export declare function purgeProps(obj: {
    [k: string]: any;
}, exclude: string[]): {
    [k: string]: any;
};
export declare function first<T>(a: T[]): T;
export declare function last<T>(a: T[]): T;
export declare function coordsToKey<T>(a: T[]): string;
export declare function addToMap<T>(m: {
    [k: string]: T[];
}, k: string, v: T): void;
export declare function removeFromMap<T>(m: {
    [k: string]: T[];
}, k: string, v: T): void;
export declare function getFirstFromMap<T>(m: {
    [k: string]: T[];
}, k: string): T | null;
export declare function isRing(a: number[][]): boolean;
export declare function ringDirection(a: number[][], xIdx?: number, yIdx?: number): string;
export declare function pointInsidePolygon(pt: number[], polygon: number[][], xIdx?: number, yIdx?: number): boolean;
export declare function strArrayArrayToFloat(el: string[][]): number[][];
export declare function strArrayToFloat(el: string[]): number[];