feat: enhance configuration and options handling with merge functions

lib/core/config-defaults.ts

@@ -2,7 +2,9 @@ import { parseQuery, stringifyQuery } from '@/core/serializer/query-serializer'
 import { deepClone } from '@/shared/helpers/deep-clone'
 import { parseUrl } from './serializer/url-serializer'
 
-export function normalizeConfig(config?: FluentUrlConfig): FluentUrlConfig {
+export function normalizeConfig(
+  config?: Partial<FluentUrlConfig>,
+): FluentUrlConfig {
   return {
     parseQuery: config?.parseQuery ?? parseQuery,
     stringifyQuery: config?.stringifyQuery ?? stringifyQuery,
@@ -31,3 +33,27 @@ export function normalizeOptions(args: {
     queries: deepClone(urlOrOptions?.queries) ?? Object.create(null),
   }
 }
+
+export function mergeConfig(
+  current: FluentUrlConfig,
+  merge?: Partial<FluentUrlConfig>,
+): FluentUrlConfig {
+  return {
+    parseQuery: merge?.parseQuery ?? current.parseQuery,
+    stringifyQuery: merge?.stringifyQuery ?? current.stringifyQuery,
+  }
+}
+
+export function mergeOptions(
+  current: FLuentUrlPlainObject,
+  merge?: Partial<FLuentUrlPlainObject>,
+): FLuentUrlPlainObject {
+  return {
+    protocol: merge?.protocol ?? current.protocol,
+    hostname: merge?.hostname ?? current.hostname,
+    paths: merge?.paths ?? current.paths,
+    port: merge?.port ?? current.port,
+    fragment: merge?.fragment ?? current.fragment,
+    queries: merge?.queries ?? current.queries,
+  }
+}