@lucidclient/speculate/dist/index.cjs.map

A lightweight library to handle speculate rules for prefetching and prerendering documents, with added support for data fetching on intent.

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* Determines if the clients connection is appropriate\n */\nconst validConnection = (): boolean => {\n\tif (!navigator.onLine) {\n\t\tconsole.warn(\"The device is offline, speculate library not initialised.\");\n\t\treturn false;\n\t}\n\tif (\"connection\" in navigator) {\n\t\tconst connection = navigator.connection;\n\t\t// @ts-expect-error\n\t\tif (connection?.saveData) {\n\t\t\tconsole.warn(\"Save-Data is enabled, speculate library not initialised.\");\n\t\t\treturn false;\n\t\t}\n\t\t// @ts-expect-error\n\t\tif (/(2|3)g/.test(connection?.effectiveType)) {\n\t\t\tconsole.warn(\n\t\t\t\t\"2G or 3G connection is detected, speculate library not initialised.\",\n\t\t\t);\n\t\t\treturn false;\n\t\t}\n\t}\n\n\treturn true;\n};\n\nexport default validConnection;\n","import type { SpeculationTriggers, SpeculationActions } from \"../types.js\";\nimport validConnection from \"../utils/valid-connection.js\";\n\nconst C: {\n\tmoderateEvents: Array<keyof HTMLElementEventMap>;\n\tfallbackTriggerSupport: Array<SpeculationTriggers>;\n\tfallbackTrigger: SpeculationTriggers;\n\tfallbackAction: SpeculationActions;\n\tvalidActions: SpeculationActions[];\n\tvalidTriggers: SpeculationTriggers[];\n\tgenSpeculate: string;\n} = {\n\tmoderateEvents: [\"mouseenter\", \"touchstart\", \"focus\"],\n\tfallbackTriggerSupport: [\"visible\", \"moderate\"],\n\tfallbackTrigger: \"moderate\",\n\tfallbackAction: \"prefetch\",\n\tvalidActions: [\"prefetch\", \"prerender\"],\n\tvalidTriggers: [\"visible\", \"immediate\", \"eager\", \"moderate\", \"conservative\"],\n\tgenSpeculate: \"gen-speculate\",\n};\n\nlet initialised = false;\nconst prefetched = new Set<string>();\nconst speculationSupport =\n\t\"supports\" in HTMLScriptElement &&\n\tHTMLScriptElement.supports &&\n\tHTMLScriptElement.supports(\"speculationrules\");\nconst prefetchSupport = document\n\t.createElement(\"link\")\n\t.relList?.supports?.(\"prefetch\");\nlet observer: IntersectionObserver;\nlet 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[href],\n\t\t\t\teagerness: config[1] === \"visible\" ? undefined : config[1],\n\t\t\t},\n\t\t];\n\t\tspecScript.textContent =\n\t\t\tconfig[0] === \"prefetch\"\n\t\t\t\t? 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This will also tidy up any generated speculation rules, prefetch links and cancel any on-going fetches.\n */\nconst destroy = () => {\n\tabortController.abort();\n\tabortController = new AbortController();\n\tobserver?.disconnect();\n\tprefetched.clear();\n\tinitialised = false;\n\n\tconst clearEles = document.querySelectorAll(\n\t\t`link[${C.genSpeculate}], script[${C.genSpeculate}]`,\n\t);\n\tfor (const ele of clearEles) {\n\t\tele.remove();\n\t}\n};\n\n/**\n * Initialises the speculation library using requestIdleCallback if available\n */\nconst init = () => {\n\ttypeof requestIdleCallback !