declare module "@irysius/grid-math/Vector2" {
    export interface IVector2 {
        x: number;
        y: number;
        type?: string;
    }
    export function create(x: number, y: number, type?: string): IVector2;
    export function zero(type?: string): IVector2;
    export function unit(type?: string): IVector2;
    export function isVector2(v: any, typeToCheck?: string | any): v is IVector2;
    export function add<T extends IVector2, U extends IVector2 = T>(a: T, b: U): T;
    export function subtract<T extends IVector2, U extends IVector2 = T>(a: T, b: U): T;
    export function multiply<T extends IVector2>(v: T, k: number): T;
    export function negate<T extends IVector2>(v: T): T;
    export function areEqual(a: IVector2, b: IVector2, ignoreType?: boolean): boolean;
    export function closeEnough(e: number): (a: IVector2, b: IVector2, ignoreType?: boolean) => boolean;
    export function clone<T extends IVector2>(v: T): T;
}