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* webcontainer.ts — Full Node.js runtime in the browser via WebContainer API.\n *\n * Bugs fixed vs original:\n * #1 mount() overwriting tree on every write → now: first call mounts, subsequent calls use fs.writeFile/mkdir\n * #2 exec read-loop could hang past the deadline → now: race each read against timeout + kill signal\n * #3 server-ready listener leaked on timeout → now: unsubscribes in both resolve and reject paths\n * #4 boot failure poisoned the cached promise forever → now: clears _wcBootPromise on error so retry works\n * #5 no cwd on exec → now: optional cwd param forwarded to wc.spawn\n * #6 no way to know if COOP/COEP missing → now: webcontainer_isolation_status tool\n * #7 no listdir / no delete → now: wcLsTool, wcRmTool\n * #8 output was tail-only with no head option → now: keep_head option + configurable cap\n */\nimport { tool } from '@strands-agents/sdk'\nimport { z } from 'zod'\n\nlet _wc: any = null\nlet _wcBootPromise: Promise | null = null\nlet _mounted = false // tracks whether initial mount has happened\n\n// Persistent cache of every server-ready event we've seen.\n// The event fires ONCE per server.listen() call, so we must remember it.\ntype ServerInfo = { port: number; url: string; seen_at: number }\nconst _servers = new Map() // port -> info\nconst _pendingServerResolvers: Array<(info: ServerInfo) => void> = []\nlet _serverListenerInstalled = false\n\nfunction installServerListener(wc: any) {\n if (_serverListenerInstalled) return\n _serverListenerInstalled = true\n try {\n wc.on('server-ready', (port: number, url: string) => {\n const info: ServerInfo = { port, url, seen_at: Date.now() }\n _servers.set(port, info)\n // Wake any pending webcontainer_server_ready callers.\n while (_pendingServerResolvers.length > 0) {\n const resolve = _pendingServerResolvers.shift()\n try { resolve?.(info) } catch {}\n }\n })\n } catch (err) {\n console.warn('[webcontainer] failed to install server-ready listener:', err)\n _serverListenerInstalled = false\n }\n}\n\nasync function getWC() {\n if (_wc) return _wc\n if (_wcBootPromise) return _wcBootPromise\n _wcBootPromise = (async () => {\n // Pre-flight: surface actionable error when cross-origin isolation is missing.\n if (typeof window !== 'undefined' && (window as any).crossOriginIsolated === false) {\n throw new Error(\n 'WebContainer requires cross-origin isolation (window.crossOriginIsolated === false). ' +\n 'Ensure the COOP/COEP service worker (coi-serviceworker.js) has registered and reload the page.'\n )\n }\n const mod: any = await import('@webcontainer/api')\n const wc = await mod.WebContainer.boot()\n _wc = wc\n // Install the global server-ready listener IMMEDIATELY so we never miss events.\n installServerListener(wc)\n return wc\n })().catch((err) => {\n _wcBootPromise = null // CLEAR on failure so retry is possible\n throw err\n })\n return _wcBootPromise\n}\n\n// --- Isolation check (call this FIRST when debugging) -----------------------\n\nexport const wcIsolationTool = tool({\n name: 'webcontainer_isolation_status',\n description:\n 'Check if the page has cross-origin isolation needed for WebContainer. Returns crossOriginIsolated, SharedArrayBuffer availability, and a diagnosis.',\n inputSchema: z.object({}),\n callback: async () => {\n try {\n const isolated = typeof window !== 'undefined' ? (window as any).crossOriginIsolated : false\n const hasSAB = typeof SharedArrayBuffer !== 'undefined'\n const isSecure = typeof window !== 'undefined' ? window.isSecureContext : false\n const diagnosis = isolated && hasSAB\n ? 'READY: WebContainer can boot.'\n : !isSecure\n ? 'Page is not in a secure context (HTTPS / localhost required).'\n : !hasSAB\n ? 'SharedArrayBuffer unavailable — COEP header missing or blocked.'\n : 'Cross-origin isolation not yet active. Reload the page once after coi-serviceworker registers.'