== \"undefined\"\n\t\t? requestIdleCallback(speculationLinks)\n\t\t: setTimeout(speculationLinks, 0);\n\n\treturn destroy;\n};\n\nexport default init;\n","import type {\n\tSpeculatorConfig,\n\tOptimisticPrefetchStrategy,\n\tIntentResponse,\n\tTargetElements,\n} from \"../types.js\";\nimport validConnection from \"../utils/valid-connection.js\";\n\nclass Speculator<T, D> {\n\tprivate cache = new Map<\n\t\tstring,\n\t\t{\n\t\t\ttimestamp: number;\n\t\t\tpromise: IntentResponse<T, D>;\n\t\t}\n\t>();\n\tprivate abortController = new AbortController();\n\tprivate intentDebounce: {\n\t\ttarget: Element;\n\t\ttimeout: ReturnType<typeof setTimeout>;\n\t} | null = null;\n\tconstructor(private config: SpeculatorConfig<T, D>) {\n\t\tthis.registerEvents();\n\t\tthis.handleOptimisticPrefetch();\n\t}\n\t/**\n\t * Registers all required events\n\t */\n\tprivate registerEvents() {\n\t\tfor (const target of this.normaliseTargets(this.config.elements)) {\n\t\t\ttarget.addEventListener(\"mouseover\", this.mouseOverEventHandler, {\n\t\t\t\tsignal: this.abortController.signal,\n\t\t\t});\n\t\t\ttarget.addEventListener(\"click\", this.clickEventHandler, {\n\t\t\t\tsignal: this.abortController.signal,\n\t\t\t});\n\t\t}\n\t}\n\t/**\n\t * The target mouseover event handler\n\t */\n\tprivate mouseOverEventHandler = (e: Event) => {\n\t\tif (!validConnection()) return;\n\t\tconst target = e.target as Element;\n\t\tconst cacheKey = this.getCacheKey(target);\n\t\tif (!cacheKey) return;\n\n\t\tif (this.intentDebounce && this.intentDebounce.target !== target) {\n\t\t\tclearTimeout(this.intentDebounce.timeout);\n\t\t\tthis.intentDebounce = null;\n\t\t}\n\n\t\tif (!this.intentDebounce) {\n\t\t\tthis.intentDebounce = {\n\t\t\t\ttarget,\n\t\t\t\ttimeout: setTimeout(() => {\n\t\t\t\t\tthis.prefetch(target);\n\t\t\t\t\tthis.intentDebounce = null;\n\t\t\t\t}, this.hoverDelay),\n\t\t\t};\n\t\t}\n\t};\n\t/**\n\t * The target click event handler\n\t */\n\tprivate clickEventHandler = async (e: Event) => {\n\t\tconst result = await this.prefetch(e.target as Element);\n\t\tif (this.config.onClick) this.config.onClick(e, result);\n\t};\n\t/**\n\t * Gets a cache key for an element\n\t */\n\tprivate getCacheKey(element: Element): string | null {\n\t\tif (this.config.getCacheKey) {\n\t\t\treturn this.config.getCacheKey(element) ?? null;\n\t\t}\n\t\treturn element.id || null;\n\t}\n\t/**\n\t * Checks if a cached item is stale\n\t */\n\tprivate isStale(timestamp: number): boolean {\n\t\treturn Date.now() - timestamp > this.cacheConfig.staleTime;\n\t}\n\t/**\n\t * Manages the cache size by removing oldest entries when limit is reached\n\t */\n\tprivate manageCacheSize() {\n\t\twhile (this.cache.size >= this.cacheConfig.maxSize) {\n\t\t\tlet oldestKey: string | null = null;\n\t\t\tlet oldestTimestamp = Number.POSITIVE_INFINITY;\n\n\t\t\tfor (const [key, value] of this.cache.entries()) {\n\t\t\t\tif (value.timestamp < oldestTimestamp) {\n\t\t\t\t\toldestTimestamp = value.timestamp;\n\t\t\t\t\toldestKey = key;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif (oldestKey) {\n\t\t\t\tthis.cache.delete(oldestKey);\n\t\t\t}\n\t\t}\n\t}\n\t/**\n\t * Handles optimistic prefetching based on configured strategies\n\t */\n\tprivate handleOptimisticPrefetch() {\n\t\tconst sortedStrategies = [...this.optimisticStrategies].sort(\n\t\t\t(a, b) =>\n\t\t\t\t(a.priority ?? Number.POSITIVE_INFINITY) -\n\t\t\t\t(b.priority ?? Number.POSITIVE_INFINITY),\n\t\t);\n\n\t\tfor (const strategy of sortedStrategies) {\n\t\t\tif (strategy.condition && !strategy.condition()) continue;\n\n\t\t\tconst targets = this.normaliseTargets(strategy.elements);\n\t\t\tfor (const target of targets) {\n\t\t\t\tthis.schedulePrefetch(target);\n\t\t\t}\n\t\t}\n\t}\n\t/**\n\t * Wraps the fetch callback to ensure consistent error handling\n\t */\n\tprivate async executeFetchCallback(element: Element) {\n\t\ttry {\n\t\t\treturn await this.config.fetch(element);\n\t\t} catch (error) {\n\t\t\treturn {\n\t\t\t\terror: {\n\t\t\t\t\tmessage:\n\t\t\t\t\t\terror instanceof Error\n\t\t\t\t\t\t\t? error.message\n\t\t\t\t\t\t\t: \"An unknown error was caught while executing the fetch callback.