export declare const MAX_TRAIL = 48;
export declare class Particle {
    /** Which edge this particle belongs to */
    edgeId: string;
    /** Arc-length position along the edge path (0 → edge.path.totalLength) */
    distance: number;
    /** Movement speed in logical-pixels per second */
    speed: number;
    /** Current world position (computed from arc-length lookup) */
    x: number;
    y: number;
    /** Tangent angle at current position (for streak orientation) */
    angle: number;
    /** Whether this particle is assigned to an edge (false = in pool) */
    active: boolean;
    /**
     * Trail history — circular buffer of past world positions.
     * Stored as interleaved [x0, y0, x1, y1, ...] for cache efficiency.
     * Trail is read from trailStart to trailEnd (inclusive).
     */
    readonly trailBuf: Float32Array;
    trailHead: number;
    trailLen: number;
    trailCap: number;
    /** Reset to default state (called by pool on release/reacquire) */
    reset(): void;
    /** Push a position into the trail circular buffer */
    pushTrail(x: number, y: number): void;
    /**
     * Iterate trail points from oldest to newest.
     * Calls `fn(x, y, alpha)` where alpha is 0 at tail, 1 at head.
     * Safe to call even if trailLen < 2.
     */
    forEachTrailPoint(fn: (x: number, y: number, alpha: number) => void): void;
}
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