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* as fs from 'fs/promises';\nimport * as path from 'path';\nimport { createHash } from 'crypto';\n\ninterface CacheEntry {\n content: string;\n contentHash: string;\n url: string;\n cachedAt: string;\n size: number;\n}\n\nexport interface ImmutableCacheOptions {\n inMemory?: boolean;\n}\n\nexport class ImmutableCache {\n private cacheDir?: string;\n private inMemory: boolean;\n private memoryCache: Map;\n \n constructor(projectPath: string, options?: ImmutableCacheOptions) {\n this.inMemory = options?.inMemory || false;\n this.memoryCache = new Map();\n \n if (this.inMemory) {\n // In-memory mode - no filesystem operations\n return;\n }\n \n // In serverless/read-only environments, use /tmp\n // Detect by checking if we're in /var/task (Vercel) or if LAMBDA_TASK_ROOT is set (AWS Lambda)\n const isServerless = projectPath.startsWith('/var/task') || \n process.env.LAMBDA_TASK_ROOT || \n process.env.VERCEL || \n process.env.AWS_LAMBDA_FUNCTION_NAME;\n \n if (isServerless) {\n // Use /tmp which is writable in serverless environments\n this.cacheDir = path.join('/tmp', '.mlld', 'cache', 'imports');\n } else {\n // Store cache in .mlld/cache directory\n this.cacheDir = path.join(projectPath, '.mlld', 'cache', 'imports');\n }\n }\n\n /**\n * Get cached content by URL and hash\n */\n async get(url: string, expectedHash?: string): Promise {\n // In test mode, always return cache miss\n if (process.env.MLLD_TEST === '1') {\n return null;\n }\n \n const urlHash = this.hashUrl(url);\n \n // Handle in-memory mode\n if (this.inMemory) {\n const entry = this.memoryCache.get(urlHash);\n if (!entry) return null;\n \n // If hash provided, verify it matches\n if (expectedHash && entry.contentHash !== expectedHash) {\n return null;\n }\n \n return entry.content;\n }\n \n // Filesystem mode\n const cachePath = path.join(this.cacheDir!, urlHash);\n \n try {\n // Read metadata\n const metaPath = `${cachePath}.meta.json`;\n const metaContent = await fs.readFile(metaPath, 'utf8');\n const meta = JSON.parse(metaContent);\n \n // If hash provided, verify it matches\n if (expectedHash && meta.contentHash !== expectedHash) {\n return null;\n }\n \n // Read cached content\n const content = await fs.readFile(cachePath, 'utf8');\n \n // Verify integrity\n const actualHash = createHash('sha256').update(content, 'utf8').digest('hex');\n if (actualHash !== meta.contentHash) {\n // Cache corrupted, remove it\n await this.remove(url);\n return null;\n }\n \n return content;\n } catch (error) {\n // Cache miss or error\n return null;\n }\n }\n\n /**\n * Store content in cache\n */\n async set(url: string, content: string): Promise {\n // In test mode, skip caching\n if (process.env.MLLD_TEST === '1') {\n return createHash('sha256').update(content, 'utf8').digest('hex');\n }\n \n const urlHash = this.hashUrl(url);\n const contentHash = createHash('sha256').update(content, 'utf8').digest('hex');\n \n // Handle in-memory mode\n if (this.inMemory) {\n const entry: CacheEntry = {\n url,\n content,\n contentHash,\n cachedAt: new Date().toISOString(),\n size: content.length\n };\n this.memoryCache.set(urlHash, entry);\n return contentHash;\n }\n \n // Filesystem mode\n // Ensure cache directory exists\n await fs.mkdir(this.cacheDir!, { recursive: true });\n \n const cachePath = path.join(this.cacheDir!, urlHash);\n \n // Write content\n await fs.writeFile(cachePath, content, 'utf8');\n \n // Write metadata\n const meta = {\n url,\n contentHash,\n cachedAt: new Date().toISOString(),\n size: content.length\n };\n await fs.writeFile(`${cachePath}.meta.json`, JSON.stringify(meta, null, 2));\n \n return contentHash;\n }\n\n /**\n * Remove cached entry\n */\n async remove(url: string): Promise {\n const urlHash = this.hashUrl(url);\n \n // Handle in-memory mode\n if (this.inMemory) {\n this.memoryCache.delete(urlHash);\n return;\n }\n \n // Filesystem mode\n const cachePath = path.join(this.cacheDir!, urlHash);\n \n try {\n await fs.unlink(cachePath);\n await fs.unlink(`${cachePath}.meta.json`);\n } catch {\n // Ignore if doesn't exist\n }\n }\n\n /**\n * Clear entire cache\n */\n async clear(): Promise {\n // Handle in-memory mode\n if (this.inMemory) {\n this.memoryCache.clear();\n return;\n }\n \n // Filesystem mode\n try {\n await fs.rm(this.cacheDir!, { recursive: true, force: true });\n } catch {\n // Ignore if doesn't exist\n }\n }\n\n /**\n * Get cache statistics\n */\n async getStats(): Promise<{\n entries: number;\n totalSize: number;\n urls: string[];\n }> {\n // Handle in-memory mode\n if (this.inMemory) {\n let totalSize = 0;\n const urls: string[] = [];\n \n for (const entry of this.memoryCache.values()) {\n totalSize += entry.size;\n urls.push(entry.url);\n }\n \n return {\n entries: this.memoryCache.size,\n totalSize,\n urls\n };\n }\n \n // Filesystem mode\n try {\n const files = await fs.readdir(this.cacheDir!);\n const metaFiles = files.filter(f => f.endsWith('.meta.json'));\n \n let totalSize = 0;\n const urls: string[] = [];\n \n for (const metaFile of metaFiles) {\n const metaPath = path.join(this.cacheDir!, metaFile);\n const metaContent = await fs.readFile(metaPath, 'utf8');\n const meta = JSON.parse(metaContent);\n \n totalSize += meta.size || 0;\n urls.push(meta.url);\n }\n \n return {\n entries: metaFiles.length,\n totalSize,\n urls\n };\n } catch {\n return {\n entries: 0,\n totalSize: 0,\n urls: []\n };\n }\n }\n\n private hashUrl(url: string): string {\n return createHash('sha256').update(url, 'utf8').digest('hex');\n }\n}"]}