Add flatEntries utility

lib/www/server/lib/utils/flatEntries.js

@@ -0,0 +1,28 @@
+
+/** Converts an object into a list of [ key, value ]
+ * pairs, like Object.entries(), except that it recurses
+ * into the object.
+ *
+ * Nested keys are joined with `sep` (a `.` by default).
+ */
+function* flatEntries (obj, sep=".", parents=[]) {
+	if (typeof obj == "object" && obj !== null) {
+		for (let key in obj) {
+			const val = obj[key];
+			yield* flatEntries(val, sep, [...parents, key]);
+		}
+	} else {
+		yield [[...parents].join(sep), obj];
+	}
+}
+
+/** Run the flatEntries() generator
+ */
+function entries (obj, sep) {
+	return [...flatEntries(obj, sep)];
+}
+
+module.exports = {
+	flatEntries,
+	entries
+};