feat(vitest-plugin): add dynamic startInstruments function

packages/vitest-plugin/src/index.ts

@@ -1,4 +1,10 @@
-import { getV8Flags, Measurement } from "@codspeed/core";
+import {
+  getV8Flags,
+  Measurement,
+  mongoMeasurement,
+  SetupInstrumentsRequestBody,
+  SetupInstrumentsResponse,
+} from "@codspeed/core";
 import { join } from "path";
 import { Plugin } from "vite";
 import { UserConfig } from "vitest/config";
@@ -45,3 +51,18 @@ export default function codspeedPlugin(): Plugin {
     },
   };
 }
+
+/**
+ * Dynamically setup the CodSpeed instruments.
+ */
+export async function setupInstruments(
+  body: SetupInstrumentsRequestBody
+): Promise<SetupInstrumentsResponse> {
+  if (!Measurement.isInstrumented()) {
+    console.warn("[CodSpeed] No instrumentation found, using default mongoUrl");
+
+    return { remoteAddr: body.mongoUrl };
+  }
+
+  return await mongoMeasurement.setupInstruments(body);
+}