/**
 * Fixed-capacity circular buffer. When full, new items overwrite the oldest.
 */
export declare class RingBuffer<T> {
    private buffer;
    private head;
    private count;
    private readonly capacity;
    constructor(capacity: number);
    push(item: T): void;
    get size(): number;
    /** Returns entries oldest-first */
    toArray(): T[];
    clear(): void;
}
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