/**
 * Annotation data types and constants for the screenshot annotation canvas.
 * All coordinates are normalized to 0..1 ratios relative to screenshot dimensions.
 */
export type AnnotationTool = 'brush' | 'arrow' | 'text';
export interface Point {
    x: number;
    y: number;
}
export interface BrushAnnotation {
    kind: 'brush';
    points: Point[];
    color: string;
    strokeWidth: number;
}
export interface ArrowAnnotation {
    kind: 'arrow';
    start: Point;
    end: Point;
    color: string;
    strokeWidth: number;
}
export interface TextAnnotation {
    kind: 'text';
    position: Point;
    content: string;
    color: string;
    fontSize: number;
}
export type Annotation = BrushAnnotation | ArrowAnnotation | TextAnnotation;
export declare const COLOR_PALETTE: readonly string[];
export declare const DEFAULT_COLOR = "#ef4444";
export declare const STROKE_WIDTHS: readonly number[];
export declare const DEFAULT_STROKE_WIDTH = 3;
export declare const DEFAULT_FONT_SIZE = 16;
export declare const UNDO_STACK_LIMIT = 50;
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