import { PoNode } from '../../po-helpers.js';
/** §21.4.2.27 `dgm:pt@type` — what a point is in the model. */
export type PointType = 'doc' | 'node' | 'asst' | 'parTrans' | 'sibTrans' | 'pres';
/** One point of the data model. */
export interface DiagramPoint {
    readonly id: string;
    readonly type: PointType;
    /** `dgm:t` — the point's text, as the `a:txBody` every other reader takes. */
    readonly text?: PoNode;
    /** `dgm:spPr` — the formatting the user overrode on this node. */
    readonly spPr?: PoNode;
    /** `dgm:prSet` — presentation properties (placeholder text, custom sizes). */
    readonly prSet?: PoNode;
}
/**
 * The data part as the layout engine asks about it: the point tree recovered
 * from the connection list, plus the transition points that go with each edge.
 */
export declare class DiagramData {
    private readonly byId;
    private readonly kids;
    /** The document point every layout starts from. */
    readonly root: DiagramPoint | undefined;
    /** §21.4.2.4 `dgm:bg` — the fill painted behind the whole diagram. */
    readonly background: PoNode | undefined;
    constructor(tree: ReadonlyArray<PoNode>);
    /** The point with this id, if the model holds one. */
    point(id: string): DiagramPoint | undefined;
    /**
     * The children of a point, in the order the connections give them.
     *
     * @param id       The parent's model id.
     * @param ptType   Which kind of child to return — `node` skips the
     *                 transitions, `sibTrans` returns them instead.
     */
    children(id: string, ptType?: 'node' | 'sibTrans' | 'parTrans'): Array<DiagramPoint>;
    /**
     * How many generations of `node` points the model holds below its root.
     *
     * §21.4.3.3 — a layout branches on this (`func="maxDepth" op="gte" val="2"`):
     * the same part lays a chevron out as one box when the nodes have no
     * children and as a labelled box over a body when they do.
     */
    get depth(): number;
    /** The plain text of a point's `dgm:t`, paragraphs joined by newlines. */
    static textOf(pt: DiagramPoint | undefined): string;
}