import { type Task, type TaskEvent, type TaskState } from "./model.ts";
export type TaskTransitionErrorCode = "scope_activity_required" | "scope_reason_required";
export declare class TaskTransitionError extends Error {
    readonly code: TaskTransitionErrorCode | undefined;
    constructor(message: string, code?: TaskTransitionErrorCode);
}
export declare function reduceTaskState(state: TaskState, event: TaskEvent): TaskState;
export declare function replayTaskEvents(events: TaskEvent[]): TaskState;
export declare function hasBlockingFailedEvidence(task: Task, evidenceId: string, scope: {
    criterionId?: string;
    stepId?: string;
}): boolean;