Move quadKey function to the one place it is used

src/ol/source/BingMaps.js

@@ -8,10 +8,35 @@ import {jsonp as requestJSONP} from '../net.js';
 import {get as getProjection, getTransformFromProjections} from '../proj.js';
 import SourceState from './State.js';
 import TileImage from './TileImage.js';
-import {createOrUpdate, quadKey} from '../tilecoord.js';
+import {createOrUpdate} from '../tilecoord.js';
 import {createXYZ, extentFromProjection} from '../tilegrid.js';
 
 
+/**
+ * @param {import('../tilecoord.js').TileCoord} tileCoord Tile coord.
+ * @return {string} Quad key.
+ */
+export function quadKey(tileCoord) {
+  const z = tileCoord[0];
+  const digits = new Array(z);
+  let mask = 1 << (z - 1);
+  let i, charCode;
+  for (i = 0; i < z; ++i) {
+    // 48 is charCode for 0 - '0'.charCodeAt(0)
+    charCode = 48;
+    if (tileCoord[1] & mask) {
+      charCode += 1;
+    }
+    if (tileCoord[2] & mask) {
+      charCode += 2;
+    }
+    digits[i] = String.fromCharCode(charCode);
+    mask >>= 1;
+  }
+  return digits.join('');
+}
+
+
 /**
  * The attribution containing a link to the Microsoft® Bing™ Maps Platform APIs’
  * Terms Of Use.
@@ -209,6 +234,7 @@ class BingMaps extends TileImage {
     const hidpi = this.hidpi_;
     this.tileUrlFunction = createFromTileUrlFunctions(
       resource.imageUrlSubdomains.map(function(subdomain) {
+        /** @type {import('../tilecoord.js').TileCoord} */
         const quadKeyTileCoord = [0, 0, 0];
         const imageUrl = resource.imageUrl
           .replace('{subdomain}', subdomain)

src/ol/tilecoord.js

@@ -70,31 +70,6 @@ export function hash(tileCoord) {
 }
 
 
-/**
- * @param {TileCoord} tileCoord Tile coord.
- * @return {string} Quad key.
- */
-export function quadKey(tileCoord) {
-  const z = tileCoord[0];
-  const digits = new Array(z);
-  let mask = 1 << (z - 1);
-  let i, charCode;
-  for (i = 0; i < z; ++i) {
-    // 48 is charCode for 0 - '0'.charCodeAt(0)
-    charCode = 48;
-    if (tileCoord[1] & mask) {
-      charCode += 1;
-    }
-    if (tileCoord[2] & mask) {
-      charCode += 2;
-    }
-    digits[i] = String.fromCharCode(charCode);
-    mask >>= 1;
-  }
-  return digits.join('');
-}
-
-
 /**
  * @param {TileCoord} tileCoord Tile coordinate.
  * @param {!import("./tilegrid/TileGrid.js").default} tileGrid Tile grid.

test/spec/ol/source/bingmaps.test.js

@@ -1,10 +1,17 @@
-import BingMaps from '../../../../src/ol/source/BingMaps.js';
+import BingMaps, {quadKey} from '../../../../src/ol/source/BingMaps.js';
-import {quadKey} from '../../../../src/ol/tilecoord.js';
 import {unByKey} from '../../../../src/ol/Observable.js';
 
 
 describe('ol.source.BingMaps', function() {
 
+  describe('quadKey()', function() {
+    it('returns expected string', function() {
+      const tileCoord = [3, 3, 5];
+      const s = quadKey(tileCoord);
+      expect(s).to.eql('213');
+    });
+  });
+
   describe('#tileUrlFunction()', function() {
 
     let source, tileGrid;

test/spec/ol/tilecoord.test.js

@@ -1,5 +1,4 @@
 import {
-  quadKey,
   getKey,
   fromKey,
   hash,
@@ -19,14 +18,6 @@ describe('ol.TileCoord', function() {
     });
   });
 
-  describe('call quadKey', function() {
-    it('returns expected string', function() {
-      const tileCoord = [3, 3, 5];
-      const s = quadKey(tileCoord);
-      expect(s).to.eql('213');
-    });
-  });
-
   describe('getKey()', function() {
     it('returns a key for a tile coord', function() {
       const key = getKey([1, 2, 3]);