Vercel AI SDK chat UI components

For vendors outside the OpenAI-compat family (Anthropic, Google, Bedrock, 25+ more), bridge the Vercel AI SDK. You bring your @ai-sdk/* package and hand its model to createAiSdkProvider; the bridge maps streamText’s output to aparté’s event stream.

npm install @aparte/provider-ai-sdk @aparte/core ai @ai-sdk/anthropic

ai is a peer dependency pinned to the verified major (^7) — this bridge is the only aparté module that touches the SDK’s types.

import { createAnthropic } from '@ai-sdk/anthropic';
import { createAiSdkProvider } from '@aparte/provider-ai-sdk';
import { aparteGlobalConfig, AparteDirectTransport } from '@aparte/core';

aparteGlobalConfig.registerAIProvider(createAiSdkProvider({
  id: 'anthropic',
  name: 'Anthropic',
  models: [{ id: 'claude-sonnet-4-5', name: 'Claude Sonnet 4.5' }],
  languageModel: (modelId, auth) =>
    createAnthropic({
      apiKey: typeof auth === 'string' ? auth : auth?.apiKey,
      headers: { 'anthropic-dangerous-direct-browser-access': 'true' }, // BYOK from the browser
    })(modelId),
}));

aparteGlobalConfig.setTransport(new AparteDirectTransport({ byok: true }));

The languageModel factory receives the model id and the key/config your key-resolver produced — rebuild the vendor provider per call for UI-driven BYOK, or ignore auth if your factory already carries the key. The bridge owns its I/O through the SDK and honours the abort signal, so a user “stop” cancels the underlying vendor call.

The options object is AiSdkProviderOptions. The bridge also exports its four shaping functions on their own — toModelMessages, toToolSet, toToolChoice, fullStreamToAparteEvents — which is what turns a server you already have into an aparté backend: Keep the key server-side. That route is yours to write, so the redaction is too: fullStreamToAparteEvents forwards the SDK’s error part with the vendor’s own prose, and a vendor 401 quotes your key’s prefix, tail and format — rewrite the error event to a fixed message before it leaves your server, as the guide’s route does.