PlatformEffectorCompOpt:

ignoreSides?: Vec2[]

If the object is about to collide and the collision normal direction is in here (i.e. the object is moving roughly in this direction), the object won't collide. Should be a list of unit vectors `LEFT`, `RIGHT`, `UP`, or `DOWN`. Defaults to `[UP]`, i.e. the object will only be able to pass through when it is jumping upwards, but will collide when it is moving downwards or sideways.

shouldCollide?(this: GameObj, obj: GameObj, normal: Vec2): boolean

A function that determines whether the object should collide. If present, it overrides the `ignoreSides`; if absent, it is automatically created from `ignoreSides`.