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-rw-r--r--js/lib/mergedeep.js32
1 files changed, 32 insertions, 0 deletions
diff --git a/js/lib/mergedeep.js b/js/lib/mergedeep.js
new file mode 100644
index 0000000..dfd0dd2
--- /dev/null
+++ b/js/lib/mergedeep.js
@@ -0,0 +1,32 @@
+// https://stackoverflow.com/questions/27936772/how-to-deep-merge-instead-of-shallow-merge
+/**
+ * Simple object check.
+ * @param item
+ * @returns {boolean}
+ */
+function isObject(item) {
+ return (item && typeof item === 'object' && !Array.isArray(item));
+}
+
+/**
+ * Deep merge two objects.
+ * @param target
+ * @param ...sources
+ */
+function mergeDeep(target, ...sources) {
+ if (!sources.length) return target;
+ const source = sources.shift();
+
+ if (isObject(target) && isObject(source)) {
+ for (const key in source) {
+ if (isObject(source[key])) {
+ if (!target[key]) Object.assign(target, { [key]: {} });
+ mergeDeep(target[key], source[key]);
+ } else {
+ Object.assign(target, { [key]: source[key] });
+ }
+ }
+ }
+
+ return mergeDeep(target, ...sources);
+}