init commit

shared/metrics-8/src/impression-snapshot-provider.ts

@@ -0,0 +1,27 @@
+import type {
+    MetricsFieldsBuilder,
+    MetricsFieldsContext,
+    MetricsFieldsProvider,
+} from '@jet/engine';
+import { IMPRESSION_CONTEXT_NAME } from './impressions/constants';
+import type { Impressions } from './impressions';
+
+export class ImpressionSnapshotFieldProvider implements MetricsFieldsProvider {
+    constructor(private readonly appContext: Map<string, unknown>) {
+        this.appContext = appContext;
+    }
+
+    addMetricsFields(
+        builder: MetricsFieldsBuilder,
+        _metricsContext: MetricsFieldsContext,
+    ) {
+        const impressionInstance = this.appContext.get(
+            IMPRESSION_CONTEXT_NAME,
+        ) as Impressions;
+
+        if (impressionInstance?.settings?.captureType === 'jet') {
+            let impressions = impressionInstance.captureSnapshotImpression();
+            builder.addValue(impressions, 'impressions');
+        }
+    }
+}