Add TypeScript declaration to @turf/clean-coords (Turfjs#1608)

packages/turf-clean-coords/index.d.ts

@@ -0,0 +1,26 @@
+import { Geometry, Feature } from "@turf/helpers";
+
+/**
+ * Removes redundant coordinates from any GeoJSON Geometry.
+ *
+ * @name cleanCoords
+ * @param {Geometry|Feature} geojson Feature or Geometry
+ * @param {Object} [options={}] Optional parameters
+ * @param {boolean} [options.mutate=false] allows GeoJSON input to be mutated
+ * @returns {Geometry|Feature} the cleaned input Feature/Geometry
+ * @example
+ * var line = turf.lineString([[0, 0], [0, 2], [0, 5], [0, 8], [0, 8], [0, 10]]);
+ * var multiPoint = turf.multiPoint([[0, 0], [0, 0], [2, 2]]);
+ *
+ * turf.cleanCoords(line).geometry.coordinates;
+ * //= [[0, 0], [0, 10]]
+ *
+ * turf.cleanCoords(multiPoint).geometry.coordinates;
+ * //= [[0, 0], [2, 2]]
+ */
+export default function cleanCoords<T extends Geometry | Feature>(
+    geojson: T,
+    options?: {
+        mutate?: boolean
+    }
+): T;