/**
 * Reactive annotation state factory.
 * Follows the createWidgetState() pattern — internal $state variables,
 * returned object with getters and action methods.
 */
import type { Annotation, AnnotationTool, Point } from './annotation-types.js';
export interface AnnotationState {
    readonly tool: AnnotationTool;
    readonly color: string;
    readonly strokeWidth: number;
    readonly fontSize: number;
    readonly annotations: readonly Annotation[];
    readonly activeAnnotation: Annotation | null;
    readonly textInputPosition: Point | null;
    readonly textInputValue: string;
    readonly canUndo: boolean;
    readonly canRedo: boolean;
    setTool(tool: AnnotationTool): void;
    setColor(color: string): void;
    setStrokeWidth(width: number): void;
    setFontSize(size: number): void;
    startBrush(point: Point): void;
    continueBrush(point: Point): void;
    commitBrush(): void;
    startArrow(point: Point): void;
    updateArrow(end: Point): void;
    commitArrow(): void;
    startText(position: Point): void;
    updateTextInput(value: string): void;
    commitText(): void;
    cancelText(): void;
    undo(): void;
    redo(): void;
    clear(): void;
}
export declare function createAnnotationState(): AnnotationState;
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