Function modProp

dash/dash-renderer/src/persistence.js:374–393

(key, storage, element, props, persistedProp, update, undo)

const UNDO = true;
function modProp(key, storage, element, props, persistedProp, update, undo) {
    if (storage.hasItem(key)) {
        const [newVal, originalVal] = storage.getItem(key);
        const fromVal = undo ? newVal : originalVal;
        const toVal = undo ? originalVal : newVal;
        const [propName, propPart] = persistedProp.split('.');
        const transform = getTransform(element, propName, propPart);

        if (equals(fromVal, transform.extract(props[propName]))) {
            update[propName] = transform.apply(
                toVal,
                propName in update ? update[propName] : props[propName]
            );
        } else {
            // clear this saved edit - we've started with the wrong
            // value for this persistence ID
            storage.removeItem(key);
        }
    }
}

function persistenceMods(layout, component, path, dispatch) {
    const {