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// rw-r--r--\nexport const DEFAULT_DIR_MODE = 0o040755; // rwxr-xr-x\n\n/** Root inode number */\nexport const ROOT_INO = 1;\n\n/** Default chunk size in bytes */\nexport const DEFAULT_CHUNK_SIZE = 4096;\n\nexport interface Inode {\n ino: number;\n mode: number;\n nlink: number;\n uid: number;\n gid: number;\n size: number;\n atime: number;\n mtime: number;\n ctime: number;\n rdev: number;\n atime_nsec: number;\n mtime_nsec: number;\n ctime_nsec: number;\n}\n\nexport interface DirEntry {\n id: number;\n name: string;\n parent_ino: number;\n ino: number;\n}\n\nexport interface StatResult {\n ino: number;\n mode: number;\n nlink: number;\n uid: number;\n gid: number;\n size: number;\n atime: number;\n mtime: number;\n ctime: number;\n rdev: number;\n atime_nsec: number;\n mtime_nsec: number;\n ctime_nsec: number;\n}\n\n// ─── Key-Value Store ─────────────────────────────────────────────────\n\nexport interface KVEntry {\n key: string;\n value: string;\n created_at: number;\n updated_at: number;\n}\n\n// ─── Helpers ─────────────────────────────────────────────────────────\n\n/** Checks whether a mode value represents a directory */\nexport function isDir(mode: number): boolean {\n return (mode & S_IFMT) === S_IFDIR;\n}\n\n/** Checks whether a mode value represents a regular file */\nexport function isFile(mode: number): boolean {\n return (mode & S_IFMT) === S_IFREG;\n}\n\n/** Checks whether a mode value represents a symlink */\nexport function isSymlink(mode: number): boolean {\n return (mode & S_IFMT) === S_IFLNK;\n}\n","createdAt",["D",1775283940460],"branchVersion","branchId","0efb5874-2fed-11f1-ad2f-42dde27851f2","id","0efaa3f2-2fed-11f1-ad2f-42dde27851f2","agentfs",["D",1775283063025],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","A virtual filesystem for AI agents, backed by SQLite.","imageUrl","5d1042a9-7b0b-499d-8a72-3a8ac7a4e185","pinnedFileId","pinPreview","pinMigrated","screenshotVersion","likeCount",1,"orgId","5f80108f-7ca4-4327-b77b-089dbe4b5a82","tursoName","0efaa3f22fed11f1ad2f42dde27851f2","tursoHostname","0efaa3f22fed11f1ad2f42dde27851f2-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789470042795],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_95":94,"_102":98},"org",{"_95":94,"_96":-5,"_97":98,"_18":52,"_99":100,"_101":24},"branch",{"_13":84,"_31":85,"_40":39,"_86":41,"_87":-5,"_88":-5,"_89":-5,"_90":-5,"_91":-5,"_92":42,"_93":94},"isOwned",55,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","nbbaier","handle","displayName","avatar","https://secure.gravatar.com/avatar/0129a541b7b3574e92c4afd06c5e32da&d=identicon","tier","pro","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_40":41,"_31":42,"_35":163,"_44":-5,"_45":24,"_46":47,"_48":47,"_49":50,"_51":-5,"_18":52,"_53":-5,"_54":24,"_55":-5,"_56":-5,"_57":58,"_59":60,"_61":62,"_63":64,"_65":164,"_67":-5,"_68":69,"_70":69,"_71":72,"_73":72,"_74":72,"_75":69,"_76":69,"_77":165,"_79":166,"_81":167,"_83":24},"tree",[154,155],"files",[154,155],"counts",{"_144":132,"_145":58,"_146":132,"_147":148,"_149":150},"contents",[126,127],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles",true,"grants","orgs","customDomains",{},{"_40":135,"_31":136,"_29":137,"_129":-5,"_38":39,"_37":138,"_130":24,"_35":139,"_13":140,"_32":141,"_33":142,"_23":24,"_133":-5,"_26":143},{"_40":128,"_31":27,"_29":30,"_129":-5,"_38":39,"_37":14,"_130":121,"_35":131,"_13":132,"_32":20,"_33":34,"_23":24,"_133":-5,"_26":134},"19f9a47c-2fef-11f1-8163-42dde27851f2","parentId","latest",["D",1775283940460],0,"label",[27],"44ec17f2-2fed-11f1-bb17-42dde27851f2","main.ts","0efdef3a-2fed-11f1-ad2f-42dde27851f2",5,["D",1775283153516],4,"http","/**\n * AgentFS × Val Town PoC\n *\n * Implements a DatabasePromise adapter for Val Town's native SQLite,\n * then uses AgentFS.openWith() to run the full AgentFS SDK against it.