diff --git a/src/ast/nodes/shared/ArrayPrototype.ts b/src/ast/nodes/shared/ArrayPrototype.ts
index a1a1d3d6912..e5ef5d37515 100644
--- a/src/ast/nodes/shared/ArrayPrototype.ts
+++ b/src/ast/nodes/shared/ArrayPrototype.ts
@@ -133,6 +133,8 @@ export const ARRAY_PROTOTYPE = new ObjectEntity(
 		flat: METHOD_DEOPTS_SELF_RETURNS_NEW_ARRAY,
 		flatMap: METHOD_CALLS_ARG_DEOPTS_SELF_RETURNS_NEW_ARRAY,
 		forEach: METHOD_CALLS_ARG_DEOPTS_SELF_RETURNS_UNKNOWN,
+		groupBy: METHOD_CALLS_ARG_DEOPTS_SELF_RETURNS_UNKNOWN,
+		groupByToMap: METHOD_CALLS_ARG_DEOPTS_SELF_RETURNS_UNKNOWN,
 		includes: METHOD_RETURNS_BOOLEAN,
 		indexOf: METHOD_RETURNS_NUMBER,
 		join: METHOD_RETURNS_STRING,
diff --git a/test/form/samples/builtin-prototypes/array-expression/_expected.js b/test/form/samples/builtin-prototypes/array-expression/_expected.js
index 4fea44f0ad9..df9bd95554b 100644
--- a/test/form/samples/builtin-prototypes/array-expression/_expected.js
+++ b/test/form/samples/builtin-prototypes/array-expression/_expected.js
@@ -55,6 +55,14 @@ _flatMapArray[0].effect();
 const _forEachArray = [{ effect() {} }];
 _forEachArray.forEach(element => (element.effect = () => console.log(1)));
 _forEachArray[0].effect();
+[1].groupBy(() => console.log(1) || true);
+const _groupByArray = [{ effect() {} }];
+_groupByArray.groupBy((_, element) => (element.effect = () => console.log(1)));
+_groupByArray[0].effect();
+[1].groupByToMap(() => console.log(1) || true);
+const _groupByToMapArray = [{ effect() {} }];
+_groupByToMapArray.groupBy((_, element) => (element.effect = () => console.log(1)));
+_groupByToMapArray[0].effect();
 [1].map(() => console.log(1) || 1);
 const _mapArray = [{ effect() {} }];
 _mapArray.map(element => (element.effect = () => console.log(1)));
diff --git a/test/form/samples/builtin-prototypes/array-expression/main.js b/test/form/samples/builtin-prototypes/array-expression/main.js
index 3cf1b47ca43..3cbf65355ac 100644
--- a/test/form/samples/builtin-prototypes/array-expression/main.js
+++ b/test/form/samples/builtin-prototypes/array-expression/main.js
@@ -104,6 +104,18 @@ const _forEachArray = [{ effect() {} }];
 _forEachArray.forEach(element => (element.effect = () => console.log(1)));
 _forEachArray[0].effect();
 
+const _groupBy = [1].groupBy(() => true);
+const _groupByEffect = [1].groupBy(() => console.log(1) || true);
+const _groupByArray = [{ effect() {} }];
+_groupByArray.groupBy((_, element) => (element.effect = () => console.log(1)));
+_groupByArray[0].effect();
+
+const _groupByToMap = [1].groupByToMap(() => true);
+const _groupByToMapEffect = [1].groupByToMap(() => console.log(1) || true);
+const _groupByToMapArray = [{ effect() {} }];
+_groupByToMapArray.groupBy((_, element) => (element.effect = () => console.log(1)));
+_groupByToMapArray[0].effect();
+
 const _map = [1].map(() => 1).join(',');
 const _mapEffect = [1].map(() => console.log(1) || 1);
 const _mapArray = [{ effect() {} }];