/**
 * Merge multiple ArchRad IR JSON fragments into one graph.
 *
 * Default: union by `node.id` — identical definitions dedupe; conflicting ids → error + stderr report.
 * Optional `prefixFragments`: disjoint union (legacy) — prefix each fragment’s ids.
 */
export declare class FragmentMergeError extends Error {
    constructor(message: string);
}
/** Same `node.id` with incompatible definitions across fragments. */
export declare class FragmentMergeConflictError extends Error {
    readonly reportLines: string[];
    constructor(message: string, reportLines: string[]);
}
/** Prefix node id for merged graph uniqueness. */
export declare function prefixNodeId(prefix: string, nodeId: string): string;
export type MergeIrFragmentsOptions = {
    /** One label per fragment (defaults to fragment-0, fragment-1, …). */
    labels?: string[];
    /**
     * When true: prefix each fragment’s node/edge ids (disjoint union; no cross-fragment id checks).
     * When false (default): merge by global `node.id` with dedupe / conflict detection.
     */
    prefixFragments?: boolean;
};
export type MergeIrFragmentsResult = {
    ir: Record<string, unknown>;
    /** Non-fatal messages (stderr in CLI). */
    warnings: string[];
};
/**
 * Merge IR fragments. Default mode unions on `node.id`; conflicts throw {@link FragmentMergeConflictError}.
 */
export declare function mergeIrFragments(fragments: Record<string, unknown>[], options?: MergeIrFragmentsOptions): MergeIrFragmentsResult;
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