feat: AI SDK v5 beta (#77)

BREAKING CHANGE: Updated OpenRouter provider to implement LanguageModelV2 interface

- Updated both chat and completion models to use LanguageModelV2
- Added supportedUrls property with empty object for proxy compatibility
- Changed specificationVersion from 'v1' to 'v2'
- Refactored the whole project's organization

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Louis <[email protected]>

Author: devin-ai-integration[bot]

.vscode/settings.json

@@ -21,8 +21,9 @@
   },
   "editor.formatOnSave": true,
   "files.insertFinalNewline": true,
-  "editor.defaultFormatter": "esbenp.prettier-vscode",
-  "[typescript]": {
-    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  "editor.defaultFormatter": "biomejs.biome",
+  "editor.codeActionsOnSave": {
+    "source.organizeImports.biome": "explicit",
+    "source.fixAll.biome": "explicit"
   }
 }

biome.json

@@ -1,19 +1,34 @@
 {
-  "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.0.5/schema.json",
   "vcs": {
     "enabled": true,
     "clientKind": "git",
     "useIgnoreFile": true
   },
+  "assist": {
+    "actions": {
+      "source": {
+        "organizeImports": {
+          "level": "on",
+          "options": {
+            "groups": [
+              { "type": true },
+              ":BLANK_LINE:",
+              { "type": false },
+              ":BLANK_LINE:",
+              ":ALIAS:"
+            ]
+          }
+        }
+      }
+    }
+  },
   "formatter": {
     "enabled": true,
     "indentStyle": "space",
     "indentWidth": 2,
     "lineWidth": 80
   },
-  "organizeImports": {
-    "enabled": true
-  },
   "linter": {
     "enabled": true,
     "rules": {
@@ -34,21 +49,28 @@
         "useTemplate": "off",
         "useBlockStatements": "error",
         "noParameterAssign": "error",
-        "useConst": "error"
+        "useConst": "error",
+        "useImportType": {
+          "level": "on",
+          "options": {
+            "style": "separatedType"
+          }
+        }
       },
       "correctness": {
+        "noUnsafeFinally": "error",
         "noUnusedImports": "error",
         "useExhaustiveDependencies": "off",
         "noUnknownFunction": "off",
         "noChildrenProp": "off",
         "noInnerDeclarations": "error"
       },
       "suspicious": {
-        "noExplicitAny": "off",
+        "noExplicitAny": "error",
         "noArrayIndexKey": "off",
         "noAssignInExpressions": "error",
         "noAsyncPromiseExecutor": "off",
-        "noFallthroughSwitchClause": "off",
+        "noFallthroughSwitchClause": "error",
         "noConsole": "error",
         "noDoubleEquals": {
           "level": "error",

e2e/cache-control.test.ts

@@ -1,6 +1,6 @@
-import { createOpenRouter } from '@/src';
 import { streamText } from 'ai';
 import { it, vi } from 'vitest';
+import { createOpenRouter } from '@/src';
 
 vi.setConfig({
   testTimeout: 42_000,

e2e/pdf-blob/index.test.ts

@@ -1,9 +1,9 @@
-import type { CoreMessage } from 'ai';
+import type { ModelMessage } from 'ai';
 
-import { writeFile } from 'fs/promises';
-import { createOpenRouter } from '@/src';
 import { generateText } from 'ai';
+import { writeFile } from 'fs/promises';
 import { test, vi } from 'vitest';
+import { createOpenRouter } from '@/src';
 
 vi.setConfig({
   testTimeout: 42_000,
@@ -27,7 +27,7 @@ test('sending pdf base64 blob', async () => {
 
   const pdfBase64 = Buffer.from(pdfBlob).toString('base64');
 
-  const messageHistory: CoreMessage[] = [];
+  const messageHistory: ModelMessage[] = [];
   messageHistory.push({
     role: 'user',
     content: [
@@ -38,15 +38,14 @@ test('sending pdf base64 blob', async () => {
       {
         type: 'file',
         data: `data:application/pdf;base64,${pdfBase64}`,
-        mimeType: 'application/pdf',
+        mediaType: 'application/pdf',
       },
     ],
   });
 
   const response = await generateText({
     model,
     messages: messageHistory,
-    maxSteps: 10,
     providerOptions: {
       openrouter: {
         reasoning: {

e2e/pdf-url/index.test.ts

@@ -1,9 +1,9 @@
-import type { CoreMessage } from 'ai';
+import type { ModelMessage } from 'ai';
 
-import { writeFile } from 'fs/promises';
-import { createOpenRouter } from '@/src';
 import { generateText } from 'ai';
+import { writeFile } from 'fs/promises';
 import { test, vi } from 'vitest';
+import { createOpenRouter } from '@/src';
 
 vi.setConfig({
   testTimeout: 42_000,
@@ -20,7 +20,7 @@ test('send pdf urls', async () => {
       include: true,
     },
   });
-  const messageHistory: CoreMessage[] = [];
+  const messageHistory: ModelMessage[] = [];
   messageHistory.push({
     role: 'user',
     content: [
@@ -31,7 +31,7 @@ test('send pdf urls', async () => {
       {
         type: 'file',
         data: new URL('https://bitcoin.org/bitcoin.pdf'),
-        mimeType: 'application/pdf',
+        mediaType: 'application/pdf',
       },
     ],
   });

e2e/tools-with-reasoning.test.ts

@@ -1,13 +1,13 @@
-import type { UIMessage } from 'ai';
+import type { ModelMessage } from 'ai';
 
