f

package.json

@@ -39,7 +39,7 @@
     "test": "npm run lint -- --fix && vitest run",
     "test-keepalive": "cross-env TEST_KEEPALIVE_COUNT=50 vitest run --test-timeout 180000 keep-alive-header.test.ts",
     "test-node16": "node examples/httpclient.cjs && node examples/search_github.cjs && node examples/timing.cjs",
-    "cov": "cross-env NODE_OPTIONS='--loader=./test/patch-structuredClone.mjs' vitest run --coverage",
+    "cov": "cross-env NODE_OPTIONS='--require ./test/patch-structuredClone.cjs' vitest run --coverage",
     "ci": "npm run lint && npm run cov && npm run prepublishOnly && npm pack && attw --pack",
     "clean": "rm -rf dist",
     "prepublishOnly": "npm run build"

test/patch-structuredClone.cjs

@@ -0,0 +1,7 @@
+const structuredClone = require('@ungap/structured-clone').default;
+
+// vitest require structuredClone
+if (!('structuredClone' in globalThis)) {
+  globalThis.structuredClone = structuredClone;
+  // console.debug('patched structuredClone for Node.js %s', process.version);
+}