import { Config, InternalConfig, InternalHandler } from './types';
export declare class Controller {
    /** Internal timer to  */
    private timeout?;
    /** Sequence that stores the scanned barcode */
    private sequence;
    /** Listeners attached to elements by this instance */
    private listener?;
    config: InternalConfig;
    handler?: InternalHandler;
    constructor(config?: Config, handler?: InternalHandler);
    /**
     * Adds character(s) to the internal sequence. Returns true if the sequence was reset in the process.
     */
    private addToSequence;
    /**
     * Evaluates the sequence against the configured symbologies.
     */
    private evaluateSequence;
    /**
     * Resets the internal sequence to the default state.
     */
    private resetSequence;
    /**
     * Handles the `keydown` event.
     */
    private keyDown;
    /**
     * Attaches a new handler to the controller.
     */
    applyHandler(handler: InternalHandler): void;
    /**
     * Attaches a new config to the controller.
     */
    applyConfig(config: Config): void;
    /**
     * Attaches a listener to the `config.target` element.
     */
    bind(): (() => void) | undefined;
    /**
     * Executes side effects (attaching listeners to a `config.target`). Ran on
     * each render.
     */
    effect(): () => void;
    /**
     * Cleans all side effects (listeners, timeouts). When the symbology scanner is
     * destroyed (in React, when the component is unmounted.)
     */
    clean(): void;
}