\",\n\t\t\t\t\texception: error,\n\t\t\t\t},\n\t\t\t\tdata: undefined,\n\t\t\t};\n\t\t}\n\t}\n\t/**\n\t * Scheduels the prefetch for when idle\n\t */\n\tprivate schedulePrefetch(element: Element) {\n\t\tconst prefetch = () => this.prefetch(element);\n\n\t\ttypeof requestIdleCallback !== \"undefined\"\n\t\t\t? requestIdleCallback(prefetch)\n\t\t\t: setTimeout(prefetch, 0);\n\t}\n\t/**\n\t * Normalises a TargetElements value\n\t */\n\tprivate normaliseTargets(elements?: TargetElements) {\n\t\tif (!elements) {\n\t\t\treturn [];\n\t\t}\n\t\tif (elements instanceof NodeList) {\n\t\t\treturn Array.from(elements);\n\t\t}\n\t\tif (Array.isArray(elements)) return elements;\n\t\treturn [elements];\n\t}\n\t/**\n\t * Cache config w/ defaults\n\t */\n\tprivate get cacheConfig() {\n\t\treturn {\n\t\t\tmaxSize: this.config.cache?.maxSize ?? 5,\n\t\t\tstaleTime: this.config.cache?.staleTime ?? 120000,\n\t\t};\n\t}\n\t/**\n\t * Normalises optimistic strategies\n\t */\n\tprivate get optimisticStrategies(): OptimisticPrefetchStrategy[] {\n\t\tif (!this.config.optimistic) {\n\t\t\treturn [];\n\t\t}\n\t\treturn Array.isArray(this.config.optimistic)\n\t\t\t? this.config.optimistic\n\t\t\t: [this.config.optimistic];\n\t}\n\t/**\n\t * Hover delay w/ config\n\t */\n\tprivate get hoverDelay() {\n\t\treturn this.config.hoverDelay ?? 100;\n\t}\n\n\t// ----------------\n\t// Public API\n\n\t/**\n\t * Destroys and resets the Speculator instance\n\t */\n\tpublic destroy() {\n\t\tthis.abortController.abort();\n\t\tthis.clearCache();\n\t\tif (this.intentDebounce) {\n\t\t\tclearTimeout(this.intentDebounce.timeout);\n\t\t\tthis.intentDebounce = null;\n\t\t}\n\t}\n\t/**\n\t * Refreshes the Speculator instance\n\t */\n\tpublic refresh(\n\t\trefreshConfig?: Partial<\n\t\t\tPick<SpeculatorConfig<T, D>, \"elements\" | \"optimistic\">\n\t\t>,\n\t) {\n\t\tif (refreshConfig) {\n\t\t\tthis.config = {\n\t\t\t\t...this.config,\n\t\t\t\t...(refreshConfig.elements && { elements: refreshConfig.elements }),\n\t\t\t\t...(refreshConfig.optimistic && {\n\t\t\t\t\toptimistic: refreshConfig.optimistic,\n\t\t\t\t}),\n\t\t\t};\n\t\t}\n\n\t\tthis.destroy();\n\t\tthis.abortController = new AbortController();\n\t\tthis.registerEvents();\n\t\tthis.handleOptimisticPrefetch();\n\t}\n\t/**\n\t * Prefetch fetch callback for a given element.\n\t */\n\tpublic async prefetch(element: Element) {\n\t\tconst cacheKey = this.getCacheKey(element);\n\n\t\t//* return cache if it exists and not stale\n\t\tif (cacheKey) {\n\t\t\tconst cached = this.cache.get(cacheKey);\n\t\t\tif (cached && !this.isStale(cached.timestamp)) {\n\t\t\t\treturn cached.promise;\n\t\t\t}\n\t\t}\n\n\t\tconst promise = this.executeFetchCallback(element);\n\n\t\t//* cache and manage cache size\n\t\tif (cacheKey) {\n\t\t\tthis.manageCacheSize();\n\t\t\tthis.cache.set(cacheKey, {\n\t\t\t\ttimestamp: Date.now(),\n\t\t\t\tpromise,\n\t\t\t});\n\t\t}\n\n\t\treturn promise;\n\t}\n\t/**\n\t * Prefetch multiple elements at once\n\t */\n\tpublic async prefetchAll(elements: Element[] | NodeListOf<Element>) {\n\t\tconst elementArray = Array.from(elements);\n\t\treturn Promise.all(elementArray.map((element) => this.prefetch(element)));\n\t}\n\t/**\n\t * Clears a cache entry. If no element is provided, clears entire cache\n\t */\n\tpublic clearCache(element?: Element): void {\n\t\tif (!element) {\n\t\t\tthis.cache.clear();\n\t\t\treturn;\n\t\t}\n\n\t\tconst cacheKey = this.getCacheKey(element);\n\t\tif (cacheKey) this.cache.delete(cacheKey);\n\t}\n}\n\nexport default Speculator;\n"]}