diff --git a/types/microstates.d.ts b/types/microstates.d.ts
index 0e63030c..45296f3c 100644
--- a/types/microstates.d.ts
+++ b/types/microstates.d.ts
@@ -56,6 +56,10 @@ declare module "microstates" {
     slice(start?: number, end?: number): ArrayType<T>
     sort(fn: (a: any, b: any) => number): ArrayType<T>
     filter(fn: (member: T) => boolean): ArrayType<T>
+    map(fn: (member: T) => T): ArrayType<T>
+    remove(item: any): ArrayType<T>
+    clear(): ArrayType<T>
+    initialize(value: any): ArrayType<T>
   }
 
   interface ArrayTypeConstructor {
diff --git a/types/types.test.ts b/types/types.test.ts
index fdb93441..d684370d 100644
--- a/types/types.test.ts
+++ b/types/types.test.ts
@@ -117,4 +117,24 @@ describe('ArrayType', () => {
       a.filter((item) => (item.state + '!!!') === 'hello!!!')
     )
   });
+  it('has map transition that returns ArrayType', () => {
+    expectType<ArrayType<StringType>>(
+      a.map(item => item.concat('!!!'))
+    )
+  });
+  it('has remove transition that returns ArrayType', () => {
+    expectType<ArrayType<StringType>>(
+      a.remove('hello')
+    )
+  });
+  it('has clear transition that returns ArrayType', () => {
+    expectType<ArrayType<StringType>>(
+      a.clear()
+    )
+  });
+  it('has initialize transition taht returns ArrayType', () => {
+    expectType<ArrayType<StringType>>(
+      a.initialize('foo')
+    )
+  });
 });