/**
 * Generic factory that maps string keys to constructor functions.
 * Used for instantiating Block and Element types dynamically.
 */
export declare class MappingFactory<T> {
    private mapping;
    constructor(mapping: Record<string, new (...args: unknown[]) => T>);
    /**
     * Instantiate an object by its type key.
     */
    build(typeKey: string): T;
    /**
     * Check if a type key is registered.
     */
    has(typeKey: string): boolean;
    /**
     * Get all registered type keys.
     */
    getKeys(): string[];
}
export declare class UnknownFactoryKeyError extends Error {
    constructor(key: string, validKeys: string[]);
}
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