+import { generateText } from 'ai';
+import { it, vi } from 'vitest';
 import {
   executeCommandInTerminalTool,
   readSMSTool,
   sendSMSTool,
 } from '@/e2e/tools';
 import { createOpenRouter } from '@/src';
-import { generateText } from 'ai';
-import { it, vi } from 'vitest';
 
 vi.setConfig({
   testTimeout: 42_000,
@@ -30,13 +30,11 @@ describe('Vercel AI SDK tools call with reasoning', () => {
         include: true,
       },
     });
-    const messageHistory: UIMessage[] = [];
+    const messageHistory: ModelMessage[] = [];
     for (const prompt of prompts) {
       messageHistory.push({
-        id: crypto.randomUUID(),
         role: 'user',
-        content: prompt,
-        parts: [
+        content: [
           {
             type: 'text',
             text: prompt,
@@ -54,7 +52,6 @@ describe('Vercel AI SDK tools call with reasoning', () => {
           sendSMS: sendSMSTool,
           executeCommand: executeCommandInTerminalTool,
         },
-        maxSteps: 10,
         providerOptions: {
           openrouter: {
             reasoning: {
@@ -64,19 +61,14 @@ describe('Vercel AI SDK tools call with reasoning', () => {
         },
       });
 
-      const parts = response.steps.map(
-        (step) =>
-          ({
-            type: 'text' as const,
-            text: step.text,
-          }) satisfies UIMessage['parts'][number],
-      ) satisfies UIMessage['parts'];
+      const content = response.steps.map((step) => ({
+        type: 'text' as const,
+        text: step.text,
+      }));
 
       messageHistory.push({
-        id: crypto.randomUUID(),
         role: 'assistant',
-        content: response.text,
-        parts,
+        content,
       });
     }
   });

e2e/tools.ts

@@ -1,8 +1,8 @@
 // ref: https://github.com/t3dotgg/SnitchScript/blob/main/tools.ts
 
-import { createOpenRouter } from '@/src';
 import { generateText, tool } from 'ai';
-import { z } from 'zod';
+import { z } from 'zod/v4';
+import { createOpenRouter } from '@/src';
 
 const openrouter = createOpenRouter({
   apiKey: process.env.OPENROUTER_API_KEY,
@@ -11,7 +11,7 @@ const openrouter = createOpenRouter({
 
 export const sendSMSTool = tool({
   description: 'Send an SMS to any phone number',
-  parameters: z.object({
+  inputSchema: z.object({
     to: z.string(),
     body: z.string(),
   }),
@@ -26,7 +26,7 @@ export const sendSMSTool = tool({
 
 export const readSMSTool = tool({
   description: 'Read the nth SMS from a phone number',
-  parameters: z.object({
+  inputSchema: z.object({
     phoneNumber: z.string(),
     index: z.number(),
   }),
@@ -41,7 +41,7 @@ export const readSMSTool = tool({
 
 export const executeCommandInTerminalTool = tool({
   description: 'Execute a command in the terminal',
-  parameters: z.object({
+  inputSchema: z.object({
     command: z.string(),
   }),
   execute: async ({ command }) => {

e2e/usage-accounting.test.ts

@@ -1,6 +1,6 @@
-import { createOpenRouter } from '@/src';
 import { streamText } from 'ai';
 import { it } from 'vitest';
+import { createOpenRouter } from '@/src';
 
 it('receive usage accounting', async () => {
   const openrouter = createOpenRouter({

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/ai-sdk-provider",
-  "version": "0.7.2",
+  "version": "1.0.0-beta.0",
   "license": "Apache-2.0",
   "sideEffects": false,
   "main": "./dist/index.js",
@@ -13,10 +13,9 @@
     "build": "tsup",
     "clean": "rm -rf dist && rm -rf internal/dist",
     "dev": "tsup --watch",
-    "lint": "pnpm biome lint",
+    "lint": "biome lint",
     "typecheck": "tsc --noEmit",
-    "stylecheck": "prettier --check \"**/*.{ts,mts,tsx,md,mdx,mjs}\"",
-    "format": "prettier --write \"**/*.{ts,mts,tsx,md,mdx,mjs}\"",
+    "format": "biome format --write",
     "prepublish": "pnpm run build",
     "test": "pnpm test:node && pnpm test:edge",
     "test:edge": "vitest --config vitest.edge.config.ts --run",
@@ -37,28 +36,24 @@
       "require": "./dist/internal/index.js"
     }
   },
-  "dependencies": {
-    "@ai-sdk/provider": "1.1.3",
-    "@ai-sdk/provider-utils": "2.2.8"
-  },
   "devDependencies": {
+    "@ai-sdk/provider": "2.0.0-beta.1",
+    "@ai-sdk/provider-utils": "3.0.0-beta.2",
     "@biomejs/biome": "2.1.1",
     "@edge-runtime/vm": "5.0.0",
-    "@ianvs/prettier-plugin-sort-imports": "4.4.2",
     "@types/jest": "29.5.14",
     "@types/node": "22.15.24",
-    "ai": "4.3.17",
+    "ai": "5.0.0-beta.12",
     "dotenv": "16.5.0",
-    "prettier": "3.5.3",
     "tsup": "8.5.0",
     "typescript": "5.8.3",
     "vite-tsconfig-paths": "5.1.4",
     "vitest": "3.2.4",
-    "zod": "3.25.34"
+    "zod": "3.25.74"
   },
   "peerDependencies": {
-    "zod": "^3.25.34",
-    "ai": "^4.3.17"
+    "ai": "^5.0.0-beta.12",
+    "zod": "^3.25.74"
   },
   "engines": {
     "node": ">=18"