n        // this flag is set inside method configure\n        if (!this.isConfigured) {\n          // replace the real resolve with a noop to guarantee that any action in base class Router\n          // won't resolve the configurePromise prematurely\n          const resolveConfiguredPromise = this._resolveConfiguredPromise;\n          this._resolveConfiguredPromise = () => {/**/};\n          return this\n            .configure(config =>\n              Promise\n                .resolve(viewModel.configureRouter(config, this))\n                // an issue with configure interface. Should be fixed there\n                // todo: fix this via configure interface in router\n                .then(() => config) as any\n            )\n            .then(() => {\n              this.activate();\n              resolveConfiguredPromise();\n            });\n        }\n      } else {\n        this.activate();\n      }\n    }\n    // when a viewport is added dynamically to a root view that is already activated\n    // just process the navigation instruction\n    else {\n      this._dequeueInstruction();\n    }\n\n    return Promise.resolve();\n  }\n\n  /**\n   * Activates the router. This instructs the router to begin listening for history changes and processing instructions.\n   *\n   * @params options The set of options to activate the router with.\n   */\n  activate(options?: NavigationOptions): void {\n    if (this.isActive) {\n      return;\n    }\n\n    this.isActive = true;\n    // route handler property is responsible for handling url change\n    // the interface of aurelia-history isn't clear on this perspective\n    this.options = Object.assign({ routeHandler: this.loadUrl.bind(this) }, this.options, options);\n    this.history.activate(this.options);\n    this._dequeueInstruction();\n  }\n\n  /**\n   * Deactivates the router.\n   */\n  deactivate(): void {\n    this.isActive = false;\n    this.history.deactivate();\n  }\n\n  /**@internal */\n  _queueInstruction(instruction: NavigationInstruction): Promise<any> {\n    return new Promise((resolve) => {\n      instruction.resolve = resolve;\n      this._queue.unshift(instruction);\n      this._dequeueInstruction();\n    });\n  }\n\n  /**@internal */\n  _dequeueInstruction(instructionCount: number = 0): Promise<PipelineResult | void> {\n    return Promise.resolve().then(() => {\n      if (this.isNavigating && !instructionCount) {\n        // ts complains about inconsistent returns without void 0\n        return void 0;\n      }\n\n      let instruction = this._queue.shift();\n      this._queue.length = 0;\n\n      if (!instruction) {\n        // ts complains about inconsistent returns without void 0\n        return void 0;\n      }\n\n      this.isNavigating = true;\n\n      let navtracker: number = this.history.getState('NavigationTracker');\n      let currentNavTracker = this.currentNavigationTracker;\n\n      if (!navtracker && !currentNavTracker) {\n        this.isNavigatingFirst = true;\n        this.isNavigatingNew = true;\n      } else if (!navtracker) {\n        this.isNavigatingNew = true;\n      } else if (!currentNavTracker) {\n        this.isNavigatingRefresh = true;\n      } else if (currentNavTracker < navtracker) {\n        this.isNavigatingForward = true;\n      } else if (currentNavTracker > navtracker) {\n        this.isNavigatingBack = true;\n      } if (!navtracker) {\n        navtracker = Date.now();\n        this.history.setState('NavigationTracker', navtracker);\n      }\n      this.currentNavigationTracker = navtracker;\n\n      instruction.previousInstruction = this.currentInstruction;\n\n      let maxInstructionCount = this.maxInstructionCount;\n\n      if (!instructionCount) {\n        this.events.publish(RouterEvent.Processing, { instruction });\n      } else if (instructionCount === maxInstructionCount - 1) {\n        logger.error(`${instructionCount + 1} navigation instructions have been attempted without success. Restoring last known good location.