ktsn

type FnMapperR<T> = {
  [K in keyof T]: (...args: any[]) => T[K]
}

type FnMapper2<T, U, R> = {
  [K in keyof U]: (t: T, u: U[K]) => R
}

declare function module <S, G, A, M> (module: {
  namespaced?: boolean,

ktsn

export const ({ shouldRecord, invertAction, isUndo, isRedo }) => {
  const history = []
  
  return store => next => action => {
    if (isUndo(action)) {
      const invert = invertAction(lastUndoable(history))
      history.push(invert)
      next(invert)
      return
    }

ktsn

el.addEventListener('mousemove', event => {
  const rect = event.currentTarget.getBoundingClientRect()
  const pos = {
    left: event.clientX - rect.left,
    top: event.clientY - rect.top
  }
})

ktsn

export function traverse<T, U>(obj: Dictionary<T>, f: (t: T) => Array<U>) : Array<Dictionary<U>> {
  return sequence(
    mapValues(obj, t => {
      return f(t)
    })
  )
}

export function sequence<T>(obj: Dictionary<Array<T>>) : Array<Dictionary<T>> {
  function loop<T>(acc: Array<Dictionary<T>>, obj: Dictionary<Array<T>>) : Array<Dictionary<T>> {

ktsn

import {
  INIT_SOME_DATA,
  ADD_SOME_DATA,
  MOVE_SOME_DATA,
  REMOVE_SOME_DATA,
  UPDATE_SOME_DATA
} from '../mutation_types'

import { ISomeData } from '../model/some_data'

ktsn

// use shorter name in local
const ADD = `ADD_TOAST_MESSAGE`
const REMOVE = `REMOVE_TOAST_MESSAGE`

// export as longer name with suffix
export {
  ADD as ADD_TOAST_MESSAGE,
  REMOVE as REMOVE_TOAST_MESSAGE
}

ktsn

type Subscriber<T> = (val: T) => void
type Unsubscriber = () => void

export default class Observable<T> {
  private subscribers: Subscriber<T>[] = []
  private unsubscriber: Unsubscriber
  private _value: T

  constructor(source?: (cb: Subscriber<T>) => Unsubscriber) {
    if (source) {