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1. Create init file

Create a tuskDriftInit.ts file to initialize the Tusk Drift SDK. 
import { TuskDrift } from "@use-tusk/drift-node-sdk";

// Initialize SDK immediately
TuskDrift.initialize({
  apiKey: process.env.TUSK_DRIFT_API_KEY,
  env: process.env.NODE_ENV,
});

export { TuskDrift };

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Initialization Parameters

OptionTypeDefaultDescription
apiKeystringRequired if using Tusk CloudYour Tusk Drift API key.
envstringprocess.env.NODE_ENVThe environment name.
logLevel’silent’ | ‘error’ | ‘warn’ | ‘info’ | ‘debug''info’The logging level.

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2. Import SDK at application entry point

In your main server file (e.g., server.ts, index.ts, app.ts), import this file at the very top before any other imports. This ensures proper instrumentation of all dependencies. 
// server.ts (or index.ts/app.ts)
import { TuskDrift } from "./tdInit"; // MUST be the first import

// ... other imports ...

// Your application setup ...

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3. Update recording configurations

Update the configuration file .tusk/config.yaml to include a recording section. Example recording configuration: 
# ... existing configuration ...

recording:
  sampling_rate: 0.1
  export_spans: true
  enable_env_var_recording: true

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Configuration Options

OptionTypeDefaultDescription
sampling_ratenumber1.0The sampling rate (0.0 - 1.0). 1.0 means 100% of requests are recorded, 0.0 means 0% of requests are recorded.
export_spansbooleanfalseWhether to export spans to Tusk backend or local files (.tusk/traces). If false, spans are only exported to local files.
enable_env_var_recordingbooleanfalseWhether to enable environment variable recording and replaying. Recommended if your application’s business logic depends on environment variables, as this ensures the most accurate replay behavior.

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4. Mark the app as ready

Once your application is ready to accept requests, mark it as ready: 
// server.ts
import { TuskDrift } from "./tuskDriftInit";

// ... other imports ...

const app = express();

// Your application setup...

app.listen(8000, () => {
  // Mark app as ready for recording/replay
  TuskDrift.markAppAsReady();
  console.log("Server started and ready for Tusk Drift");
});
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