`);\n        restorePreviousLocation(this);\n        return this._dequeueInstruction(instructionCount + 1);\n      } else if (instructionCount > maxInstructionCount) {\n        throw new Error('Maximum navigation attempts exceeded. Giving up.');\n      }\n\n      let pipeline = this.pipelineProvider.createPipeline(!this.couldDeactivate);\n\n      return pipeline\n        .run(instruction)\n        .then(result => processResult(instruction, result, instructionCount, this))\n        .catch(error => {\n          return { output: error instanceof Error ? error : new Error(error) } as PipelineResult;\n        })\n        .then(result => resolveInstruction(instruction, result, !!instructionCount, this));\n    });\n  }\n\n  /**@internal */\n  _findViewModel(viewPort: ViewPort): ConfiguresRouter | undefined {\n    if (this.container.viewModel) {\n      return this.container.viewModel;\n    }\n\n    if (viewPort.container) {\n      let container = viewPort.container;\n\n      while (container) {\n        if (container.viewModel) {\n          this.container.viewModel = container.viewModel;\n          return container.viewModel;\n        }\n\n        container = container.parent;\n      }\n    }\n\n    return undefined;\n  }\n}\n\nconst processResult = (\n  instruction: NavigationInstruction,\n  result: PipelineResult,\n  instructionCount: number,\n  router: AppRouter\n): Promise<PipelineResult> => {\n  if (!(result && 'completed' in result && 'output' in result)) {\n    result = result || {} as PipelineResult;\n    result.output = new Error(`Expected router pipeline to return a navigation result, but got [${JSON.stringify(result)}] instead.`);\n  }\n\n  let finalResult: PipelineResult = null;\n  let navigationCommandResult = null;\n  if (isNavigationCommand(result.output)) {\n    navigationCommandResult = result.output.navigate(router);\n  } else {\n    finalResult = result;\n\n    if (!result.completed) {\n      if (result.output instanceof Error) {\n        logger.error(result.output.toString());\n      }\n\n      restorePreviousLocation(router);\n    }\n  }\n\n  return Promise.resolve(navigationCommandResult)\n    .then(_ => router._dequeueInstruction(instructionCount + 1))\n    .then(innerResult => finalResult || innerResult || result);\n};\n\nconst resolveInstruction = (\n  instruction: NavigationInstruction,\n  result: PipelineResult,\n  isInnerInstruction: boolean,\n  router: AppRouter\n): PipelineResult => {\n  instruction.resolve(result);\n\n  let eventAggregator = router.events;\n  let eventArgs = { instruction, result };\n  if (!isInnerInstruction) {\n    router.isNavigating = false;\n    router.isExplicitNavigation = false;\n    router.isExplicitNavigationBack = false;\n    router.isNavigatingFirst = false;\n    router.isNavigatingNew = false;\n    router.isNavigatingRefresh = false;\n    router.isNavigatingForward = false;\n    router.isNavigatingBack = false;\n    router.couldDeactivate = false;\n\n    let eventName: string;\n\n    if (result.output instanceof Error) {\n      eventName = RouterEvent.Error;\n    } else if (!result.completed) {\n      eventName = RouterEvent.Canceled;\n    } else {\n      let queryString = instruction.queryString ? ('?' + instruction.queryString) : '';\n      router.history.previousLocation = instruction.fragment + queryString;\n      eventName = RouterEvent.Success;\n    }\n\n    eventAggregator.publish(eventName, eventArgs);\n    eventAggregator.publish(RouterEvent.Complete, eventArgs);\n  } else {\n    eventAggregator.publish(RouterEvent.ChildComplete, eventArgs);\n  }\n\n  return result;\n};\n\nconst restorePreviousLocation = (router: AppRouter): void => {\n  let previousLocation = router.history.previousLocation;\n  if (previousLocation) {\n    router.navigate(previousLocation, { trigger: false, replace: true });\n  } else if (router.fallbackRoute) {\n    router.navigate(router.fallbackRoute, { trigger: true, replace: true });\n  } else {\n    logger.error('Router navigation failed, and no previous location or fallbackRoute could be restored.');\n  }\n};\n","/**\n* The status of a Pipeline.\n*/\nexport const enum PipelineStatus {\n  Completed = 'completed',\n  Canceled = 'canceled',\n  Rejected = 'rejected',\n  Running = 'running'\n}\n","/**\n * A list of known router events used by the Aurelia router\n * to signal the pipeline has come to a certain state\n */\n// const enum is preserved in tsconfig\nexport const enum RouterEvent {\n  Processing = 'router:navigation:processing',\n  Error = 'router:navigation:error',\n  Canceled = 'router:navigation:canceled',\n  Complete = 'router:navigation:complete',\n  Success = 'router:navigation:success',\n  ChildComplete = 'router:navigation:child:complete'\n}\n","/**\n * Available pipeline slot names to insert interceptor into router pipeline\n */\n// const enum is preserved in tsconfig\nexport const enum PipelineSlotName {\n  /**\n   * Authorization slot. Invoked early in the pipeline,\n   * before `canActivate` hook of incoming route\n   */\n  Authorize = 'authorize',\n  /**\n   * Pre-activation slot. Invoked early in the pipeline,\n   * Invoked timing:\n   *   - after Authorization slot\n   *   - after canActivate hook on new view model\n   *   - before deactivate hook on old view model\n   *   - before activate hook on new view model\n   */\n  PreActivate = 'preActivate',\n  /**\n   * Pre-render slot. Invoked later in the pipeline\n   * Invokcation timing:\n   *   - after activate hook on new view model\n   *   - before commit step on new navigation instruction\n   */\n  PreRender = 'preRender',\n  /**\n   * Post-render slot. Invoked last in the pipeline\n   */\n  PostRender = 'postRender'\n}\n","import { Container } from 'aurelia-dependency-injection';\nimport { createOverrideContext, OverrideContext } from 'aurelia-binding';\nimport {\n  ViewSlot,\n  ViewLocator,\n  BehaviorInstruction,\n  CompositionTransaction,\n  CompositionEngine,\n  ShadowDOM,\n  SwapStrategies,\n  ResourceDescription,\n  HtmlBehaviorResource,\n  CompositionTransactionNotifier,\n  View,\n  CompositionTransactionOwnershipToken,\n  Controller,\n  ViewFactory,\n  CompositionContext,\n  IStaticResourceConfig,\n  IStaticViewConfig\n} from 'aurelia-templating';\nimport {\n  Router\n} from 'aurelia-router';\nimport { Origin } from 'aurelia-metadata';\nimport { DOM } from 'aurelia-pal';\nimport { IRouterViewViewPortInstruction, Constructable } from './interfaces';\n\nclass EmptyLayoutViewModel {\n\n}\n\n/**\n * Implementation of Aurelia Router ViewPort. Responsible for loading route, composing and swapping routes views\n */\nexport class RouterView {\n\n  /**@internal */\n  static inject() {\n    return [DOM.Element, Container, ViewSlot, Router, ViewLocator, CompositionTransaction, CompositionEngine];\n  }\n\n  /**\n   * @internal Actively avoid using decorator to reduce the amount of code generated\n   *\n   * There is no view to compose by default in a router view\n   * This custom element is responsible for composing its own view, based on current config\n   */\n  static $view: IStaticViewConfig = null;\n  /**\n   * @internal Actively avoid using decorator to reduce the amount of code generated\n   */\n  static $resource: IStaticResourceConfig = {\n    name: 'router-view',\n    bindables: ['swapOrder', 'layoutView', 'layoutViewModel', 'layoutModel', 'inherit-binding-context'] as any\n  };\n\n  /**\n   * Swapping order when going to a new route. By default, supports 3 value: before, after, with\n   * - before = new in -> old out\n   * - after = old out -> new in\n   * - with = new in + old out\n   *\n   * These values are defined by swapStrategies export in aurelia-templating/ aurelia-framework\n   * Can be extended there and used here\n   */\n  swapOrder?: string;\n\n  /**\n   * Layout view used for this router-view layout, if no layout-viewmodel specified\n   */\n  layoutView?: any;\n\n  /**\n   * Layout view model used as binding context for this router-view layout\n   * Actual type would be {string | Constructable | object}\n   */\n  layoutViewModel?: any;\n\n  /**\n   * Layout model used to activate layout view model, if specified with `layoutViewModel`\n   */\n  layoutModel?: any;\n\n  /**\n   * Element associated with this <router-view/> custom element\n   */\n  readonly element: Element;\n\n  /**\n   * Current router associated with this <router-view/>\n   */\n  readonly router: Router;\n\n  /**\n   * Container at this <router-view/> level\n   */\n  container: Container;\n\n  /**\n   * @internal\n   * the view slot for adding / removing Routing related views created dynamically\n   */\n  viewSlot: ViewSlot;\n\n  /**\n   * @internal\n   * Used to mimic partially functionalities of CompositionEngine\n   */\n  viewLocator: ViewLocator;\n\n  /**\n   * @internal\n   * View composed by the CompositionEngine, depends on layout / viewports/ moduleId / viewModel of routeconfig\n   */\n  view: View;\n\n  /**\n   * @internal\n   * The view where this `<router-view/>` is placed in\n   */\n  owningView: View;\n\n  /**\n   * @internal\n   * Composition Transaction of initial composition transaction, when this <router-view/> is created\n   */\n  compositionTransaction: CompositionTransaction;\n\n  /**\n   * @internal\n   * CompositionEngine instance, responsible for composing view/view model during process changes phase of this <router-view/>\n   */\n  compositionEngine: CompositionEngine;\n\n  /**\n   * Composition transaction notifier instance. Created when this router-view composing its instruction\n   * for the first time.