export interface Diff {
    patch: unknown;
    forcedSnapshot: boolean;
}
/**
 * Generate an RFC 7396 merge patch transforming `oldVal` into `newVal`.
 *
 * Only object roots produce a recursive patch; any other root forces a snapshot.
 */
export declare function diff(oldVal: unknown, newVal: unknown): Diff;
/**
 * Apply an RFC 7396 merge patch to a target value, returning the result.
 *
 * Objects merge recursively; a null patch value deletes that key; any other patch value
 * (scalar or array) replaces the target wholesale.
 */
export declare function merge(target: unknown, patch: unknown): unknown;
/** Structural equality for JSON values. */
export declare function deepEqual(a: unknown, b: unknown): boolean;
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