/**
 * Inline Web Worker for IFC entity scanning.
 *
 * Moves the 7-8s entity scanning off the main thread so geometry streaming
 * and UI remain responsive. The scanning logic is embedded as a string to
 * avoid bundler/import issues with Web Workers.
 */
export interface EntityRefWorkerResult {
    expressId: number;
    type: string;
    byteOffset: number;
    byteLength: number;
    lineNumber: number;
}
/**
 * Scan IFC entities in a Web Worker (non-blocking).
 * Sends a structured clone of the buffer to the worker (browser handles copy).
 * Caller keeps the original buffer intact for columnar parsing.
 */
export declare function scanEntitiesInWorker(buffer: ArrayBuffer | SharedArrayBuffer): Promise<EntityRefWorkerResult[]>;
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