React Native Accelerometer Maze: Get entities

get entities in App.js

// App.js
_getEntities = (engine, world, maze, ball, goal) => {
  const entities = {
    physics: {
      engine,
      world
    },
    playerBall: {
      body: ball,
      bgColor: '#FF5877',
      borderColor: '#FFC1C1',
      renderer: Circle
    },

    goalBox: {
      body: goal,
      size: [GOAL_SIZE, GOAL_SIZE],
      color: '#414448',
      renderer: Rectangle
    }

  }

  const walls = Matter.Composite.allBodies(maze);
  walls.forEach((body, index) => {

    const { min, max } = body.bounds;
    const width = max.x - min.x;
    const height = max.y - min.y;

    Object.assign(entities, {
      ['wall_' + index]: {
        body: body,
        size: [width, height],
        color: '#fbb050',
        renderer: Rectangle
      }
    });
  });


  return entities; 
}