old_contents: import { Game } from './core/game.js';
  import { Entity } from './core/entity.js';
  import { Group } from './core/group.js';
  import { shapes } from './shapes/shapes.js';
  import { vec3, mat4, glMatrix } from 'gl-matrix';
  
  const math = {
    vec3,
    mat4,
    glMatrix
  };
  
  export {
    Game,
    Entity,
    Group,
    shapes,
    math
  }
  
new_contents: import { Game } from './core/game.js';
  import { Entity } from './core/entity.js';
  import { Group } from './core/group.js';
  import { math } from './core/math';
  
  import { shapes } from './shapes/shapes.js';
  
  export {
    Game,
    Entity,
    Group,
    shapes,
    math
  }
  
subject: change math module exported from the core