export declare class Notice {
    private stateValue;
    private messageValue;
    private task?;
    private lifetime;
    private timer?;
    get state(): Notice.State;
    set state(value: Notice.State);
    private listeners;
    get message(): string;
    set message(value: string);
    private constructor();
    listen(listener: Notice.Listener): void;
    unlisten(listener: Notice.Listener): void;
    private emit;
    private execute;
    private startCloseTimer;
    close(): void;
    private clearTimer;
    static delay(message: string, task: Notice.Task, lifetime?: number): Notice;
    static execute(message: string, task: Notice.Task, lifetime?: number): Notice;
    static succeeded(message: string, lifetime?: number): Notice;
    static failed(message: string, lifetime?: number): Notice;
    static warn(message: string, lifetime?: number): Notice;
}
export declare namespace Notice {
    type State = "delayed" | "executing" | "success" | "warning" | "failed" | "closed";
    type Listener = (notice: Notice) => void;
    type Task = (notice: Notice) => Promise<[boolean, string]>;
}