--- /dev/null
+# Ignore node_modules folder created when installing core's JavaScript
+# dependencies.
+node_modules
+
+# Ignore overrides of core's phpcs.xml.dist and phpunit.xml.dist.
+phpcs.xml
+phpunit.xml
+
+# Ignore package-lock.json that is automatically created when adding
+# dependencies by users of NPMv5.
+package-lock.json