\n return JSON.stringify({\n status: 'success',\n crossOriginIsolated: isolated,\n hasSharedArrayBuffer: hasSAB,\n isSecureContext: isSecure,\n diagnosis,\n fix: isolated ? null : {\n dev: 'vite.config.ts should set server.headers for COOP/COEP (already done in this repo)',\n prod: 'coi-serviceworker.js must be loaded in index.html BEFORE any module scripts',\n },\n })\n } catch (err: unknown) {\n return JSON.stringify({ status: 'error', error: (err as Error).message })\n }\n },\n})\n\n// --- Boot -------------------------------------------------------------------\n\nexport const wcBootTool = tool({\n name: 'webcontainer_boot',\n description: 'Boot the WebContainer (in-browser Node.js runtime). Call once before other wc_* tools. Retryable on failure.',\n inputSchema: z.object({}),\n callback: async () => {\n try {\n const wc = await getWC()\n return JSON.stringify({\n status: 'success',\n booted: true,\n workdir: wc.workdir ?? null,\n already_mounted: _mounted,\n hint: 'Use webcontainer_write_files to mount your project, then webcontainer_exec to run commands.',\n })\n } catch (err: unknown) {\n return JSON.stringify({\n status: 'error',\n error: (err as Error).message,\n hint: 'Run webcontainer_isolation_status first. If crossOriginIsolated is false, reload the page.',\n })\n }\n },\n})\n\n// --- Write (merge-safe) -----------------------------------------------------\n\nfunction buildTree(files: Record) {\n const tree: any = {}\n for (const [path, content] of Object.entries(files)) {\n const parts = path.split('/').filter(Boolean)\n if (parts.some((p) => p === '..' || p === '.')) {\n throw new Error(`Illegal path segment in \"${path}\"`)\n }\n let cur = tree\n for (let i = 0; i < parts.length - 1; i++) {\n const seg = parts[i]\n cur[seg] = cur[seg] || { directory: {} }\n cur = cur[seg].directory\n }\n cur[parts[parts.length - 1]] = { file: { contents: content } }\n }\n return tree\n}\n\nexport const wcWriteTool = tool({\n name: 'webcontainer_write_files',\n description:\n 'Write files into the WebContainer filesystem. Map of relative path → content, e.g. {\"package.json\": \"...\", \"src/index.js\": \"...\"}. ' +\n 'First call bulk-mounts; subsequent calls merge individual files (do NOT overwrite the whole tree).',\n inputSchema: z.object({\n files: z.record(z.string(), z.string()).describe('Map of relative path to file content'),\n }),\n callback: async (input) => {\n try {\n const wc = await getWC()\n const entries = Object.entries(input.files)\n if (entries.length === 0) return JSON.stringify({ status: 'success', written: 0 })\n\n if (!_mounted) {\n // Initial bulk mount — fast path\n const tree = buildTree(input.files)\n await wc.mount(tree)\n _mounted = true\n } else {\n // Merge mode — write files individually so we don't blow away existing state\n for (const [path, content] of entries) {\n const parts = path.split('/').filter(Boolean)\n if (parts.some((p) => p === '..' || p === '.')) {\n throw new Error(`Illegal path segment in \"${path}\"`)\n }\n if (parts.length > 1) {\n const dir = parts.slice(0, -1).join('/')\n try { await wc.fs.mkdir(dir, { recursive: true }) } catch {}\n }\n await wc.fs.writeFile(path, content)\n }\n }\n return JSON.stringify({ status: 'success', written: entries.length, mode: _mounted ? 'merge' : 'mount' })\n } catch (err: unknown) {\n return JSON.stringify({ status: 'error', error: (err as Error).message })\n }\n },\n})\n\n// --- Exec -------------------------------------------------------------------\n\nexport const wcExecTool = tool({\n name: 'webcontainer_exec',\n description:\n 'Run a shell command in the WebContainer. Example: {\"cmd\":\"npm\",\"args\":[\"install\"]}. Captures stdout/stderr with a hard timeout. ' +\n 'Default timeout is 120s (npm install is slow on first boot). Set keep_head=true to capture first 4KB instead of last.',\n inputSchema: z.object({\n cmd: z.string().describe('Executable, e.g. \"npm\", \"node\", \"ls\", \"cat\"'),\n args: z.array(z.string()).optional(),\n cwd: z.string().optional().describe('Working directory inside the container (e.g. \"src\", \"packages/api\")'),\n timeout_ms: z.number().optional().describe('Default 120000 (2 min)'),\n keep_head: z.boolean().optional().describe('Keep first 4KB of output instead of last 4KB (useful for install errors)'),\n max_output: z.number().optional().describe('Output cap in bytes. Default 4000'),\n }),\n callback: async (input) => {\n try {\n const wc = await getWC()\n const spawnOpts = input.cwd ? { cwd: input.cwd } : undefined\n const proc = await wc.spawn(input.cmd, input.args || [], spawnOpts)\n\n const timeout = input.timeout_ms ?? 120_000\n const maxOut = input.max_output ?? 4000\n let out = ''\n let killed = false\n const killProc = () => { if (!killed) { killed = true; try { proc.kill() } catch {} } }\n\n // Global deadline — if hit, kill the process\n const deadlineTimer = setTimeout(killProc, timeout)\n\n // Drain output. Race each read against the \"killed\" signal so we never hang.\n const reader = proc.output.getReader()\n const drainPromise = (async () => {\n try {\n while (true) {\n const result = await Promise.race([\n reader.read(),\n new Promise<{ done: true; value: undefined }>((r) => {\n // If the process is killed, break the loop.