Converted turf-transform-rotate to Typescript

packages/turf-transform-rotate/README.md

@@ -18,12 +18,12 @@ Rotates any geojson Feature or Geometry of a specified angle, around its `centro
 ### Examples
 
 ```javascript
-var poly = turf.polygon([[[0,29],[3.5,29],[2.5,32],[0,29]]]);
-var options = {pivot: [0, 25]};
-var rotatedPoly = turf.transformRotate(poly, 10, options);
+const poly = turf.polygon([[[0,29],[3.5,29],[2.5,32],[0,29]]]);
+const options = {pivot: [0, 25]};
+const rotatedPoly = turf.transformRotate(poly, 10, options);
 
 //addToMap
-var addToMap = [poly, rotatedPoly];
+const addToMap = [poly, rotatedPoly];
 rotatedPoly.properties = {stroke: '#F00', 'stroke-width': 4};
 ```
 

packages/turf-transform-rotate/bench.ts

@@ -1,8 +1,9 @@
+import { Feature } from "geojson";
 import fs from "fs";
 import path from "path";
 import { fileURLToPath } from "url";
 import { loadJsonFileSync } from "load-json-file";
-import Benchmark from "benchmark";
+import Benchmark, { Event } from "benchmark";
 import { transformRotate as rotate } from "./index.js";
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
@@ -11,7 +12,7 @@ const directory = path.join(__dirname, "test", "in") + path.sep;
 const fixtures = fs.readdirSync(directory).map((filename) => {
   return {
     name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directory + filename),
+    geojson: loadJsonFileSync(directory + filename) as Feature,
   };
 });
 
@@ -54,4 +55,4 @@ for (const { name, geojson } of fixtures) {
   suite.add(name, () => rotate(geojson, angle, { pivot, mutate: true }));
 }
 
-suite.on("cycle", (e) => console.log(String(e.target))).run();
+suite.on("cycle", (e: Event) => console.log(String(e.target))).run();

packages/turf-transform-rotate/index.js → packages/turf-transform-rotate/index.ts

@@ -1,11 +1,12 @@
+import { GeoJSON, GeometryCollection } from "geojson";
 import { centroid } from "@turf/centroid";
 import { rhumbBearing } from "@turf/rhumb-bearing";
 import { rhumbDistance } from "@turf/rhumb-distance";
 import { rhumbDestination } from "@turf/rhumb-destination";
 import { clone } from "@turf/clone";
 import { coordEach } from "@turf/meta";
 import { getCoords } from "@turf/invariant";
-import { isObject } from "@turf/helpers";
+import { isObject, Coord } from "@turf/helpers";
 
 /**
  * Rotates any geojson Feature or Geometry of a specified angle, around its `centroid` or a given `pivot` point.
@@ -18,20 +19,27 @@ import { isObject } from "@turf/helpers";
  * @param {boolean} [options.mutate=false] allows GeoJSON input to be mutated (significant performance increase if true)
  * @returns {GeoJSON} the rotated GeoJSON feature
  * @example
- * var poly = turf.polygon([[[0,29],[3.5,29],[2.5,32],[0,29]]]);
- * var options = {pivot: [0, 25]};
- * var rotatedPoly = turf.transformRotate(poly, 10, options);
+ * const poly = turf.polygon([[[0,29],[3.5,29],[2.5,32],[0,29]]]);
+ * const options = {pivot: [0, 25]};
+ * const rotatedPoly = turf.transformRotate(poly, 10, options);
  *
  * //addToMap
- * var addToMap = [poly, rotatedPoly];
+ * const addToMap = [poly, rotatedPoly];
  * rotatedPoly.properties = {stroke: '#F00', 'stroke-width': 4};
  */
-function transformRotate(geojson, angle, options) {
+function transformRotate<T extends GeoJSON | GeometryCollection>(
+  geojson: T,
+  angle: number,
+  options?: {
+    pivot?: Coord;
+    mutate?: boolean;
+  }
+): T {
   // Optional parameters
   options = options || {};
   if (!isObject(options)) throw new Error("options is invalid");
-  var pivot = options.pivot;
-  var mutate = options.mutate;
+  const pivot = options.pivot;
+  const mutate = options.mutate;
 
