An optional event cache. This will be consumed by event cache API to store some expensive calculation result. So that for the same event across plugins, the result doesn't need to be calculated again
Type of this event
A callback array to let editor retrieve context menu item related to this event. Plugins can add their own getter callback to this array, items from each getter will be separated by a splitter item represented by null
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This interface represents a PluginEvent wrapping native ContextMenu event