From 248f3a82113964c11d8eda182a8e1256c90a5600 Mon Sep 17 00:00:00 2001
From: Matthew Fedderly <24275386+mfedderly@users.noreply.github.com>
Date: Mon, 15 Dec 2025 18:31:51 -0500
Subject: [PATCH 1/2] Improve type inference in @turf/helpers' geometry and
 geometryCollection functions

---
 packages/turf-helpers/index.ts | 42 ++++++++++++++++++++++------------
 1 file changed, 28 insertions(+), 14 deletions(-)

diff --git a/packages/turf-helpers/index.ts b/packages/turf-helpers/index.ts
index b4fc01ee57..426b18f57a 100644
--- a/packages/turf-helpers/index.ts
+++ b/packages/turf-helpers/index.ts
@@ -207,30 +207,39 @@ export function feature<
  * var geometry = turf.geometry(type, coordinates);
  * // => geometry
  */
-export function geometry(
-  type:
+export function geometry<
+  T extends
     | "Point"
     | "LineString"
     | "Polygon"
     | "MultiPoint"
     | "MultiLineString"
     | "MultiPolygon",
+>(
+  type: T,
   coordinates: any[],
   _options: Record<string, never> = {}
-) {
+): {
+  Point: Point;
+  LineString: LineString;
+  Polygon: Polygon;
+  MultiPoint: MultiPoint;
+  MultiLineString: MultiLineString;
+  MultiPolygon: MultiPolygon;
+}[T] {
   switch (type) {
     case "Point":
-      return point(coordinates).geometry;
+      return point(coordinates).geometry as any;
     case "LineString":
-      return lineString(coordinates).geometry;
+      return lineString(coordinates).geometry satisfies LineString as any;
     case "Polygon":
-      return polygon(coordinates).geometry;
+      return polygon(coordinates).geometry as any;
     case "MultiPoint":
-      return multiPoint(coordinates).geometry;
+      return multiPoint(coordinates).geometry as any;
     case "MultiLineString":
-      return multiLineString(coordinates).geometry;
+      return multiLineString(coordinates).geometry as any;
     case "MultiPolygon":
-      return multiPolygon(coordinates).geometry;
+      return multiPolygon(coordinates).geometry as any;
     default:
       throw new Error(type + " is invalid");
   }
@@ -598,15 +607,20 @@ export function multiPolygon<P extends GeoJsonProperties = GeoJsonProperties>(
  * // => collection
  */
 export function geometryCollection<
+  G extends
+    | Point
+    | LineString
+    | Polygon
+    | MultiPoint
+    | MultiLineString
+    | MultiPolygon,
   P extends GeoJsonProperties = GeoJsonProperties,
 >(
-  geometries: Array<
-    Point | LineString | Polygon | MultiPoint | MultiLineString | MultiPolygon
-  >,
+  geometries: Array<G>,
   properties?: P,
   options: { bbox?: BBox; id?: Id } = {}
-): Feature<GeometryCollection, P> {
-  const geom: GeometryCollection = {
+): Feature<GeometryCollection<G>, P> {
+  const geom: GeometryCollection<G> = {
     type: "GeometryCollection",
     geometries,
   };

From 511d9436cd858ac12e7a003a119b8a98e603a59b Mon Sep 17 00:00:00 2001
From: Matthew Fedderly <24275386+mfedderly@users.noreply.github.com>
Date: Tue, 16 Dec 2025 07:55:47 -0500
Subject: [PATCH 2/2] Remove wayward satisfies use

---
 packages/turf-helpers/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/turf-helpers/index.ts b/packages/turf-helpers/index.ts
index 426b18f57a..c6c3547549 100644
--- a/packages/turf-helpers/index.ts
+++ b/packages/turf-helpers/index.ts
@@ -231,7 +231,7 @@ export function geometry<
     case "Point":
       return point(coordinates).geometry as any;
     case "LineString":
-      return lineString(coordinates).geometry satisfies LineString as any;
+      return lineString(coordinates).geometry as any;
     case "Polygon":
       return polygon(coordinates).geometry as any;
     case "MultiPoint":