feat(utils): deep merge for objects

src/utils/deepMerge.ts

@@ -0,0 +1,17 @@
+import { is } from './getType';
+
+type Entity = Record<string, unknown>
+
+export function deepMerge(target: Entity, source: Entity) {
+  Object.keys(source).forEach(key => {
+    if (!Object.prototype.hasOwnProperty.call(target, key) || !is.Object(source[key])) {
+      const areBothArrays = [target[key], source[key]].every(Array.isArray);
+
+      target[key] = areBothArrays ? (target[key] as unknown[]).concat(source[key]) : source[key];
+    } else {
+      deepMerge(target[key] as Entity, source[key] as Entity);
+    }
+  });
+
+  return target;
+}