diff --git a/packages/babel-helper-transform-fixture-test-runner/src/index.ts b/packages/babel-helper-transform-fixture-test-runner/src/index.ts
index 50a2421548fe..abb4bce5c9ad 100644
--- a/packages/babel-helper-transform-fixture-test-runner/src/index.ts
+++ b/packages/babel-helper-transform-fixture-test-runner/src/index.ts
@@ -20,24 +20,6 @@ const require = createRequire(import.meta.url);
 
 import checkDuplicateNodes from "@babel/helper-check-duplicate-nodes";
 
-if (!process.env.BABEL_8_BREAKING) {
-  // Introduced in Node.js 10
-  if (!assert.rejects) {
-    assert.rejects = async function (promise, validateError) {
-      try {
-        await promise;
-        return Promise.reject(new Error("Promise not rejected"));
-      } catch (error) {
-        if (!validateError(error)) {
-          return Promise.reject(
-            new Error("Promise rejected with invalid error"),
-          );
-        }
-      }
-    };
-  }
-}
-
 const EXTERNAL_HELPERS_VERSION = "7.100.0";
 
 const cachedScripts = new QuickLRU<
@@ -521,22 +503,20 @@ export default function (
               // the options object with useless options
               delete task.options.throws;
 
-              await assert.rejects(run(task), function (err: Error) {
-                assert.ok(
-                  throwMsg === true || err.message.includes(throwMsg),
-                  `
+              await assert.rejects(
+                () => run(task),
+                (err: Error) => {
+                  assert.ok(
+                    throwMsg === true || err.message.includes(throwMsg),
+                    `
 Expected Error: ${throwMsg}
 Actual Error: ${err.message}`,
-                );
-                return true;
-              });
+                  );
+                  return true;
+                },
+              );
             } else {
-              const result = await run(task);
-              if (task.exec.code) {
-                if (result && typeof result.then === "function") {
-                  return result;
-                }
-              }
+              return run(task);
             }
           },
         );