import { vec2 } from 'linearly';
export declare function toFixedSimple(a: number, fractionDigits?: number): string;
export declare function normalizeOffset(offset: number, max: number): number;
/**
 * Normalize an index to the range 0 to length - 1. Negative values are interpreted as offsets from the end. If the index is out of bounds, it is clamped to the nearest bound.
 */
export declare function normalizeIndex(index: number, length: number): number;
/**
 * Memoizes a function that takes a single object argument, using a WeakMap.
 */
export declare function memoize<Arg extends object, ReturnType>(f: (arg: Arg) => ReturnType): (arg: Arg) => ReturnType;
export type PartialBy<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
/**
 * Minimize a function of two variables using the BFGS method.
 * @param f The objective function to minimize
 * @param initial The initial guess
 * @returns The pair of vec2 that minimizes the function
 */
export declare const minimizeVec2: (f: (v: vec2) => number, initial: vec2) => vec2;
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