Interface Particle

interface Particle {
    a: number;
    active: boolean;
    angularVel: number;
    b: number;
    dirX: number;
    dirY: number;
    emitter: Emitter | null;
    endSize: number;
    g: number;
    life: number;
    maxLife: number;
    r: number;
    rotation: number;
    size: number;
    startSize: number;
    vx: number;
    vy: number;
    x: number;
    y: number;
}