Browser Compatibility

import { createKeyPersistence } from '@frontmcp/utils';

// Auto-detect best backend
const store = createKeyPersistence();

// Explicit backend
const indexedDbStore = createKeyPersistence({ type: 'indexeddb' });
const localStorageStore = createKeyPersistence({ type: 'localstorage' });

import { IndexedDBStorageAdapter, LocalStorageAdapter, MemoryStorageAdapter } from '@frontmcp/utils';

// IndexedDB — best for structured data, large values
const idb = new IndexedDBStorageAdapter({ dbName: 'my-app', storeName: 'state' });

// localStorage — simpler, synchronous-friendly
const ls = new LocalStorageAdapter({ prefix: 'my-app:' });

// Memory — ephemeral, works everywhere
const mem = new MemoryStorageAdapter();

import { OpenAIAdapter, AnthropicAdapter } from '@frontmcp/sdk';

// OpenAI — requires `npm install openai`
const openai = new OpenAIAdapter({
  model: 'gpt-4o',
  apiKey: 'sk-...',
});

// Anthropic — requires `npm install @anthropic-ai/sdk`
const anthropic = new AnthropicAdapter({
  model: 'claude-sonnet-4-20250514',
  apiKey: 'sk-ant-...',
});

import {
  sha256Hex,
  generateCodeVerifier,
  generateCodeChallenge,
  encryptAesGcm,
  decryptAesGcm,
  randomBytes,
  randomUUID,
  base64urlEncode,
  base64urlDecode,
} from '@frontmcp/utils';

// All of these work identically in both environments
const hash = await sha256Hex('data');
const verifier = generateCodeVerifier();
const challenge = await generateCodeChallenge(verifier);