Node VFS

import { createDeepAgent } from "deepagents";
import { ChatAnthropic } from "@langchain/anthropic";
import { VfsSandbox } from "@langchain/node-vfs";

const sandbox = await VfsSandbox.create({
  initialFiles: {
    "/src/index.js": "console.log('Hello from VFS!')",
  },
});

try {
  const agent = createDeepAgent({
    model: new ChatAnthropic({ model: "claude-sonnet-4-20250514" }),
    systemPrompt: "You are a coding assistant with VFS access.",
    backend: sandbox,
  });

  const result = await agent.invoke({
    messages: [{ role: "user", content: "Run the index.js file" }],
  });
} finally {
  await sandbox.stop();
}

import { VfsSandbox } from "@langchain/node-vfs";

const sandbox = await VfsSandbox.create({
  initialFiles: {
    "/src/index.js": "console.log('Hello from VFS!')",
  },
});

const result = await sandbox.execute("node /src/index.js");
console.log(result.output); // "Hello from VFS!"

await sandbox.stop();

// 上传文件
const encoder = new TextEncoder();
await sandbox.uploadFiles([
  ["src/app.js", encoder.encode("console.log('Hi')")],
  ["package.json", encoder.encode('{"name": "test"}')],
]);

// 下载文件
const results = await sandbox.downloadFiles(["src/app.js"]);
for (const result of results) {
  if (result.content) {
    console.log(new TextDecoder().decode(result.content));
  }
}

import { createVfsSandboxFactory, createVfsSandboxFactoryFromSandbox } from "@langchain/node-vfs";

// 为每次调用创建新的沙箱
const factory = createVfsSandboxFactory({
  initialFiles: { "/README.md": "# Hello" },
});

// 或者在多次调用间重用现有沙箱
const sandbox = await VfsSandbox.create();
const reuseFactory = createVfsSandboxFactoryFromSandbox(sandbox);

import { VfsSandboxError } from "@langchain/node-vfs";

try {
  await sandbox.execute("some-command");
} catch (error) {
  if (error instanceof VfsSandboxError) {
    switch (error.code) {
      case "NOT_INITIALIZED":
        // 处理未初始化的沙箱
        break;
      case "COMMAND_TIMEOUT":
        // 处理超时
        break;
    }
  }
}