feat(sdk): AI SDK chat transport — run useChat as tasks

.changeset/ai-sdk-chat-transport.md

@@ -0,0 +1,41 @@
+---
+"@trigger.dev/ai": minor
+---
+
+New package: `@trigger.dev/ai` — AI SDK integration for Trigger.dev
+
+Provides `TriggerChatTransport`, a custom `ChatTransport` implementation for the Vercel AI SDK that bridges `useChat` with Trigger.dev's durable task execution and realtime streams.
+
+**Frontend usage:**
+```tsx
+import { useChat } from "@ai-sdk/react";
+import { TriggerChatTransport } from "@trigger.dev/ai";
+
+const { messages, sendMessage } = useChat({
+  transport: new TriggerChatTransport({
+    accessToken: publicAccessToken,
+    taskId: "my-chat-task",
+  }),
+});
+```
+
+**Backend task:**
+```ts
+import { task, streams } from "@trigger.dev/sdk";
+import { streamText, convertToModelMessages } from "ai";
+import type { ChatTaskPayload } from "@trigger.dev/ai";
+
+export const myChatTask = task({
+  id: "my-chat-task",
+  run: async (payload: ChatTaskPayload) => {
+    const result = streamText({
+      model: openai("gpt-4o"),
+      messages: convertToModelMessages(payload.messages),
+    });
+    const { waitUntilComplete } = streams.pipe("chat", result.toUIMessageStream());
+    await waitUntilComplete();
+  },
+});
+```
+
+Also exports `createChatTransport()` factory function and `ChatTaskPayload` type for task-side typing.

packages/ai/package.json

@@ -0,0 +1,74 @@
+{
+  "name": "@trigger.dev/ai",
+  "version": "4.3.3",
+  "description": "AI SDK integration for Trigger.dev - Custom ChatTransport for running AI chat as durable tasks",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/triggerdotdev/trigger.dev",
+    "directory": "packages/ai"
+  },
+  "type": "module",
+  "files": [
+    "dist"
+  ],
+  "tshy": {
+    "selfLink": false,
+    "main": true,
+    "module": true,
+    "project": "./tsconfig.json",
+    "exports": {
+      "./package.json": "./package.json",
+      ".": "./src/index.ts"
+    },
+    "sourceDialects": [
+      "@triggerdotdev/source"
+    ]
+  },
+  "scripts": {
+    "clean": "rimraf dist .tshy .tshy-build .turbo",
+    "build": "tshy && pnpm run update-version",
+    "dev": "tshy --watch",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest",
+    "update-version": "tsx ../../scripts/updateVersion.ts",
+    "check-exports": "attw --pack ."
+  },
+  "dependencies": {
+    "@trigger.dev/core": "workspace:4.3.3"
+  },
+  "peerDependencies": {
+    "ai": "^5.0.0 || ^6.0.0"
+  },
+  "devDependencies": {
+    "@arethetypeswrong/cli": "^0.15.4",
+    "ai": "^6.0.0",
+    "rimraf": "^3.0.2",
+    "tshy": "^3.0.2",
+    "tsx": "4.17.0",
+    "vitest": "^2.1.0"
+  },
+  "engines": {
+    "node": ">=18.20.0"
+  },
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": {
+        "@triggerdotdev/source": "./src/index.ts",
+        "types": "./dist/esm/index.d.ts",
+        "default": "./dist/esm/index.js"
+      },
+      "require": {
+        "types": "./dist/commonjs/index.d.ts",
+        "default": "./dist/commonjs/index.js"
+      }
+    }
+  },
+  "main": "./dist/commonjs/index.js",
+  "types": "./dist/commonjs/index.d.ts",
+  "module": "./dist/esm/index.js"
+}

packages/ai/src/index.ts

@@ -0,0 +1,3 @@
+export { TriggerChatTransport, createChatTransport } from "./transport.js";
+export type { TriggerChatTransportOptions, ChatTaskPayload } from "./types.js";
+export { VERSION } from "./version.js";