{"version":3,"sources":["../src/preload.ts"],"sourcesContent":["export type FarmPreloadMode = \"warn\" | \"enforce\";\n\nexport interface FarmPreloadUserConfig {\n /** Report excess hints or remove the lower-priority hints. @default \"enforce\" */\n mode?: FarmPreloadMode;\n /** Maximum image preload hints per document. @default 1 */\n maxImages?: number;\n /** Maximum font preload hints per document. @default 2 */\n maxFonts?: number;\n}\n\nexport interface ResolvedFarmPreloadConfig {\n mode: FarmPreloadMode;\n maxImages: number;\n maxFonts: number;\n}\n\nexport interface FarmPerformanceConfig {\n preload?: FarmPreloadUserConfig;\n}\n\nexport interface ResolvedFarmPerformanceConfig {\n preload: ResolvedFarmPreloadConfig;\n}\n\nexport type FarmPreloadKind = \"image\" | \"font\";\n\nexport interface FarmPreloadBudgetWarning {\n kind: FarmPreloadKind;\n count: number;\n budget: number;\n removed: number;\n}\n\nexport interface FarmManagedPreloads {\n value: string;\n warnings: FarmPreloadBudgetWarning[];\n}\n\nexport interface FarmManagedDocumentPreloads {\n html: string;\n linkHeader: string;\n warnings: FarmPreloadBudgetWarning[];\n}\n\nconst DEFAULT_PRELOAD_CONFIG: ResolvedFarmPreloadConfig = {\n mode: \"enforce\",\n maxImages: 1,\n maxFonts: 2,\n};\n\nconst reportedWarnings = new Map();\nconst PRELOAD_WARNING_TTL_MS = 60_000;\nconst MAX_REPORTED_PRELOAD_WARNINGS = 256;\n\nexport function resolveFarmPerformanceConfig(\n config: FarmPerformanceConfig | undefined,\n): ResolvedFarmPerformanceConfig {\n return {\n preload: {\n mode: config?.preload?.mode === \"warn\" ? \"warn\" : \"enforce\",\n maxImages: normalizeBudget(config?.preload?.maxImages, DEFAULT_PRELOAD_CONFIG.maxImages),\n maxFonts: normalizeBudget(config?.preload?.maxFonts, DEFAULT_PRELOAD_CONFIG.maxFonts),\n },\n };\n}\n\n/**\n * Apply image and font budgets to HTML preload elements. High-priority image\n * hints are retained before ordinary hints, making an explicitly preloaded LCP\n * image the winner when a document contains too many React-generated hints.\n */\nexport function manageFarmHtmlPreloads(\n html: string,\n config: ResolvedFarmPreloadConfig,\n): FarmManagedPreloads {\n const elements = findHtmlLinkElements(html);\n const candidates = elements.flatMap((element, index) => {\n const kind = getHtmlPreloadKind(element.value);\n return kind\n ? [\n {\n index,\n kind,\n highPriority:\n readHtmlAttribute(element.value, \"fetchpriority\")?.toLowerCase() === \"high\",\n },\n ]\n : [];\n });\n\n const budget = selectPreloadsWithinBudget(candidates, config);\n if (config.mode === \"warn\" || budget.removed.size === 0) {\n return { value: html, warnings: budget.warnings };\n }\n\n return {\n value: removeHtmlLinkElements(html, elements, budget.removed),\n warnings: budget.warnings,\n };\n}\n\n/** Apply the same budgets to HTTP Link preload hints, including Farm fonts. */\nexport function manageFarmLinkHeaderPreloads(\n value: string,\n config: ResolvedFarmPreloadConfig,\n): FarmManagedPreloads {\n if (!value) return { value, warnings: [] };\n\n const links = splitLinkHeader(value);\n const candidates = links.flatMap((link, index) => {\n const kind = getLinkHeaderPreloadKind(link);\n return kind\n ? [\n {\n index,\n kind,\n highPriority: getLinkHeaderParameter(link, \"fetchpriority\")?.toLowerCase() === \"high\",\n },\n ]\n : [];\n });\n const budget = selectPreloadsWithinBudget(candidates, config);\n\n return {\n value:\n config.mode === \"enforce\"\n ? links.filter((_, index) => !budget.removed.has(index)).join(\", \")\n : value,\n warnings: budget.warnings,\n };\n}\n\n/** Apply a single document budget across HTML and HTTP Link header hints. */\nexport function manageFarmDocumentPreloads(\n html: string,\n linkHeader: string,\n config: ResolvedFarmPreloadConfig,\n): FarmManagedDocumentPreloads {\n const elements = findHtmlLinkElements(html);\n const links = linkHeader ? splitLinkHeader(linkHeader) : [];\n const headerOffset = elements.length;\n const candidates: PreloadCandidate[] = [];\n\n for (const [index, element] of elements.entries()) {\n const kind = getHtmlPreloadKind(element.value);\n if (!kind) continue;\n candidates.push({\n index,\n kind,\n highPriority: readHtmlAttribute(element.value, \"fetchpriority\")?.toLowerCase() === \"high\",\n });\n }\n for (const [index, link] of links.entries()) {\n const kind = getLinkHeaderPreloadKind(link);\n if (!kind) continue;\n candidates.push({\n index: headerOffset + index,\n kind,\n highPriority: getLinkHeaderParameter(link, \"fetchpriority\")?.toLowerCase() === \"high\",\n });\n }\n\n const budget = selectPreloadsWithinBudget(candidates, config);\n if (config.mode === \"warn\" || budget.removed.size === 0) {\n return { html, linkHeader, warnings: budget.warnings };\n }\n\n return {\n html: removeHtmlLinkElements(html, elements, budget.removed),\n linkHeader: links.filter((_, index) => !budget.removed.has(headerOffset + index)).join(\", \"),\n warnings: budget.warnings,\n };\n}\n\n/** Rate-limit identical route-and-budget warnings within a server process. */\nexport function reportFarmPreloadWarnings(\n warnings: FarmPreloadBudgetWarning[],\n context = \"the rendered document\",\n): void {\n const now = Date.now();\n for (const [key, reportedAt] of reportedWarnings) {\n if (now - reportedAt >= PRELOAD_WARNING_TTL_MS) reportedWarnings.delete(key);\n }\n\n for (const warning of warnings) {\n const key = `${context}:${warning.kind}:${warning.count}:${warning.budget}:${warning.removed}`;\n const reportedAt = reportedWarnings.get(key);\n if (reportedAt !