import type { DiagramDTO, DiagramLayout } from '@memoarchitect/tools';
export declare const VIEW_LAYOUT_EXTENSION = ".viewlayout";
/** Companion location beside the SysML file that defines the view. */
export declare function viewLayoutPath(projectRoot: string, diagram: DiagramDTO): string;
export declare function loadViewLayout(projectRoot: string, diagram: DiagramDTO): DiagramLayout | null;
/**
 * Whether a layout says anything the model does not already say: a moved node,
 * a routed connector, or a canvas setting the user changed. A companion exists
 * to record overrides, so a layout that holds none is not worth a file — the
 * view renders identically without it.
 */
export declare function isDefaultViewLayout(layout: DiagramLayout): boolean;
/**
 * Persist a diagram's overrides beside its SysML source. Returns the companion
 * path, or null when there was nothing to persist — a layout that carries no
 * override drops its entry instead, and the companion is removed once it holds
 * no entries at all, so a purely visual toggle never dirties the project.
 */
export declare function saveViewLayout(projectRoot: string, diagram: DiagramDTO, layout: DiagramLayout): string | null;
export declare function loadViewLayouts(projectRoot: string, diagrams: DiagramDTO[]): Record<string, DiagramLayout>;
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