In an embodiment, a computer system instantiates a real-time incremental editor configured to receive editing inputs that are to be applied to data of a data model, where the data model data declaratively defines a UI model that drives the behavior of a corresponding UI based on the UI model. The computer system receives an editing input from a user indicating one or more desired edits that are to be made to the UI and determines, based on the received editing inputs, which changes are to be made to the data model data to enact the desired changes in the UI. The computer system updates the UI in real-time based on the determined edits to the data model data and presents the updated UI in real-time without losing state information in the resultant UI.