/**
 * For timing of delayed events
 */
export declare class Delay {
    private time;
    private next_pop;
    private line;
    private _action;
    /**
     * @param line A space separated mix of event names and delay timings
     *
     * `.set_line('500 spawn')` will fire a `spawn` event after 500ms
     *
     * `.set_line('500')` will fire an `end` event after 500ms
     */
    set_line(line: string): this;
    /**
     * Query the fired events in the update loop with `delay.action`
     */
    get action(): string;
    /**
     * Call this in your update loop
     * @param delta in milliseconds
     */
    update(delta: number): void;
}
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