/**
 * Dep-tree text and Mermaid rendering helpers.
 * @task T10064
 * @epic T9834
 */
/** Node shape used by rendering helpers. */
export interface TreeNode {
    id: string;
    title: string;
    status: string;
    depends: string[];
}
/** Edge shape. */
export interface TreeEdge {
    from: string;
    to: string;
}
/**
 * Compute the critical (longest) path through a dep DAG using topological DP.
 * Returns task IDs from the path start to end.
 *
 * @param nodes   - DAG nodes.
 * @param edges   - DAG edges (from dep to dependent).
 * @param epicId  - Root epic ID to exclude from end-node selection.
 */
export declare function computeCriticalPath(nodes: TreeNode[], edges: TreeEdge[], epicId: string): string[];
/**
 * Render a simple ASCII dep tree.
 * Groups tasks by their immediate deps (roots first, then dependents).
 *
 * @param nodes        - DAG nodes.
 * @param _edges       - DAG edges (unused in text rendering).
 * @param criticalPath - IDs on the critical path (marked with **).
 */
export declare function renderTextTree(nodes: TreeNode[], _edges: TreeEdge[], criticalPath: string[]): string;
/**
 * Render a Mermaid graph TD block.
 * Escapes double-quotes in task titles to prevent parse errors.
 *
 * @param nodes        - DAG nodes.
 * @param edges        - DAG edges.
 * @param criticalPath - IDs on the critical path (styled with critical class).
 */
export declare function renderMermaidTree(nodes: TreeNode[], edges: TreeEdge[], criticalPath: string[]): string;
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