import type { ObservableOptions } from "../types.js";
/**
 * HtmlBoolean is a special type that extends boolean but has custom behavior
 * for HTML attribute conversion. It treats empty strings and 'true' as true,
 * and everything else as false, which is consistent with HTML boolean attributes.
 */
export declare class HtmlBoolean {
    private _value;
    constructor(value: boolean | string | undefined);
    /**
     * Convert to string representation for HTML attributes
     */
    toString(): string;
    /**
     * ValueOf returns the primitive boolean value
     */
    valueOf(): boolean;
    /**
     * Get the boolean value
     */
    get value(): boolean;
}
export declare const HtmlBooleanObservableOptions: ObservableOptions<boolean>;