text: export const CALCULATOR_STATE_RESET = 'calculator/state/reset'
  export const CALCULATOR_INPUT_UPDATE = 'calculator/input/update'
  export const CALCULATOR_RESULT_UPDATE = 'calculator/expression/update'
  export const CALCULATOR_BUTTON_CLICK = 'calculator/button/click'
  
  // input update
  export const updateExpression = (value) => ({ type: CALCULATOR_INPUT_UPDATE, value })
  
  // button click
  export const buttonClick = (value) => ({ type: CALCULATOR_BUTTON_CLICK, value })
  
  // reset state
  export const resetState = () => ({ type: CALCULATOR_STATE_RESET })
  