voluptasmollitia/docs-exp/performance.performancetrace.record.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/performance](./performance.md) &gt; [PerformanceTrace](./performance.performancetrace.md) &gt; [record](./performance.performancetrace.record.md)

## PerformanceTrace.record() method

Records a trace from given parameters. This provides a direct way to use trace without a need to start/stop. This is useful for use cases in which the trace cannot directly be used (e.g. if the duration was captured before the Performance SDK was loaded).

<b>Signature:</b>

```typescript
record(startTime: number, duration: number, options?: {
        metrics?: {
            [key: string]: number;
        };
        attributes?: {
            [key: string]: string;
        };
    }): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  startTime | number | trace start time since epoch in millisec. |
|  duration | number | The duraction of the trace in millisec. |
|  options | { metrics?: { \[key: string\]: number; }; attributes?: { \[key: string\]: string; }; } | An object which can optionally hold maps of custom metrics and custom attributes. |

<b>Returns:</b>

void