\n   * Null on 2nd time and after.\n   * @internal\n   */\n  compositionTransactionNotifier: CompositionTransactionNotifier;\n\n  /**\n   * @internal\n   */\n  compositionTransactionOwnershipToken: CompositionTransactionOwnershipToken;\n\n  /**\n   * @internal\n   */\n  overrideContext: OverrideContext;\n\n  constructor(\n    element: Element,\n    container: Container,\n    viewSlot: ViewSlot,\n    router: Router,\n    viewLocator: ViewLocator,\n    compositionTransaction: CompositionTransaction,\n    compositionEngine: CompositionEngine\n  ) {\n    this.element = element;\n    this.container = container;\n    this.viewSlot = viewSlot;\n    this.router = router;\n    this.viewLocator = viewLocator;\n    this.compositionTransaction = compositionTransaction;\n    this.compositionEngine = compositionEngine;\n    // add this <router-view/> to router view ports lookup based on name attribute\n    // when this router is the root router-view\n    // also trigger AppRouter registerViewPort extra flow\n    this.router.registerViewPort(this, this.element.getAttribute('name'));\n\n    // Each <router-view/> process its instruction as a composition transaction\n    // there are differences between intial composition and subsequent compositions\n    // also there are differences between root composition and child <router-view/> composition\n    // mark the first composition transaction with a property initialComposition to distinguish it\n    // when the root <router-view/> gets new instruction for the first time\n    if (!('initialComposition' in compositionTransaction)) {\n      compositionTransaction.initialComposition = true;\n      this.compositionTransactionNotifier = compositionTransaction.enlist();\n    }\n  }\n\n  created(owningView: View): void {\n    this.owningView = owningView;\n  }\n\n  bind(bindingContext: any, overrideContext: OverrideContext): void {\n    // router needs to get access to view model of current route parent\n    // doing it in generic way via viewModel property on container\n    this.container.viewModel = bindingContext;\n    this.overrideContext = overrideContext;\n  }\n\n  /**\n   * Implementation of `aurelia-router` ViewPort interface, responsible for templating related part in routing Pipeline\n   */\n  process($viewPortInstruction: any, waitToSwap?: boolean): Promise<void> {\n    // have strong typings without exposing it in public typings, this is to ensure maximum backward compat\n    const viewPortInstruction = $viewPortInstruction as IRouterViewViewPortInstruction;\n    const component = viewPortInstruction.component;\n    const childContainer = component.childContainer;\n    const viewModel = component.viewModel;\n    const viewModelResource = component.viewModelResource as unknown as ResourceDescription;\n    const metadata = viewModelResource.metadata;\n    const config = component.router.currentInstruction.config;\n    const viewPortConfig = config.viewPorts ? (config.viewPorts[viewPortInstruction.name] || {}) : {};\n\n    (childContainer.get(RouterViewLocator) as RouterViewLocator)._notify(this);\n\n    // layoutInstruction is our layout viewModel\n    const layoutInstruction = {\n      viewModel: viewPortConfig.layoutViewModel || config.layoutViewModel || this.layoutViewModel,\n      view: viewPortConfig.layoutView || config.layoutView || this.layoutView,\n      model: viewPortConfig.layoutModel || config.layoutModel || this.layoutModel,\n      router: viewPortInstruction.component.router,\n      childContainer: childContainer,\n      viewSlot: this.viewSlot\n    };\n\n    // viewport will be a thin wrapper around composition engine\n    // to process instruction/configuration from users\n    // preparing all information related to a composition process\n    // first by getting view strategy of a ViewPortComponent View\n    const viewStrategy = this.viewLocator.getViewStrategy(component.view || viewModel);\n    if (viewStrategy && component.view) {\n      viewStrategy.makeRelativeTo(Origin.get(component.router.container.viewModel.constructor).moduleId);\n    }\n\n    // using metadata of a custom element view model to load appropriate view-factory instance\n    return metadata\n      .load(childContainer, viewModelResource.value, null, viewStrategy, true)\n      // for custom element, viewFactory typing is always ViewFactory\n      // for custom attribute, it will be HtmlBehaviorResource\n      .then((viewFactory: ViewFactory | HtmlBehaviorResource) => {\n        // if this is