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The TypeScript SDK supports multiple authentication methods for different use cases.

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Bearer Token (App-Only Auth)

For read-only operations and public data access:
quickstart.ts
import { 
  Client, 
  type ClientConfig,
  type Users
} from '@xdevplatform/xdk';

const config: ClientConfig = { bearerToken: 'your-bearer-token' };

const client: Client = new Client(config);

async function main(): Promise<void> {
  const userResponse: Users.GetByUsernameResponse = await client.users.getByUsername('XDevelopers');
  const username: string = userResponse.data?.username!;
  console.log(username);
}

main();

​
OAuth 1.0a (User Context)

For legacy applications or specific use cases:
oauth1.ts
import { 
  Client, 
  OAuth1,
  type OAuth1Config,
  type ClientConfig,
  type Users
} from '@xdevplatform/xdk';

const oauth1Config: OAuth1Config = {
  apiKey: 'your-api-key',
  apiSecret: 'your-api-secret',
  accessToken: 'user-access-token',
  accessTokenSecret: 'user-access-token-secret'
};

const oauth1: OAuth1 = new OAuth1(oauth1Config);

const config: ClientConfig = {
  oauth1: oauth1,
};

const client: Client = new Client(config);

async function main(): Promise<void> {
  const response: Users.GetMeResponse = await client.users.getMe();

  const me = response.data;
  console.log(me);
}

main();

​
OAuth 2.0 (User Context)

For user-specific operations:
oauth2.ts
import { 
  Client, 
  OAuth2,
  generateCodeVerifier,
  generateCodeChallenge,
  type OAuth2Config,
  type ClientConfig,
  type OAuth2Token
} from '@xdevplatform/xdk';

(async (): Promise<void> => {
  const oauth2Config: OAuth2Config = {
    clientId: 'your-client-id',
    clientSecret: 'your-client-secret',
    redirectUri: 'https://example.com',
    scope: ['tweet.read', 'users.read', 'offline.access'],
  };

  const oauth2: OAuth2 = new OAuth2(oauth2Config);

  const state: string = 'example-state';
  const codeVerifier: string = generateCodeVerifier();
  const codeChallenge: string = await generateCodeChallenge(codeVerifier);
  
  oauth2.setPkceParameters(codeVerifier, codeChallenge);
  
  const authUrl: string = await oauth2.getAuthorizationUrl(state);

  const tokens: OAuth2Token = await oauth2.exchangeCode(authCode, codeVerifier);

  const config: ClientConfig = {
    accessToken: tokens.access_token,
  };

  const client: Client = new Client(config);
});

​
Environment Variables

Store sensitive credentials in environment variables: 
# .env
X_API_BEARER_TOKEN=your-bearer-token
X_API_CLIENT_ID=your-client-id
X_API_CLIENT_SECRET=your-client-secret
env.ts
import { Client } from '@xdevplatform/xdk';

const client = new Client({ bearerToken: process.env.X_API_BEARER_TOKEN });