   // Input validation
   if (!geojson) throw new Error("geojson is required");
@@ -42,17 +50,19 @@ function transformRotate(geojson, angle, options) {
   if (angle === 0) return geojson;
 
   // Use centroid of GeoJSON if pivot is not provided
-  if (!pivot) pivot = centroid(geojson);
+  const pivotCoord = pivot ?? centroid(geojson);
 
   // Clone geojson to avoid side effects
   if (mutate === false || mutate === undefined) geojson = clone(geojson);
 
   // Rotate each coordinate
   coordEach(geojson, function (pointCoords) {
-    var initialAngle = rhumbBearing(pivot, pointCoords);
-    var finalAngle = initialAngle + angle;
-    var distance = rhumbDistance(pivot, pointCoords);
-    var newCoords = getCoords(rhumbDestination(pivot, distance, finalAngle));
+    const initialAngle = rhumbBearing(pivotCoord, pointCoords);
+    const finalAngle = initialAngle + angle;
+    const distance = rhumbDistance(pivotCoord, pointCoords);
+    const newCoords = getCoords(
+      rhumbDestination(pivotCoord, distance, finalAngle)
+    );
     pointCoords[0] = newCoords[0];
     pointCoords[1] = newCoords[1];
   });

packages/turf-transform-rotate/package.json

@@ -65,6 +65,7 @@
     "tape": "^5.7.2",
     "tsup": "^8.0.1",
     "tsx": "^4.6.2",
+    "typescript": "^5.2.2",
     "write-json-file": "^5.0.0"
   },
   "dependencies": {
@@ -75,6 +76,8 @@
     "@turf/meta": "workspace:^",
     "@turf/rhumb-bearing": "workspace:^",
     "@turf/rhumb-destination": "workspace:^",
-    "@turf/rhumb-distance": "workspace:^"
+    "@turf/rhumb-distance": "workspace:^",
+    "@types/geojson": "7946.0.8",
+    "tslib": "^2.6.2"
   }
 }

packages/turf-transform-rotate/test.ts

@@ -1,3 +1,4 @@
+import { Feature, GeoJSON, GeometryCollection } from "geojson";
 import fs from "fs";
 import test from "tape";
 import path from "path";
@@ -12,6 +13,7 @@ import {
   lineString,
   featureCollection,
   geometryCollection,
+  Coord,
 } from "@turf/helpers";
 import { transformRotate as rotate } from "./index.js";
 
@@ -26,7 +28,7 @@ const fixtures = fs.readdirSync(directories.in).map((filename) => {
   return {
     filename,
     name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directories.in + filename),
+    geojson: loadJsonFileSync(directories.in + filename) as Feature,
   };
 });
 
@@ -55,9 +57,12 @@ test("rotate -- throws", (t) => {
     [12, 15],
   ]);
 
+  // @ts-expect-error testing JS runtime for mis-typed option
   t.throws(() => rotate(null, 100), /geojson is required/, "missing geojson");
+  // @ts-expect-error testing JS runtime for mis-typed option
   t.throws(() => rotate(line, null), /angle is required/, "missing angle");
   t.throws(
+    // @ts-expect-error testing JS runtime for mis-typed option
     () => rotate(line, 56, { pivot: "notApoint" }),
     /coord must be GeoJSON Point or an Array of numbers/,
     "coord must be GeoJSON Point or an Array of numbers"
@@ -116,7 +121,10 @@ test("rotate -- geometry support", (t) => {
 });
 
 // style result
-function colorize(geojson) {
+function colorize(geojson: Feature) {
+  // We are going to add some properties, so make sure properties attribute is
+  // present.
+  geojson.properties = geojson.properties ?? {};
   if (
     geojson.geometry.type === "Point" ||
     geojson.geometry.type === "MultiPoint"
@@ -130,9 +138,10 @@ function colorize(geojson) {
   return geojson;
 }
 
-function makePivot(pivot, geojson) {
+function makePivot(pivot: Coord, geojson: GeoJSON | GeometryCollection) {
   if (!pivot) {
     const pt = centroid(geojson);
+    pt.properties = pt.properties ?? {};
     pt.properties["marker-symbol"] = "circle";
     return pt;
   }