text: // @flow
  export type WellMouseEvent = {|
    wellName: string,
    event: SyntheticMouseEvent<Element>,
  |}
  
  // wellName to CSS color, eg {'A1': '#123456'}
  export type WellFill = { [wellName: string]: string, ... }
  
  // Use this like a Set!
  export type WellGroup = { [wellName: string]: null, ... }
  