export type IfcSchemaVersion = 'IFC2X3' | 'IFC4' | 'IFC4X3' | 'IFC5';
/**
 * Convert an entity type name from one IFC schema version to another.
 *
 * @param entityType - UPPERCASE entity type name (e.g., 'IFCWALL')
 * @param fromSchema - Source schema version
 * @param toSchema - Target schema version
 * @returns The mapped entity type name, or the original if no mapping needed
 */
export declare function convertEntityType(entityType: string, fromSchema: IfcSchemaVersion, toSchema: IfcSchemaVersion): string;
/**
 * Convert a raw STEP entity line from one schema version to another.
 *
 * Handles:
 * 1. Entity type name conversion
 * 2. Attribute count adjustment (trimming trailing attrs for older schemas)
 * 3. Skipping entities that have no valid representation in the target schema
 *
 * @param line - Raw STEP entity line (e.g., "#1=IFCWALL('guid',...);")
 * @param fromSchema - Source schema version
 * @param toSchema - Target schema version
 * @returns Converted line (entities without valid target representation become IFCPROXY placeholders)
 */
export declare function convertStepLine(line: string, fromSchema: IfcSchemaVersion, toSchema: IfcSchemaVersion): string;
/**
 * Check if a conversion between two schema versions requires entity type changes.
 */
export declare function needsConversion(fromSchema: IfcSchemaVersion, toSchema: IfcSchemaVersion): boolean;
/**
 * Get human-readable description of what a conversion entails.
 */
export declare function describeConversion(fromSchema: IfcSchemaVersion, toSchema: IfcSchemaVersion): string;
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