diff --git a/scripts/build-types/BuildApiSnapshot.js b/scripts/build-types/BuildApiSnapshot.js
index b70d4dff1e0..fe0c7b14ce6 100644
--- a/scripts/build-types/BuildApiSnapshot.js
+++ b/scripts/build-types/BuildApiSnapshot.js
@@ -23,9 +23,11 @@ const {
 } = require('@microsoft/api-extractor');
 const {promises: fs} = require('fs');
 const glob = require('glob');
+const {diff} = require('jest-diff');
 const path = require('path');
 const prettier = require('prettier');
 const osTempDir = require('temp-dir');
+const {styleText} = require('util');
 
 const inputFilesPostTransforms: $ReadOnlyArray<PluginObj<mixed>> = [
   require('./transforms/renameDefaultExportedIdentifiers'),
@@ -37,7 +39,7 @@ const postTransforms: $ReadOnlyArray<PluginObj<mixed>> = [
   require('./transforms/sortUnions'),
 ];
 
-async function buildAPISnapshot() {
+async function buildAPISnapshot(validate: boolean) {
   const tempDirectory = await createTempDir('react-native-js-api-snapshot');
   const packages = await findPackagesWithTypedef();
 
@@ -56,12 +58,23 @@ async function buildAPISnapshot() {
   if (extractorResult.succeeded) {
     const apiSnapshot = apiSnapshotTemplate(
       await getCleanedUpRollup(tempDirectory),
-    );
+    ) as string;
 
-    await fs.writeFile(
-      path.join(REACT_NATIVE_PACKAGE_DIR, 'ReactNativeApi.d.ts'),
-      apiSnapshot,
-    );
+    if (validate) {
+      const prevSnapshot = await fs.readFile(
+        path.join(REACT_NATIVE_PACKAGE_DIR, 'ReactNativeApi.d.ts'),
+        'utf-8',
+      );
+      const hasChanged = await validateSnapshots(prevSnapshot, apiSnapshot);
+      if (hasChanged) {
+        process.exitCode = 1;
+      }
+    } else {
+      await fs.writeFile(
+        path.join(REACT_NATIVE_PACKAGE_DIR, 'ReactNativeApi.d.ts'),
+        apiSnapshot,
+      );
+    }
   } else {
     process.exitCode = 1;
     console.error(
@@ -73,6 +86,32 @@ async function buildAPISnapshot() {
   await fs.rm(tempDirectory, {recursive: true});
 }
 
+async function validateSnapshots(
+  prevSnapshot: string,
+  newSnapshot: string,
+): Promise<boolean> {
+  const hasChanged = newSnapshot !== prevSnapshot;
+  if (hasChanged) {
+    const options = {
+      aAnnotation: 'Previous Snapshot',
+      bAnnotation: 'New Snapshot',
+      expand: false,
+      emptyFirstOrLastLinePlaceholder: '↵',
+      includeChangeCounts: true,
+      aColor: (line: string) => styleText(['red'], line),
+      bColor: (line: string) => styleText(['green'], line),
+    };
+
+    const diffResult = diff(prevSnapshot, newSnapshot, options);
+    console.error(
+      `\n${styleText(['inverse'], ' VALIDATE ')} ReactNativeApi.d.ts has changed. Please re-run \`yarn build-types\` and commit the updated snapshot.\n\n`,
+      diffResult,
+    );
+  }
+
+  return hasChanged;
+}
+
 async function findPackagesWithTypedef() {
   const packagesWithGeneratedTypes = glob
     .sync(`${PACKAGES_DIR}/**/types_generated`, {nodir: false})
diff --git a/scripts/build-types/index.js b/scripts/build-types/index.js
index 388226c7069..cee92641066 100644
--- a/scripts/build-types/index.js
+++ b/scripts/build-types/index.js
@@ -20,12 +20,13 @@ const config = {
     debug: {type: 'boolean'},
     help: {type: 'boolean'},
     withSnapshot: {type: 'boolean'},
+    validate: {type: 'boolean'},
   },
 };
 
 async function main() {
   const {
-    values: {debug: debugEnabled, help, withSnapshot},
+    values: {debug: debugEnabled, help, withSnapshot, validate},
     /* $FlowFixMe[incompatible-call] Natural Inference rollout. See
      * https://fburl.com/workplace/6291gfvu */
   } = parseArgs(config);
@@ -68,7 +69,7 @@ async function main() {
         '\n',
     );
 
-    await buildApiSnapshot();
+    await buildApiSnapshot(validate);
   }
 }