googleapis
@@ -308,6 +308,9 @@ export interface BucketMetadata extends BaseMetadata {
   encryption?: {
     defaultKmsKeyName?: string;
   } | null;
+  hierarchicalNamespace?: {
+    enabled?: boolean;
+  };
   iamConfiguration?: {
     publicAccessPrevention?: string;
     uniformBucketLevelAccess?: {

@@ -124,6 +124,16 @@ export interface CreateBucketRequest {
   customPlacementConfig?: CustomPlacementConfig;
   dra?: boolean;
   enableObjectRetention?: boolean;
+  hierarchicalNamespace?: {
+    enabled?: boolean;
+  };
+  iamConfiguration?: {
+    publicAccessPrevention?: string;
+    uniformBucketLevelAccess?: {
+      enabled?: boolean;
+      lockedTime?: string;
+    };
+  };
   location?: string;
   multiRegional?: boolean;
   nearline?: boolean;
@@ -868,6 +878,7 @@ export class Storage extends Service {
    * @property {boolean} [dra=false] Specify the storage class as Durable Reduced
    *     Availability.
    * @property {boolean} [enableObjectRetention=false] Specifiy whether or not object retention should be enabled on this bucket.
+   * @property {object} [hierarchicalNamespace.enabled=false] Specify whether or not to enable hierarchical namespace on this bucket.
    * @property {string} [location] Specify the bucket's location. If specifying
    *     a dual-region, the `customPlacementConfig` property should be set in conjunction.
    *     For more information, see {@link https://cloud.google.com/storage/docs/locations| Bucket Locations}.

@@ -1512,6 +1512,50 @@ describe('storage', function () {
     });
   });
 
+  describe('bucket hierarchical namespace', async () => {
+    let bucket: Bucket;
+
+    beforeEach(() => {
+      bucket = storage.bucket(generateName());
+    });
+
+    afterEach(async () => {
+      try {
+        await bucket.delete();
+      } catch {
+        //Ignore errors
+      }
+    });
+
+    it('should create a bucket without hierarchical namespace enabled (implicit)', async () => {
+      await storage.createBucket(bucket.name);
+      const [metadata] = await bucket.getMetadata();
+      assert.strictEqual(metadata.hierarchicalNamespace, undefined);
+    });
+
+    it('should create a bucket without hierarchical namespace enabled (explicit)', async () => {
+      await storage.createBucket(bucket.name, {
+        hierarchicalNamespace: {enabled: false},
+      });
+      const [metadata] = await bucket.getMetadata();
+      assert.strictEqual(metadata.hierarchicalNamespace, undefined);
+    });
+
+    it('should create a bucket with hierarchical namespace enabled', async () => {
+      await storage.createBucket(bucket.name, {
+        hierarchicalNamespace: {enabled: true},
+        iamConfiguration: {
+          uniformBucketLevelAccess: {
+            enabled: true,
+          },
+        },
+      });
+      const [metadata] = await bucket.getMetadata();
+      assert(metadata.hierarchicalNamespace);
+      assert.strictEqual(metadata.hierarchicalNamespace.enabled, true);
+    });
+  });
+
   describe('bucket retention policies', () => {
     describe('bucket', () => {
       it('should create a bucket with a retention policy', async () => {

@@ -923,6 +923,21 @@ describe('Storage', () => {
       storage.createBucket(BUCKET_NAME, {enableObjectRetention: true}, done);
     });
 
+    it('should allow enabling hierarchical namespace', done => {
+      storage.request = (
+        reqOpts: DecorateRequestOptions,
+        callback: Function
+      ) => {
+        assert.strictEqual(reqOpts.json.hierarchicalNamespace.enabled, true);
+        callback();
+      };
+      storage.createBucket(
+        BUCKET_NAME,
+        {hierarchicalNamespace: {enabled: true}},
+        done
+      );
+    });
+
     describe('storage classes', () => {
       it('should expand metadata.archive', done => {
         storage.request = (reqOpts: DecorateRequestOptions) => {