/**
 * Subagent observability overlay.
 *
 * F2 toggles a live tree of running subagents (current tool, token spend,
 * elapsed). Until WS6 ships the Task tool + global subagent registry this
 * overlay subscribes to a no-op registry that emits an empty snapshot. Once
 * WS6 lands, `setRegistry()` will receive a real registry and the overlay
 * begins rendering rows.
 */
import { formatElapsed } from "../format-elapsed.js";
import type { Component } from "../tui.js";
export { formatElapsed };
export interface SubagentSnapshot {
    id: string;
    name: string;
    currentTool?: string;
    tokensIn: number;
    tokensOut: number;
    elapsedMs: number;
    status: "running" | "done" | "error" | "queued";
    depth?: number;
}
export interface SubagentRegistry {
    /** Read current snapshot of every active subagent. WS6 wires this. */
    list(): SubagentSnapshot[];
    /** Subscribe to changes. Returns an unsubscribe function. */
    subscribe(listener: () => void): () => void;
}
/** Empty registry used until WS6 lands the Task tool. */
export declare const NULL_SUBAGENT_REGISTRY: SubagentRegistry;
export interface SubagentOverlayTheme {
    border: (text: string) => string;
    header: (text: string) => string;
    row: (text: string) => string;
    muted: (text: string) => string;
    accent: (text: string) => string;
    error: (text: string) => string;
}
export interface SubagentOverlayOptions {
    registry?: SubagentRegistry;
    theme?: SubagentOverlayTheme;
    maxRows?: number;
}
export declare class SubagentOverlay implements Component {
    private registry;
    private theme;
    private maxRows;
    private unsubscribe?;
    private redraw?;
    constructor(options?: SubagentOverlayOptions);
    /** Wire a new registry (e.g. when WS6 lands and registers the real one). */
    setRegistry(registry: SubagentRegistry): void;
    /** Bind a redraw callback so registry events trigger a TUI re-render. */
    bindRedraw(redraw: () => void): void;
    dispose(): void;
    invalidate(): void;
    render(width: number): string[];
    private formatRow;
    private statusBadge;
    private layoutRow;
    private truncateVisible;
    private padRight;
}
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