fix issue in deep merging of config files to handle empty source keys

Author: realtux

lib/core/helper.js

@@ -3,11 +3,13 @@ export default new class {
     deep_merge(target, source) {
         if (typeof target === 'object' && target !== null &&
             typeof source === 'object' && source !== null) {
+
             for (const key of Object.keys(source)) {
                 if (typeof source[key] === 'object' && source[key] !== null) {
-                    if (!target[key] || typeof target[key] !== 'object') {
+                    if (!target.hasOwnProperty(key)) {
                         target[key] = Array.isArray(source[key]) ? [] : {};
                     }
+
                     this.deep_merge(target[key], source[key]);
                 } else {
                     target[key] = source[key];

package.json

@@ -2,7 +2,7 @@
     "name": "@exajs/core",
     "type": "module",
     "author": "Brian Seymour <@realtux>",
-    "version": "0.0.24",
+    "version": "0.0.25",
     "description": "modern opinionated node.js framework",
     "license": "MIT",
     "homepage": "https://github.com/realtux/exa",