[Home](./index.md) > [@firebase/performance](./performance.md) > [trace](./performance.trace.md) ## trace() function Returns a new `PerformanceTrace` instance. Signature: ```typescript export declare function trace(performance: FirebasePerformance, name: string): PerformanceTrace; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | performance | [FirebasePerformance](./performance.firebaseperformance.md) | The FirebasePerformance instance to use. | | name | string | The name of the trace. | Returns: [PerformanceTrace](./performance.performancetrace.md)