\n const check = setInterval(() => {\n if (killed) { clearInterval(check); r({ done: true, value: undefined }) }\n }, 50)\n }),\n ])\n if (result.done) break\n const chunk = typeof result.value === 'string' ? result.value : String(result.value ?? '')\n out += chunk\n }\n } catch {}\n try { reader.releaseLock() } catch {}\n })()\n\n const code: number = await Promise.race([\n proc.exit,\n new Promise((r) => setTimeout(() => { killProc(); r(-1) }, timeout)),\n ])\n\n clearTimeout(deadlineTimer)\n // Give the drain a brief window to flush, but don't block forever.\n await Promise.race([drainPromise, new Promise((r) => setTimeout(r, 150))])\n\n const truncated = out.length > maxOut\n const snippet = truncated\n ? (input.keep_head ? out.slice(0, maxOut) : out.slice(-maxOut))\n : out\n\n return JSON.stringify({\n status: code === 0 ? 'success' : 'error',\n exitCode: code,\n output: snippet,\n truncated,\n full_length: out.length,\n timed_out: code === -1,\n cwd: input.cwd ?? null,\n })\n } catch (err: unknown) {\n return JSON.stringify({\n status: 'error',\n error: (err as Error).message,\n hint: (err as Error).message.includes('not found') ? 'Did you run webcontainer_write_files and npm install first?' : undefined,\n })\n }\n },\n})\n\n// --- Read -------------------------------------------------------------------\n\nexport const wcReadTool = tool({\n name: 'webcontainer_read',\n description: 'Read a file from the WebContainer filesystem.',\n inputSchema: z.object({\n path: z.string().describe('Relative path, e.g. \"package.json\"'),\n }),\n callback: async (input) => {\n try {\n const wc = await getWC()\n const content = await wc.fs.readFile(input.path, 'utf-8')\n return JSON.stringify({ status: 'success', path: input.path, content })\n } catch (err: unknown) {\n return JSON.stringify({ status: 'error', error: (err as Error).message })\n }\n },\n})\n\n// --- List & Delete (new) ----------------------------------------------------\n\nexport const wcLsTool = tool({\n name: 'webcontainer_ls',\n description: 'List directory entries in the WebContainer. Returns file + directory names.',\n inputSchema: z.object({\n path: z.string().optional().describe('Directory path (default \".\")'),\n }),\n callback: async (input) => {\n try {\n const wc = await getWC()\n const entries = await wc.fs.readdir(input.path ?? '.', { withFileTypes: true })\n return JSON.stringify({\n status: 'success',\n path: input.path ?? '.',\n entries: entries.map((e: any) => ({\n name: e.name,\n type: e.isDirectory?.() ? 'dir' : 'file',\n })),\n })\n } catch (err: unknown) {\n return JSON.stringify({ status: 'error', error: (err as Error).message })\n }\n },\n})\n\nexport const wcRmTool = tool({\n name: 'webcontainer_rm',\n description: 'Delete a file or directory from the WebContainer filesystem. Set recursive=true to delete directories.',\n inputSchema: z.object({\n path: z.string().describe('Path to remove'),\n recursive: z.boolean().optional(),\n }),\n callback: async (input) => {\n try {\n const wc = await getWC()\n await wc.fs.rm(input.path, { recursive: input.recursive ?? false, force: true })\n return JSON.stringify({ status: 'success', removed: input.path })\n } catch (err: unknown) {\n return JSON.stringify({ status: 'error', error: (err as Error).message })\n }\n },\n})\n\n// --- Server ready (cache-backed, never misses events) ----------------------\n\nexport const wcServerReadyTool = tool({\n name: 'webcontainer_server_ready',\n description:\n 'Get the preview URL for a dev server running inside the container. ' +\n 'If a port was already bound, returns its URL immediately from cache. ' +\n 'Otherwise waits for the next server-ready event up to timeout_ms. ' +\n 'Pass port=N to wait for a specific port only.',\n inputSchema: z.object({\n port: z.number().optional().describe('Specific port to wait for. If omitted, returns any running server or waits for the next one.'),\n timeout_ms: z.number().optional().describe('Default 60000. Set to 0 to only check cache (no wait).'),\n }),\n callback: async (input) => {\n try {\n const wc = await getWC()\n // Ensure listener is installed even if boot happened in a weird path.\n installServerListener(wc)\n\n // Cache hit: specific port requested and already running.\n if (input.port !== undefined && _servers.has(input.port)) {\n const info = _servers.get(input.port)!\n return JSON.stringify({ status: 'success', url: info.url, port: info.port, from_cache: true })\n }\n // Cache hit: any port, and at least one is running → return the most recent.