not the first time that this <router-view/> is composing its instruction\n        // try to capture ownership of the composition transaction\n        // child <router-view/> will not be able to capture, since root <router-view/> typically captures\n        // the ownership token\n        if (!this.compositionTransactionNotifier) {\n          this.compositionTransactionOwnershipToken = this.compositionTransaction.tryCapture();\n        }\n\n        if (layoutInstruction.viewModel || layoutInstruction.view) {\n          viewPortInstruction.layoutInstruction = layoutInstruction;\n        }\n\n        const viewPortComponentBehaviorInstruction = BehaviorInstruction.dynamic(\n          this.element,\n          viewModel,\n          viewFactory as ViewFactory\n        );\n        viewPortInstruction.controller = metadata.create(childContainer, viewPortComponentBehaviorInstruction);\n\n        if (waitToSwap) {\n          return null;\n        }\n\n        this.swap(viewPortInstruction);\n      });\n  }\n\n  swap($viewPortInstruction: any): void | Promise<void> {\n    // have strong typings without exposing it in public typings, this is to ensure maximum backward compat\n    const viewPortInstruction: IRouterViewViewPortInstruction = $viewPortInstruction;\n    const viewPortController = viewPortInstruction.controller;\n    const layoutInstruction = viewPortInstruction.layoutInstruction;\n    const previousView = this.view;\n\n    // Final step of swapping a <router-view/> ViewPortComponent\n    const work = () => {\n      const swapStrategy = SwapStrategies[this.swapOrder] || SwapStrategies.after;\n      const viewSlot = this.viewSlot;\n\n      swapStrategy(\n        viewSlot,\n        previousView,\n        () => Promise.resolve(viewSlot.add(this.view))\n      ).then(() => {\n        this._notify();\n      });\n    };\n\n    // Ensure all users setups have been completed\n    const ready = (owningView_or_layoutView: View) => {\n      viewPortController.automate(this.overrideContext, owningView_or_layoutView);\n      const transactionOwnerShipToken = this.compositionTransactionOwnershipToken;\n      // if this router-view is the root <router-view/> of a normal startup via aurelia.setRoot\n      // attemp to take control of the transaction\n\n      // if ownership can be taken\n      // wait for transaction to complete before swapping\n      if (transactionOwnerShipToken) {\n        return transactionOwnerShipToken\n          .waitForCompositionComplete()\n          .then(() => {\n            this.compositionTransactionOwnershipToken = null;\n            return work();\n          });\n      }\n\n      // otherwise, just swap\n      return work();\n    };\n\n    // If there is layout instruction, new to compose layout before processing ViewPortComponent\n    // layout controller/view/view-model is composed using composition engine APIs\n    if (layoutInstruction) {\n      if (!layoutInstruction.viewModel) {\n        // createController chokes if there's no viewmodel, so create a dummy one\n        // but avoid using a POJO as it creates unwanted metadata in Object constructor\n        layoutInstruction.viewModel = new EmptyLayoutViewModel();\n      }\n\n      // using composition engine to create compose layout\n      return this.compositionEngine\n        // first create controller from layoutInstruction\n        // and treat it as CompositionContext\n        // then emulate slot projection with ViewPortComponent view\n        .createController(layoutInstruction as CompositionContext)\n        .then((layoutController: Controller) => {\n          const layoutView = layoutController.view;\n          ShadowDOM.distributeView(viewPortController.view, layoutController.slots || layoutView.slots);\n          // when there is a layout\n          // view hierarchy is: <router-view/> owner view -> layout view -> ViewPortComponent view\n          layoutController.automate(createOverrideContext(layoutInstruction.viewModel), this.owningView);\n          layoutView.children.push(viewPortController.view);\n          return layoutView || layoutController;\n        })\n        .then((newView: View | Controller) => {\n          this.view = newView as View;\n          return ready(newView as View);\n        });\n    }\n\n    // if there is no layout, then get ViewPortComponent view ready as view property\n    // and process controller/swapping\n    // when there is no layout\n    // view hierarchy is: <router-view/> owner view -> ViewPortComponent view\n    this.view = viewPortController.view;\n\n    return ready(this.owningView);\n  }\n\n  /**\n   * Notify composition transaction that this router has finished processing\n   * Happens when this <router-view/> is the root router-view\n   * @internal\n   */\n  _notify() {\n    const notifier = this.compositionTransactionNotifier;\n    if (notifier) {\n      notifier.done();\n      this.compositionTransactionNotifier = null;\n    }\n  }\n}\n\n/**\n* Locator which finds the nearest RouterView, relative to the current dependency injection container.