import { DeviceValueReader, InputState, KeyboardValueReaderDefinition } from "../../../interfaces/input.d.ts";
/**
 * Types of keyboard input sources
 */
export type KeyboardSourceType = 'key';
/**
 * Options for configuring a keyboard value reader
 */
export interface KeyboardReaderOptions {
    /**
     * Whether to use delta state instead of current state
     * When true, the source will only return true on the initial key press
     */
    useDelta?: boolean;
}
/**
 * Reads values from keyboard input states
 */
export declare class KeyboardValueReader implements DeviceValueReader {
    /**
     * Always 'key' for keyboard readers.
     */
    readonly sourceType: KeyboardSourceType;
    /**
     * The key code to monitor (e.g. "KeyA", "Space", "ArrowUp")
     */
    readonly sourceKey: string;
    /**
     * When true, reads from delta (only true on the frame the key was first pressed/released)
     */
    private readonly useDelta;
    /**
     * Creates a new KeyboardValueReader
     *
     * @param keyCode - KeyboardEvent.code value (e.g. "KeyA", "Space", "ArrowUp")
     * @param options
     */
    constructor(keyCode: string, options?: KeyboardReaderOptions);
    /**
     * Gets the value of the key state. Returns undefined for non-keyboard input states.
     *
     * @param state
     */
    getValue(state: InputState): boolean | undefined;
    /**
     * Creates a KeyboardValueReader from a string representation
     *
     * @param sourceKey - KeyboardEvent.code value (e.g. "KeyA", "Space")
     * @param options
     */
    static fromString(sourceKey: string, options?: KeyboardReaderOptions): KeyboardValueReader;
    /**
     * Returns a JSON-serializable representation of this keyboard value reader.
     */
    toJSON(): KeyboardValueReaderDefinition;
}