import type { BlockHandler } from "./handler.type.js";
/**
 * Resolve handler for a block type.
 * For unregistered `widget:*`, `html:*`, and `router-slot` types,
 * creates and caches a default handler.
 */
export declare function resolveHandler(type: string): BlockHandler | undefined;
/** Get a registered handler without lazy creation. */
export declare function getHandler(type: string): BlockHandler | undefined;
/** List all registered handler type names. */
export declare function listHandlers(): string[];
/**
 * Register a custom block handler.
 * Overwrites any existing handler for the same type.
 *
 * @example
 * ```ts
 * registerHandler("widget:chart", {
 *   render(raw, attrs) { return `<chart-widget data="${raw}"></chart-widget>`; },
 *   serialize(raw) { return "```widget:chart\n" + raw + "\n```"; },
 * });
 * ```
 */
export declare function registerHandler<const T extends string>(type: T, handler: BlockHandler): void;
/**
 * Remove a previously registered handler.
 * Returns `true` if the handler existed, `false` otherwise.
 */
export declare function unregisterHandler(type: string): boolean;
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