/**
 * Pure overlay merge used to collapse ordered document-graph fragments into one
 * effective document. Later fragments win.
 *
 * Merge rules (deterministic, no delete/tombstone semantics):
 * - Two plain objects at the same key merge recursively.
 * - Arrays, scalars, and `null` replace the prior value wholesale.
 * - A plain object overwrites a scalar, and a scalar overwrites a plain object.
 *
 * Inputs are never mutated; new objects are returned.
 */
type PlainObject = Record<string, unknown>;
/**
 * Merge two plain objects, with `overlay` winning on conflicts. Neither input is
 * mutated.
 */
export declare function deepMerge(base: PlainObject, overlay: PlainObject): PlainObject;
/**
 * Merge an ordered list of plain-object fragments. Earlier fragments are the
 * base; later fragments overlay them. An empty list yields an empty object; a
 * single fragment yields an equivalent (deeply copied) object.
 */
export declare function deepMergeAll(fragments: ReadonlyArray<PlainObject>): PlainObject;
export {};
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