import type { TraceFrame } from "../types.js";
export interface FlatFrame {
    frame: TraceFrame;
    depth: number;
    /** Position in pre-order traversal — root is 0. */
    preOrderIndex: number;
    /** Index among this frame's siblings (0 for root). */
    siblingIndex: number;
}
/**
 * Flatten a call tree into a pre-order array. Each entry carries the depth
 * and indices needed to reconstruct the tree visually (e.g. for a call-tree
 * table) without recursion at render time.
 */
export declare function flattenCallTree(root: TraceFrame): FlatFrame[];
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