\n *\n * Run as an HTTP val to see results.\n */\n\nimport { sqlite } from \"https://esm.town/v/std/sqlite\";\nimport { AgentFS } from \"https://esm.sh/agentfs-sdk\";\n\n// ─── Val Town SQLite → DatabasePromise adapter ───────────────────────\n\n/**\n * Deferred statement that bridges the sync prepare() / async execute() gap.\n *\n * DatabasePromise.prepare() must return synchronously, but Val Town's\n * sqlite.execute() is always async. We store the SQL and defer execution\n * to run/get/all — which are already async in AgentFS internals.\n */\nclass ValTownStatement {\n private sql: string;\n private _raw = false;\n private _pluck = false;\n\n constructor(sql: string) {\n this.sql = sql;\n }\n\n raw(toggle?: boolean): this {\n this._raw = toggle !== false;\n return this;\n }\n\n pluck(toggle?: boolean): this {\n this._pluck = toggle !== false;\n return this;\n }\n\n safeIntegers(_toggle?: boolean): this {\n return this; // Val Town doesn't support BigInt mode\n }\n\n columns(): any[] {\n throw new Error(\"columns() not supported in Val Town adapter\");\n }\n\n get source(): void {\n return undefined;\n }\n get reader(): void {\n return undefined;\n }\n get database(): any {\n return undefined;\n }\n\n /**\n * Convert a result set to the format AgentFS expects.\n *\n * Val Town sqlite.execute returns { columns: string[], rows: any[][] }.\n * - Default (raw=false): return objects keyed by column name\n * - raw=true: return arrays\n * - pluck=true: return first column value only\n */\n private formatRows(columns: string[], rows: any[][]): any[] {\n if (this._pluck) {\n return rows.map((row) => row[0]);\n }\n if (this._raw) {\n return rows;\n }\n // Object mode (default for better-sqlite3 compat)\n return rows.map((row) =>\n Object.fromEntries(columns.map((col, i) => [col, row[i]]))\n );\n }\n\n async run(\n ...args: any[]\n ): Promise<{ changes: number; lastInsertRowid: number }> {\n const result = await sqlite.execute({\n sql: this.sql,\n args: args.flat(),\n });\n return {\n changes: result.rowsAffected ?? 0,\n lastInsertRowid: Number(result.lastInsertRowid ?? 0),\n };\n }\n\n async get(...args: any[]): Promise {\n const result = await sqlite.execute({\n sql: this.sql,\n args: args.flat(),\n });\n const formatted = this.formatRows(result.columns ?? [], result.rows ?? []);\n return formatted[0] ?? undefined;\n }\n\n async all(...args: any[]): Promise {\n const result = await sqlite.execute({\n sql: this.sql,\n args: args.flat(),\n });\n return this.formatRows(result.columns ?? [], result.rows ?? []);\n }\n\n async *iterate(...args: any[]): AsyncGenerator {\n const rows = await this.all(...args);\n for (const row of rows) {\n yield row;\n }\n }\n\n bind(..._args: any[]): this {\n throw new Error(\"bind() not supported — pass parameters to run/get/all\");\n }\n\n interrupt(): void {}\n close(): void {}\n}\n\nfunction notSupported(name: string): () => never {\n return () => {\n throw new Error(`${name}() is not supported in Val Town adapter`);\n };\n}\n\n/**\n * Create a DatabasePromise-compatible wrapper around Val Town's sqlite.\n *\n * This is the equivalent of agentfs-sdk/serverless's createServerlessAdapter,\n * but targeting Val Town's @val-town/sqlite instead of @tursodatabase/serverless.