import { type WorkflowConfig, type WorkflowRestartPoint, type WorkflowResumePointEntry, type WorkflowStep } from '../../core/models/index.js';
export interface TaskRetryStartPathContext {
    projectCwd: string;
    lookupCwd: string;
}
export interface ResolvedTaskRetryPath {
    segments: string[];
}
/** A selectable authored leaf step in the restart tree. */
export interface TaskRetryRestartTreeLeaf {
    kind: 'leaf';
    step: WorkflowStep;
    /** Nesting depth (root steps are 0, children of a workflow_call are +1). */
    depth: number;
    /** Unique position path within the tree, used to derive a stable row value. */
    id: string;
    restartPoint: WorkflowRestartPoint;
}
/** A non-selectable workflow_call heading that expands its child steps. */
export interface TaskRetryRestartTreeHeading {
    kind: 'heading';
    step: WorkflowStep;
    depth: number;
    id: string;
    children: TaskRetryRestartTreeNode[];
    /** Reason the branch could not be expanded (degraded rendering). */
    note?: string;
}
export type TaskRetryRestartTreeNode = TaskRetryRestartTreeLeaf | TaskRetryRestartTreeHeading;
export declare function formatTaskRetryPath(segments: readonly string[]): string;
/**
 * Expand a workflow into a restart tree: authored non-call steps become
 * selectable leaves carrying their cumulative restart stack, and each
 * workflow_call step becomes a heading that recursively expands its callee.
 * A branch that cannot be resolved (unknown/non-callable/cycle/depth) is kept
 * as a heading annotated with the reason instead of aborting the whole tree.
 * Headings that expand to no selectable descendant are pruned.
 */
export declare function buildTaskRetryRestartTree(rootWorkflow: WorkflowConfig, context: TaskRetryStartPathContext): TaskRetryRestartTreeNode[];
export declare function resolveTaskRetryStackPath(rootWorkflow: WorkflowConfig, stack: readonly WorkflowResumePointEntry[], context: TaskRetryStartPathContext, allowParallelEntries: boolean): ResolvedTaskRetryPath | undefined;
export declare function validateTaskRetryRestartPoint(rootWorkflow: WorkflowConfig, restartPoint: WorkflowRestartPoint, context: TaskRetryStartPathContext): void;
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