Initial Commit

packages/api-stack/api/api-openapi/tests/setup/polyfills.ts

@@ -0,0 +1,34 @@
+/**
+ * Test-environment setup for @suaveplan/api-openapi.
+ *
+ * Wires a real in-memory OpenTelemetry `MeterProvider` BEFORE any source
+ * module is imported. Tests that inspect emitted metrics can read them
+ * from `testInMemoryMetricExporter`. Node ≥18 exposes `crypto.subtle`
+ * and `crypto.getRandomValues` globally, so no crypto polyfill needed.
+ */
+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() {
+    await testMeterProvider.forceFlush();
+    const collected = testInMemoryMetricExporter.getMetrics();
+    testInMemoryMetricExporter.reset();
+    return collected;
+}