/**
 * Debug Dashboard — Panel Store
 *
 * Holds the current state of every dashboard widget, keyed by id. An upsert
 * with an existing id overwrites that widget's value in place (the whole point
 * of the dashboard vs. the scrolling log). Plots keep a short ring of recent
 * samples so a freshly-connected viewer can draw the curve immediately.
 *
 * Sibling of log-buffer.ts (LogBuffer) — same singleton-state pattern.
 */
import { type PanelHttpEntry, type PanelWidget } from './panel-types.js';
export declare class PanelStore {
    private widgets;
    /**
     * Create or update a widget from an HTTP body. Returns the resulting
     * widget, or null if the body is invalid (missing/empty id or bad type).
     */
    upsert(body: PanelHttpEntry): PanelWidget | null;
    /** One widget by id, or undefined if unknown. */
    get(id: string): PanelWidget | undefined;
    /** All widgets — for a freshly-connected viewer (snapshot on connect). */
    snapshot(): PanelWidget[];
    /** Remove one widget (by id) or all (no id). Returns the cleared id, or null for "all". */
    clear(id?: string): string | null;
    get size(): number;
}
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