import { Task } from "todo.json";
export declare function readTasks(dataPath: string): Task[];
export declare function writeTasks(dataPath: string, tasks: Task[]): void;
export declare function appendTasks(dataPath: string, tasks: Task[]): number;
export declare function maxWidth(tasks: {
    index: number;
    task: Task;
}[], field: "contexts" | "projects" | "text" | "due"): number;
export declare function colorTask(task: Task): "red" | "yellow" | "cyan" | null;
export declare function urgency(task: Task): number;
export declare function parseIds(ids: string[], maxId: number, onError: (msg: string) => void): number[];
export declare function filterByField(field: "projects" | "contexts", values: string[] | undefined, and: boolean, without: boolean): (task: Task) => boolean;