@aller/blink/src/reducers/screen.ts

A library for tracking user behaviour.

import { SCREEN_SHOW, SCREEN_HIDE } from '../actions';

export interface ScreenEvent {
  time: Date;
  type: 'show' | 'hide';
}

export interface ScreenState {
  events: ScreenEvent[];
}

function events(state: ScreenEvent[] = [], action: any) {
  switch (action.type) {
    case SCREEN_SHOW:
      return state.concat({
        time: action.payload.time || new Date(),
        type: 'show',
      });
    case SCREEN_HIDE:
      return state.concat({
        time: action.payload.time || new Date(),
        type: 'hide',
      });
    default:
      break;
  }
  return state;
}

export default function screen(
  state: ScreenState = { events: [] },
  action: any,
) {
  const ev = state ? state.events || [] : [];
  return {
    ...state,
    events: events(ev, action),
  };
}