The time handler requires some more work. First, we import other types and functions.

import { State, Level, Object, Enemy, Wall, Movement, isOppositeMovement, onGrid, Difficulty } from "./model"; 
import { update, randomInt, chance, distance, isInt } from "./utils"; 

We define a step function so that we can add the menu later on.

export function step(state: State) {
 return stepLevel(state);
} 

In stepLevel, we can update the objects in the level. First, we update the location of the enemies. We use stepEnemy, which we define later on.

function stepLevel(state: State): State { 
  const level = state.level; 
   
  const enemies = level.enemies.map(enemy => stepEnemy(enemy, level.player, level.walls, level.difficulty)); 

We update the location of the player based on the current movement:

  const player = stepPlayer(level.player, level.currentMovement, level.walls); 

Dots that are near the player, are eaten by the player...