Misc types fixes

src/core/string.js

@@ -221,19 +221,19 @@ const string = {
      *
      * @param {...number} args - The code points to convert to a string.
      * @returns {string} The converted string.
+     * @ignore
      */
-    fromCodePoint(/* ...args */) {
-        const chars = [];
-        let current;
-        let codePoint;
-        let units;
-        for (let i = 0; i < arguments.length; ++i) {
-            current = Number(arguments[i]);
-            codePoint = current - 0x10000;
-            units = current > 0xFFFF ? [(codePoint >> 10) + 0xD800, (codePoint % 0x400) + 0xDC00] : [current];
-            chars.push(String.fromCharCode.apply(null, units));
-        }
-        return chars.join('');
+    fromCodePoint(...args) {
+        return args.map((codePoint) => {
+            if (codePoint > 0xFFFF) {
+                codePoint -= 0x10000;
+                return String.fromCharCode(
+                    (codePoint >> 10) + 0xD800,
+                    (codePoint % 0x400) + 0xDC00
+                );
+            }
+            return String.fromCharCode(codePoint);
+        }).join('');
     }
 };
 

src/framework/components/scroll-view/component.js

@@ -601,8 +601,6 @@ class ScrollViewComponent extends Component {
 
     /**
      * @param {string} onOrOff - 'on' or 'off'.
-     * @param {ScrollViewComponentSystem} system - The ComponentSystem that
-     * created this Component.
      * @private
      */
     _toggleLifecycleListeners(onOrOff) {

test/core/string.test.mjs

@@ -42,4 +42,36 @@ describe('string', function () {
 
     });
 
+    describe('#fromCodePoint', function () {
+        it('converts basic ASCII code points to characters', function () {
+            expect(string.fromCodePoint(65)).to.equal('A');
+            expect(string.fromCodePoint(66, 67)).to.equal('BC');
+            expect(string.fromCodePoint(97, 98, 99)).to.equal('abc');
+        });
+
+        it('handles code points beyond the BMP (Basic Multilingual Plane)', function () {
+            // Emoji: 😀 (U+1F600 GRINNING FACE)
+            expect(string.fromCodePoint(0x1F600)).to.equal('😀');
+
+            // Musical note: 𝄞 (U+1D11E MUSICAL SYMBOL G CLEF)
+            expect(string.fromCodePoint(0x1D11E)).to.equal('𝄞');
+        });
+
+        it('handles multiple code points including surrogate pairs', function () {
+            // Mix of BMP and astral code points
+            expect(string.fromCodePoint(65, 0x1F600, 66)).to.equal('A😀B');
+
+            // Multiple astral code points: 💩 (U+1F4A9) and 🚀 (U+1F680)
+            expect(string.fromCodePoint(0x1F4A9, 0x1F680)).to.equal('💩🚀');
+        });
+
+        it('matches native String.fromCodePoint behavior', function () {
+            // Only run if native method is available
+            if (String.fromCodePoint) {
+                const testPoints = [65, 0x1F600, 0x1D11E, 0x10437];
+                expect(string.fromCodePoint(...testPoints)).to.equal(String.fromCodePoint(...testPoints));
+            }
+        });
+    });
+
 });