backend/libs/three/extras/ShapeUtils.d.ts

export interface Vec2 {
	x: number;
	y: number;
}

export namespace ShapeUtils {
	function area(contour: Vec2[]): number;
	function triangulateShape(contour: Vec2[], holes: Vec2[][]): number[][];
	function isClockWise(pts: Vec2[]): boolean;
}