== undefined && now - reportedAt < PRELOAD_WARNING_TTL_MS) continue;\n reportedWarnings.set(key, now);\n while (reportedWarnings.size > MAX_REPORTED_PRELOAD_WARNINGS) {\n const oldest = reportedWarnings.keys().next().value;\n if (oldest === undefined) break;\n reportedWarnings.delete(oldest);\n }\n\n const action = warning.removed > 0 ? ` Removed ${warning.removed} lower-priority hint(s).` : \"\";\n const recommendation =\n warning.kind === \"image\"\n ? ' Mark only the LCP image with `preload` or `fetchPriority=\"high\"`.'\n : \" Set `preload: false` on fonts that are not required above the fold.\";\n console.warn(\n `[Farm.js] ${context} emitted ${warning.count} ${warning.kind} preload hints ` +\n `(budget: ${warning.budget}).${action}${recommendation}`,\n );\n }\n}\n\nexport function clearReportedFarmPreloadWarnings(): void {\n reportedWarnings.clear();\n}\n\ninterface PreloadCandidate {\n index: number;\n kind: FarmPreloadKind;\n highPriority: boolean;\n}\n\nfunction selectPreloadsWithinBudget(\n candidates: PreloadCandidate[],\n config: ResolvedFarmPreloadConfig,\n): { removed: Set; warnings: FarmPreloadBudgetWarning[] } {\n const removed = new Set();\n const warnings: FarmPreloadBudgetWarning[] = [];\n\n for (const kind of [\"image\", \"font\"] as const) {\n const matching = candidates.filter((candidate) => candidate.kind === kind);\n const limit = kind === \"image\" ? config.maxImages : config.maxFonts;\n if (matching.length <= limit) continue;\n\n const retained = new Set(\n [...matching]\n .sort(\n (left, right) =>\n Number(right.highPriority) - Number(left.highPriority) || left.index - right.index,\n )\n .slice(0, limit)\n .map((candidate) => candidate.index),\n );\n\n if (config.mode === \"enforce\") {\n for (const candidate of matching) {\n if (!retained.has(candidate.index)) removed.add(candidate.index);\n }\n }\n\n warnings.push({\n kind,\n count: matching.length,\n budget: limit,\n removed: config.mode === \"enforce\" ? matching.length - retained.size : 0,\n });\n }\n\n return { removed, warnings };\n}\n\nfunction getHtmlPreloadKind(link: string): FarmPreloadKind | undefined {\n const rel = readHtmlAttribute(link, \"rel\")?.toLowerCase().split(/\\s+/) || [];\n if (!rel.includes(\"preload\")) return undefined;\n return normalizePreloadKind(readHtmlAttribute(link, \"as\"));\n}\n\nfunction getLinkHeaderPreloadKind(link: string): FarmPreloadKind | undefined {\n const relations = getLinkHeaderParameter(link, \"rel\")?.toLowerCase().split(/\\s+/) ?? [];\n if (!relations.includes(\"preload\")) return undefined;\n return normalizePreloadKind(getLinkHeaderParameter(link, \"as\"));\n}\n\nfunction getLinkHeaderParameter(link: string, name: string): string | undefined {\n const uriEnd = link.indexOf(\">\");\n if (uriEnd === -1) return undefined;\n\n for (const parameter of splitLinkParameters(link.slice(uriEnd + 1))) {\n const separator = parameter.indexOf(\"=\");\n const parameterName = (separator === -1 ? parameter : parameter.slice(0, separator))\n .trim()\n .toLowerCase();\n if (parameterName !== name.toLowerCase() || separator === -1) continue;\n const rawValue = parameter.slice(separator + 1).trim();\n if (rawValue.startsWith('\"') && rawValue.endsWith('\"')) {\n return rawValue.slice(1, -1).replace(/\\\\([\\\\\"])/g, \"$1\");\n }\n return rawValue;\n }\n return undefined;\n}\n\nfunction splitLinkParameters(value: string): string[] {\n const parameters: string[] = [];\n let start = 0;\n let quoted = false;\n for (let index = 0; index < value.length; index += 1) {\n const character = value[index];\n if (character === '\"' && !isEscaped(value, index)) quoted = !quoted;\n else if (character === \";\" && !quoted) {\n const parameter = value.slice(start, index).trim();\n if (parameter) parameters.push(parameter);\n start = index + 1;\n }\n }\n const parameter = value.slice(start).trim();\n if (parameter) parameters.push(parameter);\n return parameters;\n}\n\nfunction normalizePreloadKind(value: string | undefined): FarmPreloadKind | undefined {\n const normalized = value?.toLowerCase();\n return normalized === \"image\" || normalized === \"font\" ? 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