feat: expose the v8 flags from @codspeed/core

CodSpeedHQ · Jun 27, 2023 · 15f2bcb · 15f2bcb
1 parent a2d0d88
commit 15f2bcb
Showing 1 changed file with 26 additions and 0 deletions.
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
@@ -1,3 +1,4 @@
+import { writeFileSync } from "fs";
 import path from "path";
 declare const __VERSION__: string;
 
@@ -33,6 +34,31 @@ export const initCore = () => {
     require("v8").setFlagsFromString("--allow-natives-syntax");
   }
   measurement.stopInstrumentation(`Metadata: codspeed-node ${__VERSION__}`);
+
+  if (process.env.__CODSPEED_NODE_CORE_INTROSPECTION_PATH__ !== undefined) {
+    const nodeVersionMajor = parseInt(process.version.slice(1).split(".")[0]);
+    const flags = [
+      "--hash-seed=1",
+      "--random-seed=1",
+      "--no-opt",
+      "--predictable",
+      "--predictable-gc-schedule",
+    ];
+    if (nodeVersionMajor < 18) {
+      flags.push("--no-randomize-hashes");
+    }
+    if (nodeVersionMajor < 20) {
+      flags.push("--no-scavenge-task");
+    }
+    const introspectionMetadata = {
+      flags,
+    };
+    writeFileSync(
+      process.env.__CODSPEED_NODE_CORE_INTROSPECTION_PATH__,
+      JSON.stringify(introspectionMetadata)
+    );
+    process.exit(213);
+  }
 };
 
 export const optimizeFunction = async (fn: CallableFunction) => {