\n */\nfunction createValTownAdapter() {\n return {\n name: \"valtown\",\n readonly: false,\n open: true,\n memory: false,\n inTransaction: false,\n\n async connect(): Promise {\n await sqlite.execute(\"SELECT 1\");\n },\n\n prepare(sql: string): ValTownStatement {\n return new ValTownStatement(sql);\n },\n\n transaction(fn: (...args: any[]) => Promise) {\n // Val Town doesn't expose interactive transactions, so we\n // use batch() with BEGIN/COMMIT framing. For the PoC we\n // fall back to just running the function — AgentFS's own\n // transactions are mostly schema init + single writes.\n return (...bindParameters: any[]) => fn(...bindParameters);\n },\n\n async exec(sql: string): Promise {\n // exec() can contain multiple statements separated by ;\n // Val Town's sqlite.batch handles this pattern\n const statements = sql\n .split(\";\")\n .map((s) => s.trim())\n .filter((s) => s.length > 0);\n\n if (statements.length === 1) {\n await sqlite.execute(statements[0]);\n } else {\n await sqlite.batch(statements.map((s) => ({ sql: s, args: [] })));\n }\n },\n\n pragma(): Promise {\n throw new Error(\"pragma() not supported in Val Town\");\n },\n\n backup: notSupported(\"backup\"),\n serialize: notSupported(\"serialize\"),\n function: notSupported(\"function\"),\n aggregate: notSupported(\"aggregate\"),\n table: notSupported(\"table\"),\n loadExtension: notSupported(\"loadExtension\"),\n maxWriteReplicationIndex: notSupported(\"maxWriteReplicationIndex\"),\n interrupt: notSupported(\"interrupt\"),\n\n defaultSafeIntegers(_toggle?: boolean) {},\n\n async close(): Promise {\n // Val Town manages connection lifecycle\n },\n } as any; // cast to DatabasePromise\n}\n\n// ─── PoC: exercise AgentFS against Val Town SQLite ───────────────────\n\nexport default async function handler(req: Request): Promise {\n const results: string[] = [];\n const log = (msg: string) => results.push(msg);\n\n try {\n // 1. Create adapter and open AgentFS\n log(\"→ Creating Val Town adapter...\");\n const db = createValTownAdapter();\n\n log(\"→ Opening AgentFS with openWith()...\");\n const agent = await AgentFS.openWith(db);\n log(\"✓ AgentFS opened successfully\");\n\n // 2. Test KV store\n log(\"\\n--- Key-Value Store ---\");\n await agent.kv.set(\"test:greeting\", { message: \"hello from val town\" });\n log(\"✓ kv.set() succeeded\");\n\n const greeting = await agent.kv.get(\"test:greeting\");\n log(`✓ kv.get() → ${JSON.stringify(greeting)}`);\n\n await agent.kv.set(\"test:counter\", 42);\n const counter = await agent.kv.get(\"test:counter\");\n log(`✓ kv counter → ${counter}`);\n\n const keys = await agent.kv.list(\"test:\");\n log(`✓ kv.list(\"test:\") → ${keys.length} entries`);\n\n // 3. Test filesystem\n log(\"\\n--- Filesystem ---\");\n await agent.fs.writeFile(\"/hello.txt\", \"Hello from AgentFS on Val Town!\");\n log(\"✓ fs.writeFile() succeeded\");\n\n const content = await agent.fs.readFile(\"/hello.txt\", \"utf-8\");\n log(`✓ fs.readFile() → \"${content}\"`);\n\n const exists = await agent.fs.exists(\"/hello.txt\");\n log(`✓ fs.exists() → ${exists}`);\n\n await agent.fs.writeFile(\"/docs/notes.md\", \"# Notes\\n\\nSome notes here.\");\n const dirEntries = await agent.fs.readdir(\"/\");\n log(`✓ fs.readdir(\"/\") → [${dirEntries.join(\", \")}]`);\n\n // 4. Test tool call tracking\n log(\"\\n--- Tool Calls ---\");\n const now = Date.now() / 1000;\n const toolId = await agent.tools.record(\n \"web_search\",\n now,\n now + 0.5,\n { query: \"val town agentfs\" },\n { results: [\"result1\", \"result2\"] },\n );\n log(`✓ tools.record() → id=${toolId}`);\n\n const toolCall = await agent.tools.get(toolId);\n log(\n `✓ tools.get() → name=\"${toolCall?.name}\", params=${\n JSON.stringify(toolCall?.parameters)\n }`,\n );\n\n // 5. 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Diff · v6