data-structure-typed/src/types/helpers.ts

export type Comparator<T> = (a: T, b: T) => number;

export type DFSOrderPattern = 'pre' | 'in' | 'post';

export type BTNCallback<N, D = any> = (node: N) => D;

export enum CP {
  lt = 'lt',
  eq = 'eq',
  gt = 'gt'
}