\n*/\nexport class RouterViewLocator {\n\n  /*@internal */\n  promise: Promise<any>;\n\n  /*@internal */\n  resolve: (val?: any) => void;\n\n  /**\n  * Creates an instance of the RouterViewLocator class.\n  */\n  constructor() {\n    this.promise = new Promise((resolve) => this.resolve = resolve);\n  }\n\n  /**\n  * Finds the nearest RouterView instance.\n  * @returns A promise that will be resolved with the located RouterView instance.\n  */\n  findNearest(): Promise<RouterView> {\n    return this.promise;\n  }\n\n  /**@internal */\n  _notify(routerView: RouterView): void {\n    this.resolve(routerView);\n  }\n}\n","import { IStaticResourceConfig } from 'aurelia-templating';\nimport { Router } from 'aurelia-router';\nimport { DOM } from 'aurelia-pal';\nimport * as LogManager from 'aurelia-logging';\n\nconst logger = LogManager.getLogger('route-href');\n\n/**\n * Helper custom attribute to help associate an element with a route by name\n */\nexport class RouteHref {\n\n  /*@internal */\n  static inject() {\n    return [Router, DOM.Element];\n  }\n\n  /**\n   * @internal Actively avoid using decorator to reduce the amount of code generated\n   */\n  static $resource: IStaticResourceConfig = {\n    type: 'attribute',\n    name: 'route-href',\n    bindables: [\n      { name: 'route', changeHandler: 'processChange', primaryProperty: true },\n      { name: 'params', changeHandler: 'processChange' },\n      'attribute'\n    ] as any // type definition of Aurelia templating is wrong\n  };\n\n  /**\n   * Current router of this attribute\n   */\n  readonly router: Router;\n\n  /**\n   * Element this attribute is associated with\n   */\n  readonly element: Element;\n\n  /**@internal */\n  isActive: boolean;\n\n  /**\n   * Name of the route this attribute refers to. This name should exist in the current router hierarchy\n   */\n  route: string;\n\n  /**\n   * Parameters of this attribute to generate URL.\n   */\n  params: Record<string, any>;\n\n  /**\n   * Target property on a custom element if this attribute is put on a custom element\n   * OR an attribute if this attribute is put on a normal element\n   */\n  attribute: string;\n\n  constructor(\n    router: Router,\n    element: Element\n  ) {\n    this.router = router;\n    this.element = element;\n    this.attribute = 'href';\n  }\n\n  bind() {\n    this.isActive = true;\n    this.processChange();\n  }\n\n  unbind() {\n    this.isActive = false;\n  }\n\n  attributeChanged(value: any, previous: any) {\n    if (previous) {\n      this.element.removeAttribute(previous);\n    }\n\n    return this.processChange();\n  }\n\n  processChange() {\n    return this.router\n      .ensureConfigured()\n      .then((): null => {\n        if (!this.isActive) {\n          // returning null to avoid Bluebird warning\n          return null;\n        }\n        const element = this.element as Element & { au: any };\n\n        const href = this.router.generate(this.route, this.params);\n\n        if (element.au.controller) {\n          element.au.controller.viewModel[this.attribute] = href;\n        } else {\n          element.setAttribute(this.attribute, href);\n        }\n\n        // returning null to avoid Bluebird warning\n        return null;\n      })\n      .catch((reason: any) => {\n        logger.error(reason);\n      });\n  }\n}\n\n","import { Router, AppRouter, RouteLoader } from 'aurelia-router';\nimport { TemplatingRouteLoader } from './route-loader';\nimport { RouterView } from './router-view';\nimport { RouteHref } from './route-href';\nimport { IFrameworkConfiguration } from './interfaces';\n\nexport function configure(config: IFrameworkConfiguration) {\n  config\n    .singleton(RouteLoader, TemplatingRouteLoader)\n    .singleton(Router, AppRouter)\n    .globalResources(\n      RouterView,\n      RouteHref\n    );\n\n  config.container.registerAlias(Router, AppRouter);\n}\n\nexport {\n  TemplatingRouteLoader,\n  RouterView,\n  RouteHref\n};\n"]}