Interface b2ContactHitEvent

interface b2ContactHitEvent {
    approachSpeed: number;
    normal: b2Vec2;
    point: b2Vec2;
    shapeIdA: b2ShapeId;
    shapeIdB: b2ShapeId;
    clone(): this;
    delete(): void;
    deleteLater(): this;
    isAliasOf(other: ClassHandle): boolean;
    isDeleted(): boolean;
    [key: number]: () => void;
}