import type { TraceFrame } from "../types.js";
export interface WalkVisitor {
    /**
     * Called when entering a frame, before any of its children. Return `false`
     * to stop the entire walk; return `"skip"` to skip this frame's children
     * (the exit hook still fires).
     */
    enter?: (frame: TraceFrame, depth: number, index: number) => void | false | "skip";
    /**
     * Called when leaving a frame, after all children have been visited. Return
     * `false` to stop the entire walk.
     */
    exit?: (frame: TraceFrame, depth: number, index: number) => void | false;
}
/**
 * Depth-first walk of a call tree using an explicit stack. Safe for
 * arbitrarily deep trees (will not blow the JS call stack).
 *
 * `index` is the position among the parent's children (0 for the root).
 */
export declare function walkCallTree(root: TraceFrame, visitor: WalkVisitor): void;
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