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 on:focusin=\"saveFocus(event)\"\n  on:focusout=\"clearFocus()\"\n>\n  <slot></slot>\n</div>\n<script>\n  import { PAGE_HISTORY_SIZE } from '../_static/pages.js'\n  import { QuickLRU } from '../_thirdparty/quick-lru/quick-lru.ts'\n  import { tryToFocusElement } from '../_utils/tryToFocusElement.js'\n\n  const cache = new QuickLRU({ maxSize: PAGE_HISTORY_SIZE })\n\n  if (process.browser) {\n    window.__focusRestorationCache = cache\n  }\n\n  export default {\n    oncreate () {\n      this.setupPushState()\n      this.restoreFocus()\n      if (process.env.NODE_ENV !== 'production') {\n        if (!this.get().realm) {\n          throw new Error('FocusRestoration needs a realm')\n        }\n      }\n    },\n    ondestroy () {\n      this.teardownPushState()\n    },\n    methods: {\n      setupPushState () {\n        this.onPushState = this.onPushState.bind(this)\n        this.setInCache({ ignoreBlurEvents: false })\n        window.addEventListener('pushState', this.onPushState)\n      },\n      teardownPushState () {\n        window.removeEventListener('pushState', this.onPushState)\n      },\n      setInCache (obj) {\n        const { realm } = this.get()\n        if (!cache.has(realm)) {\n          cache.set(realm, {})\n        }\n        Object.assign(cache.get(realm), obj)\n      },\n      deleteInCache (key) {\n        const { realm } = this.get()\n        if (cache.has(realm)) {\n          delete cache.get(realm)[key]\n        }\n      },\n      getInCache () {\n        const { realm } = this.get()\n        return cache.get(realm) || {}\n      },\n      onPushState () {\n        this.setInCache({ ignoreBlurEvents: true })\n      },\n      restoreFocus () {\n        const { realm } = this.get()\n        const { elementId } = this.getInCache()\n        if (!elementId) {\n          return\n        }\n        console.log('restoreFocus', realm, elementId)\n        tryToFocusElement(elementId)\n      },\n      clearFocus () {\n        const { realm } = this.get()\n        const { ignoreBlurEvents } = this.getInCache()\n        if (!ignoreBlurEvents) {\n          console.log('clearFocus', realm)\n          this.deleteInCache('elementId')\n        }\n      },\n      saveFocus (e) {\n        const { realm } = this.get()\n        const element = e.target\n        if (element) {\n          const elementId = element.getAttribute('id')\n          if (elementId) {\n            console.log('saveFocus', realm, elementId)\n            this.setInCache({ elementId })\n          }\n        }\n      }\n    }\n  }\n</script>\n","// Forked from https://github.com/sindresorhus/quick-lru/blob/16d15d470a8eb87c2a7dd5b80892d9b74f1acd3c/index.js\n// removes some unused code\nexport class QuickLRU {\n    maxSize;\n    cache;\n    oldCache;\n    _size;\n    constructor(options = {}) {\n        if (!(options.maxSize && options.maxSize > 0)) {\n            throw new TypeError('`maxSize` must be a number greater than 0');\n        }\n        this.maxSize = options.maxSize;\n        this.cache = new Map();\n        this.oldCache = new Map();\n        this._size = 0;\n    }\n    _set(key, value) {\n        this.cache.set(key, value);\n        this._size++;\n        if (this._size >= this.maxSize) {\n            this._size = 0;\n            this.oldCache = this.cache;\n            this.cache = new Map();\n        }\n    }\n    get(key) {\n        if (this.cache.has(key)) {\n            return this.cache.get(key);\n        }\n        if (this.oldCache.has(key)) {\n            const value = this.oldCache.get(key);\n            this.oldCache.delete(key);\n            this._set(key, value);\n            return value;\n        }\n    }\n    set(key, value) {\n        if (this.cache.has(key)) {\n            this.cache.set(key, value);\n        }\n        else {\n            this._set(key, value);\n        }\n        return this;\n    }\n    has(key) {\n        return this.cache.has(key) || this.oldCache.has(key);\n    }\n    // unused\n    // peek (key) {\n    //   if (this.cache.has(key)) {\n    //     return this.cache.get(key)\n    //   }\n    //\n    //   if (this.oldCache.has(key)) {\n    //     return this.oldCache.get(key)\n    //   }\n    // }\n    delete(key) {\n        const deleted = this.cache.delete(key);\n        if (deleted) {\n            this._size--;\n        }\n        return this.oldCache.delete(key) || deleted;\n    }\n    clear() {\n        this.cache.clear();\n        this.oldCache.clear();\n        this._size = 0;\n    }\n    getAllKeys() {\n        const set = new Set();\n        for (const key of this.cache.keys()) {\n            set.add(key);\n        }\n        for (const key of this.oldCache.keys()) {\n            set.add(key);\n        }\n        return set;\n    }\n}\n","export const PAGE_HISTORY_SIZE = 10\n","// try 5 times to wait for the element to be rendered and then focus it\nimport { scheduleIdleTask } from './scheduleIdleTask.js'\n\nconst RETRIES = 5\nconst TIMEOUT = 50\n\nexport async function tryToFocusElement (id, scroll) {\n  for (let i = 0; i < RETRIES; i++) {\n    if (i > 0) {\n      await new Promise(resolve => setTimeout(resolve, TIMEOUT))\n    }\n    await new Promise(resolve => scheduleIdleTask(resolve))\n    const element = document.getElementById(id)\n    if (element) {\n      try {\n        element.focus({ preventScroll: !scroll })\n        console.log('focused element', id)\n        return\n      } catch (e) {\n        console.error(e)\n      }\n    }\n  }\n  console.log('failed to focus element', 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