import { rand } from '@df0/hashing';
import { Abstract, PerlinConfig, Rectangle, WorldCoords } from '@df0/types';
declare type Vector = {
    x: number;
    y: number;
};
export declare const valueOf: (v: Vector) => [number, number];
export declare type PerlinRand = ReturnType<typeof rand>;
export declare type GridPoint = WorldCoords & {
    __value: never;
};
export declare type PerlinOctave = Abstract<number, 'PerlinOctave'>;
export declare const PerlinOctave: {
    _0: PerlinOctave;
    _1: PerlinOctave;
    _2: PerlinOctave;
};
export declare function right(topLeft: GridPoint, scale: number): GridPoint;
export declare function up(topLeft: GridPoint, scale: number): GridPoint;
export declare function isGridPoint(coords: WorldCoords, scale: number): coords is GridPoint;
export declare function getGridPoint(bottomLeft: WorldCoords, scale: number): GridPoint;
export declare function getPerlinChunks(footprint: Rectangle, lengthScale: number): Iterable<Rectangle>;
export declare type Quadrant = Abstract<string, 'Quadrant'>;
export declare const Quadrant: {
    TopRight: Quadrant;
    TopLeft: Quadrant;
    BottomLeft: Quadrant;
    BottomRight: Quadrant;
};
export declare function getQuadrant(bottomLeft: GridPoint): Quadrant;
export declare function getCachedGradient(quadrant: Quadrant, coords: GridPoint, config: PerlinConfig, pow: PerlinOctave): Vector;
export {};