Initial Commit

packages/communication/messaging/notification-channel/tests/setup/polyfills.ts

@@ -0,0 +1,38 @@
+/**
+ * Test-environment setup for @suaveplan/notification-channel.
+ *
+ * Wires a real in-memory OpenTelemetry `MeterProvider` BEFORE any source
+ * module loads so the meter resolved at module load is the real provider's
+ * meter (and not the no-op fallback). Tests that inspect emitted instruments
+ * read them out of `testInMemoryMetricExporter` via `flushTestMetrics()`.
+ *
+ * Universal: no `node:fs`, no `process.cwd()`, no DOM globals.
+ */
+import { metrics } from "@opentelemetry/api";
+import {
+    AggregationTemporality,
+    InMemoryMetricExporter,
+    MeterProvider,
+    PeriodicExportingMetricReader,
+} from "@opentelemetry/sdk-metrics";
+
+export const testInMemoryMetricExporter = new InMemoryMetricExporter(
+    AggregationTemporality.CUMULATIVE
+);
+
+const reader = new PeriodicExportingMetricReader({
+    exporter: testInMemoryMetricExporter,
+    exportIntervalMillis: 60_000,
+});
+
+export const testMeterProvider = new MeterProvider({ readers: [reader] });
+metrics.setGlobalMeterProvider(testMeterProvider);
+
+export async function flushTestMetrics(): Promise<
+    ReturnType<typeof testInMemoryMetricExporter.getMetrics>
+> {
+    await testMeterProvider.forceFlush();
+    const collected = testInMemoryMetricExporter.getMetrics();
+    testInMemoryMetricExporter.reset();
+    return collected;
+}