docs: generate docs

Author: l1bbcsg

README.md

@@ -4898,6 +4898,17 @@ function quux () {
 function quux () {
 }
 
+/**
+ * @interface
+ */
+class Foo {
+  /**
+   * @returns {string}
+   */
+  bar () {
+  }
+}
+
 /**
  * @returns {undefined} Foo.
  */