.

qwen/nodejs/node_modules/nodemon/lib/utils/merge.js

@@ -0,0 +1,47 @@
+var clone = require('./clone');
+
+module.exports = merge;
+
+function typesMatch(a, b) {
+  return (typeof a === typeof b) && (Array.isArray(a) === Array.isArray(b));
+}
+
+/**
+ * A deep merge of the source based on the target.
+ * @param  {Object} source   [description]
+ * @param  {Object} target   [description]
+ * @return {Object}          [description]
+ */
+function merge(source, target, result) {
+  if (result === undefined) {
+    result = clone(source);
+  }
+
+  // merge missing values from the target to the source
+  Object.getOwnPropertyNames(target).forEach(function (key) {
+    if (source[key] === undefined) {
+      result[key] = target[key];
+    }
+  });
+
+  Object.getOwnPropertyNames(source).forEach(function (key) {
+    var value = source[key];
+
+    if (target[key] && typesMatch(value, target[key])) {
+      // merge empty values
+      if (value === '') {
+        result[key] = target[key];
+      }
+
+      if (Array.isArray(value)) {
+        if (value.length === 0 && target[key].length) {
+          result[key] = target[key].slice(0);
+        }
+      } else if (typeof value === 'object') {
+        result[key] = merge(value, target[key]);
+      }
+    }
+  });
+
+  return result;
+}