Function getVal

dash/dash-renderer/src/persistence.js:294–296

    const element = Registry.resolve(layout);
    const getVal = prop =>
        props[prop] ||
        (element.defaultProps || element.dashPersistence || {})[prop];
    const persisted_props = getVal('persisted_props');
    const persistence_type = getVal('persistence_type');
    const canPersist = id && persisted_props && persistence_type;