diff --git a/packages/jest-serializer/src/__tests__/index.test.ts b/packages/jest-serializer/src/__tests__/index.test.ts
index 9a62e10aaee1..f23cf3651525 100644
--- a/packages/jest-serializer/src/__tests__/index.test.ts
+++ b/packages/jest-serializer/src/__tests__/index.test.ts
@@ -18,9 +18,7 @@ import serializer from '..';
 
 const v8s = [
   {
-    // @ts-ignore - Node 8+ only
     deserialize: v8.deserialize,
-    // @ts-ignore - Node 8+ only
     serialize: v8.serialize,
   },
   {
@@ -57,9 +55,7 @@ afterEach(() => {
 v8s.forEach((mockV8, i) => {
   describe('Using V8 implementation ' + i, () => {
     beforeEach(() => {
-      // @ts-ignore - Node 8+ only
       v8.serialize = mockV8.serialize;
-      // @ts-ignore - Node 8+ only
       v8.deserialize = mockV8.deserialize;
     });
 
diff --git a/packages/jest-serializer/src/global.d.ts b/packages/jest-serializer/src/global.d.ts
new file mode 100644
index 000000000000..809c49911f31
--- /dev/null
+++ b/packages/jest-serializer/src/global.d.ts
@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+declare module 'v8' {
+  function serialize(value: unknown): Buffer;
+  function deserialize(value: Buffer): unknown;
+}
diff --git a/packages/jest-serializer/src/index.ts b/packages/jest-serializer/src/index.ts
index 41d415f9c2c5..e2055ef70785 100644
--- a/packages/jest-serializer/src/index.ts
+++ b/packages/jest-serializer/src/index.ts
@@ -114,40 +114,28 @@ function jsonParse(content: string) {
 // In memory functions.
 
 export function deserialize(buffer: Buffer): any {
-  // @ts-ignore - Node 8+ only
   return v8.deserialize
-    ? //
-      // @ts-ignore - Node 8+ only
-      v8.deserialize(buffer)
+    ? v8.deserialize(buffer)
     : jsonParse(buffer.toString('utf8'));
 }
 
 export function serialize(content: unknown): Buffer {
-  // @ts-ignore - Node 8+ only
   return v8.serialize
-    ? //
-      // @ts-ignore - Node 8+ only
-      v8.serialize(content)
+    ? v8.serialize(content)
     : Buffer.from(jsonStringify(content));
 }
 
 // Synchronous filesystem functions.
 
 export function readFileSync(filePath: Path): any {
-  // @ts-ignore - Node 8+ only
   return v8.deserialize
-    ? //
-      // @ts-ignore - Node 8+ only
-      v8.deserialize(fs.readFileSync(filePath))
+    ? v8.deserialize(fs.readFileSync(filePath))
     : jsonParse(fs.readFileSync(filePath, 'utf8'));
 }
 
 export function writeFileSync(filePath: Path, content: any) {
-  // @ts-ignore - Node 8+ only
   return v8.serialize
-    ? //
-      // @ts-ignore - Node 8+ only
-      fs.writeFileSync(filePath, v8.serialize(content))
+    ? fs.writeFileSync(filePath, v8.serialize(content))
     : fs.writeFileSync(filePath, jsonStringify(content), 'utf8');
 }