Theming API: Add new helper methods and remove useColorScheme

components/lib/themes/utils/extendPreset.js

@@ -0,0 +1,15 @@
+import Theme from 'primevue/themes';
+
+export default (preset1, preset2) => {
+    const [{ primitive: p1, semantic: s1, components: c1, directives: d1 }, { primitive: p2, semantic: s2, components: c2, directives: d2 }] = [preset1, preset2];
+    const newPreset = {
+        primitive: { ...p1, ...p2 },
+        semantic: { ...s1, ...s2 },
+        components: { ...c1, ...c2 },
+        directives: { ...d1, ...d2 }
+    };
+
+    Theme.setPreset(newPreset);
+
+    return newPreset;
+};