export const UNVISITED_STACK = 'UNVISITED_STACK' ; export const SWAP_STACK = 'SWAP_STACK' ; export const CURRENT_STACK = 'CURRENT_STACK' ; export const PUT_IN_PLACE = 'PUT_IN_PLACE' ; export const MERGING_STACK = 'MERGING_STACK' ; export const LEFT_TO_MERGE_STACK = 'LEFT_TO_MERGE_STACK' ; export type SortingStackType = typeof UNVISITED_STACK | typeof SWAP_STACK | typeof CURRENT_STACK | typeof PUT_IN_PLACE | typeof MERGING_STACK | typeof LEFT_TO_MERGE_STACK ;