How about splitting them up by the folder the class was from? i.e. “sprite_nodes”, “label_nodes”, etc.
In all honestly, for auto generated code like that, having them arbitrarily split up between “jsb_cocos2dx_bindings_1” to “jsb_cocos2dx_bindings_12” would be preferable to the current state. In any moden IDE it’s easy enough to search across multiple files.