import { Directive } from '@alwatr/directive';
import type { BindingValue } from './type.js';
/**
 * A declarative DOM directive that binds an element's `textContent` to a view model property.
 *
 * Syntax: `bind_text="namespace.propertyName"`
 *
 * It subscribes to the projected computed signal of the namespace and surgically updates
 * the element's `textContent` whenever the property changes.
 *
 * Supports deferred viewport initialization if the `lazy_bind` attribute is present on the element.
 *
 * @example
 * ```html
 * <!-- Immediate binding (default) -->
 * <h2 bind_text="user.fullName">Loading...</h2>
 *
 * <!-- Lazy binding (evaluated only when element enters the viewport) -->
 * <p bind_text="article.summary" lazy_bind>Loading summary...</p>
 * ```
 */
export declare class BindTextDirective extends Directive {
    /**
     * Attribute flag used to defer binding initialization until the element enters the viewport.
     * If `lazy_bind` attribute exists, this is non-null.
     */
    protected accessor lazyBinding_: null | string;
    /**
     * Initializes the directive.
     * Checks if lazy binding is enabled via `lazy_bind`.
     * If yes, delegates the initialization to `lazyInit_`; otherwise, initializes immediately.
     */
    protected init_(): void;
    /**
     * Reactive state containing the current bound value.
     * Triggers an element update on assignment.
     */
    protected accessor bindingValue_: BindingValue;
    /**
     * Main binding initialization logic. Parses the namespace and property key,
     * retrieves the ViewModel signal, and subscribes to state changes.
     */
    protected bindingInit_(): void;
    /**
     * Renders the current bound value to the element's `textContent`.
     * Nullish values render as an empty string.
     */
    protected update_(): void;
}
/**
 * Helper to register `BindTextDirective` lazily under the `bind_text` attribute.
 */
export declare const registerBindTextDirective: import("@alwatr/directive").RegisterDirectiveFunction;
//# sourceMappingURL=directive_bind_text.d.ts.map