Update traverse to recognize Symbol properties

index.js

@@ -24,11 +24,25 @@ function forEach(xs, fn) {
 }
 
 // TODO: use object-keys
-var objectKeys = Object.keys || function keys(obj) {
+function objectKeys(obj) {
 	var res = [];
-	for (var key in obj) { res.push(key); } // eslint-disable-line no-restricted-syntax
+
+	for (var key in obj) { // eslint-disable-line no-restricted-syntax
+		res.push(key);
+	}
+
+	if (Object.getOwnPropertySymbols) {
+		var symbols = Object.getOwnPropertySymbols(obj);
+
+		for (var i = 0; i < symbols.length; i++) {
+			if (Object.prototype.propertyIsEnumerable.call(obj, symbols[i])) {
+				res.push(symbols[i]);
+			}
+		}
+	}
+
 	return res;
-};
+}
 
 // TODO: use object.hasown
 var hasOwnProperty = Object.prototype.hasOwnProperty || function (obj, key) {

test/has.js

@@ -13,5 +13,26 @@ test('has', function (t) {
 	t.equal(traverse(obj).has(['a']), true);
 	t.equal(traverse(obj).has(['a', 2]), false);
 
+	if (global.Symbol) {
+		var globalSymbol = Symbol.for('d'); // eslint-disable-line no-restricted-properties
+		var localSymbol = Symbol('e');
+		var nonEnumerableSymbol = Symbol('e');
+
+		obj[globalSymbol] = {};
+		obj[globalSymbol][localSymbol] = 7;
+		obj[localSymbol] = 8;
+		Object.defineProperty(obj, nonEnumerableSymbol, { value: 42, enumerable: false });
+
+		t.equal(traverse(obj).has([globalSymbol]), true);
+		t.equal(traverse(obj).has([globalSymbol, globalSymbol]), false);
+		t.equal(traverse(obj).has([globalSymbol, localSymbol]), true);
+		t.equal(traverse(obj).has([localSymbol]), true);
+		t.equal(traverse(obj).has([localSymbol]), true);
+		t.equal(traverse(obj).has([nonEnumerableSymbol]), true);
+		t.equal(traverse(obj).has([Symbol('e')]), false);
+		t.equal(traverse(obj).has([Symbol.for('d')]), true); // eslint-disable-line no-restricted-properties
+		t.equal(traverse(obj).has([Symbol.for('e')]), false); // eslint-disable-line no-restricted-properties
+	}
+
 	t.end();
 });