/**
 * The per-end anchor lock of a link, as transferred between diagrams. `frozen`
 * is the side captured when the user locked the anchor; it is only meaningful
 * while `locked` is true.
 */
export interface AnchorLockState<S> {
    source_side_locked: boolean;
    source_side_frozen: S | undefined;
    target_side_locked: boolean;
    target_side_frozen: S | undefined;
}
/**
 * Derive the lock state a destination link should take from its layout source.
 *
 * A faithful copy of both flags AND frozen sides — copying only the boolean
 * would let the destination recompute the frozen side from its own geometry,
 * defeating the lock. The frozen side is normalized away when the end is
 * unlocked, so transferring an unlocked source also clears a previously-locked
 * destination (the lock can be released by re-applying an "auto" layout).
 *
 * Generic over the side type so the test can use lightweight stand-ins.
 */
export declare function transferAnchorLock<S>(src: AnchorLockState<S>): AnchorLockState<S>;