diff --git a/packages/modeling/src/index.test-d.ts b/packages/modeling/src/index.test-d.ts
index 56fa87b60..85ea14da6 100644
--- a/packages/modeling/src/index.test-d.ts
+++ b/packages/modeling/src/index.test-d.ts
@@ -1,9 +1,12 @@
-import { expectType, expectNotType, expectError } from 'tsd'
+import { expectType, expectNotType, expectError, expectAssignable } from 'tsd'
 
 import { geometries } from './'
+import { snap, generalize } from './operations/modifiers'
 
 const { geom2 } = geometries
 
+expectAssignable<Function>(snap)
+expectAssignable<Function>(generalize)
 expectType(geom2.create())
 expectType<geom2.Geom2>(geom2.create([]))
 expectType<geom2.Geom2>(
diff --git a/packages/modeling/src/operations/modifiers/generalize.d.ts b/packages/modeling/src/operations/modifiers/generalize.d.ts
index 5ab0a4432..70e92e535 100644
--- a/packages/modeling/src/operations/modifiers/generalize.d.ts
+++ b/packages/modeling/src/operations/modifiers/generalize.d.ts
@@ -7,6 +7,6 @@ export interface GeneralizeOptions {
   triangulate?: boolean
 }
 
-export function generalize<T extends Geometry>(options: GeneralizeOptions, geometry: T): T
-export function generalize<T extends Geometry>(options: GeneralizeOptions, ...geometries: RecursiveArray<T>): Array<T>
-export function generalize(options: GeneralizeOptions, ...geometries: RecursiveArray<Geometry>): Array<Geometry>
+export default function generalize<T extends Geometry>(options: GeneralizeOptions, geometry: T): T
+export default function generalize<T extends Geometry>(options: GeneralizeOptions, ...geometries: RecursiveArray<T>): Array<T>
+export default function generalize(options: GeneralizeOptions, ...geometries: RecursiveArray<Geometry>): Array<Geometry>
diff --git a/packages/modeling/src/operations/modifiers/snap.d.ts b/packages/modeling/src/operations/modifiers/snap.d.ts
index 98c01c401..01010f0f8 100644
--- a/packages/modeling/src/operations/modifiers/snap.d.ts
+++ b/packages/modeling/src/operations/modifiers/snap.d.ts
@@ -1,6 +1,6 @@
 import { Geometry } from '../../geometries/types'
 import RecursiveArray from '../../utils/recursiveArray'
 
-export function snap<T extends Geometry>(geometry: T): T
-export function snap<T extends Geometry>(...geometries: RecursiveArray<T>): Array<T>
-export function snap(...geometries: RecursiveArray<Geometry>): Array<Geometry>
+export default function snap<T extends Geometry>(geometry: T): T
+export default function snap<T extends Geometry>(...geometries: RecursiveArray<T>): Array<T>
+export default function snap(...geometries: RecursiveArray<Geometry>): Array<Geometry>