import { AssetError, type Result } from '@forgeax/engine-types';
import type { Vec2Point } from './procedural';
export interface PolygonShape {
    readonly contour: readonly Vec2Point[];
    readonly holes?: readonly (readonly Vec2Point[])[];
}
export declare function geometryError(field: string, reason: string): AssetError;
export declare function area(points: readonly Vec2Point[]): number;
export declare function contains(loop: readonly Vec2Point[], p: Vec2Point): boolean;
/** Copy and orient material on the left: outer CCW, holes CW. No input mutation. */
export declare function preparePolygon(shape: PolygonShape): Result<Vec2Point[][], AssetError>;
export declare function triangulatePolygon(loops: readonly (readonly Vec2Point[])[]): Result<number[], AssetError>;
/** Inset offset-line intersections. Refuse topology changes rather than clipping silently. */
export declare function insetPolygon(loops: Vec2Point[][], distance: number): Result<Vec2Point[][], AssetError>;
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