import type { BlendMode, LayerId } from "./layers";
/**
 * Strongly-typed identifier for persistent canvas documents.
 */
export type DocumentId = string;
/**
 * The current document schema version.
 */
export declare const CURRENT_DOCUMENT_VERSION = 1;
export type BitmapFormat = "png" | "jpeg" | "webp";
export interface SerializedLayer {
    id: LayerId;
    name: string;
    visible: boolean;
    opacity: number;
    blendMode: BlendMode;
    alphaLock?: boolean;
    locked?: boolean;
    dataUrl: string;
}
export interface FuderuDocument {
    id?: DocumentId;
    version: number;
    width: number;
    height: number;
    layers: SerializedLayer[];
    activeLayerId?: LayerId;
}
export interface ExportDocumentOptions {
    bitmap?: BitmapFormat;
    quality?: number;
}
export interface ExportPNGOptions {
    includeBackground?: boolean;
    quality?: number;
}
/**
 * Pipeline that validates and migrates any document schema version
 * forward to CURRENT_DOCUMENT_VERSION.
 */
export declare function migrateDocument(rawDoc: unknown): FuderuDocument;
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