\n if (input.port === undefined && _servers.size > 0) {\n const all = Array.from(_servers.values()).sort((a, b) => b.seen_at - a.seen_at)\n const info = all[0]\n return JSON.stringify({\n status: 'success',\n url: info.url,\n port: info.port,\n from_cache: true,\n all_servers: all.map(s => ({ port: s.port, url: s.url })),\n })\n }\n\n const timeout = input.timeout_ms ?? 60_000\n if (timeout === 0) {\n return JSON.stringify({ status: 'error', error: 'No servers running and timeout_ms=0 (cache-only mode).' })\n }\n\n const info = await new Promise((resolve, reject) => {\n let timer: any\n const waiter = (s: ServerInfo) => {\n if (input.port !== undefined && s.port !== input.port) {\n // Wrong port — keep waiting.\n _pendingServerResolvers.push(waiter)\n return\n }\n clearTimeout(timer)\n resolve(s)\n }\n _pendingServerResolvers.push(waiter)\n timer = setTimeout(() => {\n // Remove our waiter from the queue so it doesn't leak.\n const idx = _pendingServerResolvers.indexOf(waiter)\n if (idx !== -1) _pendingServerResolvers.splice(idx, 1)\n reject(new Error(\n input.port !== undefined\n ? `Timeout waiting for port ${input.port}. Currently running: ${Array.from(_servers.keys()).join(', ') || 'none'}`\n : 'Timeout waiting for server-ready. Did your server actually listen()?'\n ))\n }, timeout)\n })\n\n return JSON.stringify({ status: 'success', url: info.url, port: info.port, from_cache: false })\n } catch (err: unknown) {\n return JSON.stringify({ status: 'error', error: (err as Error).message })\n }\n },\n})\n\n// --- List running servers (new) ---------------------------------------------\n\nexport const wcServersListTool = tool({\n name: 'webcontainer_servers_list',\n description: 'List all servers currently running inside the WebContainer (returns port + URL for each).',\n inputSchema: z.object({}),\n callback: async () => {\n try {\n await getWC() // ensures listener is installed\n const all = Array.from(_servers.values()).sort((a, b) => b.seen_at - a.seen_at)\n return JSON.stringify({\n status: 'success',\n count: all.length,\n servers: all.map(s => ({\n port: s.port,\n url: s.url,\n seen_at: new Date(s.seen_at).toISOString(),\n })),\n })\n } catch (err: unknown) {\n return JSON.stringify({ status: 'error', error: (err as Error).message })\n }\n },\n})\n\n// --- Spawn background process (fire-and-forget, returns immediately) --------\n\nexport const wcSpawnTool = tool({\n name: 'webcontainer_spawn',\n description:\n 'Start a long-running process in the WebContainer (like `node server.js` or `npm run dev`) without blocking. ' +\n 'Returns immediately after the first 2s of output or on listen. Use this for dev servers — do NOT use webcontainer_exec. ' +\n 'After calling this, use webcontainer_server_ready to get the preview URL.',\n inputSchema: z.object({\n cmd: z.string(),\n args: z.array(z.string()).optional(),\n cwd: z.string().optional(),\n wait_ms: z.number().optional().describe('How long to wait for initial output before returning. Default 2000.'),\n }),\n callback: async (input) => {\n try {\n const wc = await getWC()\n installServerListener(wc)\n const spawnOpts = input.cwd ? { cwd: input.cwd } : undefined\n const proc = await wc.spawn(input.cmd, input.args || [], spawnOpts)\n const waitMs = input.wait_ms ?? 2000\n\n let out = ''\n const reader = proc.output.getReader()\n // Drain output into `out` for the wait window, then return without blocking.\n const drain = (async () => {\n try {\n while (true) {\n const { value, done } = await reader.read()\n if (done) break\n out += typeof value === 'string' ? value : String(value ?? '')\n }\n } catch {}\n })()\n // NOTE: we don't await drain — it continues in the background.\n // We also don't release the reader; letting it keep pulling keeps the stream flowing.\n void drain\n\n // Give the process a window to boot / print / call listen().\n await new Promise((r) => setTimeout(r, waitMs))\n\n return JSON.stringify({\n status: 'success',\n spawned: true,\n cmd: input.cmd,\n args: input.args || [],\n initial_output: out.slice(-2000),\n hint: 'Process is running in the background. Call webcontainer_server_ready to get the preview URL.',\n })\n } catch (err: unknown) {\n return JSON.stringify({ status: 'error', error: (err as Error).message })\n }\n },\n})\n\nexport const WEBCONTAINER_TOOLS = [\n wcIsolationTool,\n wcBootTool,\n wcWriteTool,\n wcExecTool,\n wcSpawnTool, // NEW: fire-and-forget for long-running processes\n wcServersListTool, // NEW: list all running servers\n wcReadTool,\n wcLsTool,\n wcRmTool,\n wcServerReadyTool,\n]\n"]}