message: Remove eslint complaint in PlaceablesLayer
diff: @@ -27,7 +27,7 @@ declare class PlaceablesLayer
  /**
  * Keep track of history so that CTRL+Z can undo changes
  */
  - history: PlaceablesLayer.HistoryEvent<P>[]
  + history: Array<PlaceablesLayer.HistoryEvent<P>>
  /**
  * Placeable Layer Objects
  