/**
 * Check if value is a bigint.
 * @param x a value
 * @returns is bigint?
 */ export declare function is(x: unknown): x is bigint;
/**
 * Compare two bigints.
 * @param x a bigint
 * @param y another bigint
 * @returns x<y: -ve, x=y: 0, x>y: +ve
 */ export declare function compare(x: bigint, y: bigint): number;
/**
 * Get the absolute of a bigint.
 * @param x a bigint
 * @returns |x|
 */ export declare function abs(x: bigint): bigint;
/**
 * Get the sign of a bigint.
 * @param x a bigint
 * @returns x>0: 1n, x<0: -1n, x=0: 0n
 */ export declare function sign(x: bigint): bigint;
/**
 * Perform floor-divison of two bigints (\\).
 * @param x dividend
 * @param y divisor
 * @returns ⌊x/y⌋
 */ export declare function floorDiv(x: bigint, y: bigint): bigint;
/**
 * Perform ceiling-divison of two bigints.
 * @param x dividend
 * @param y divisor
 * @returns ⌈x/y⌉
 */ export declare function ceilDiv(x: bigint, y: bigint): bigint;
/**
 * Perform rounded-divison of two bigints.
 * @param x divisor
 * @param y dividend
 * @returns [x/y]
 */ export declare function roundDiv(x: bigint, y: bigint): bigint;
/**
 * Find the remainder of x/y with sign of x (truncated division).
 * @param x dividend
 * @param y divisor
 * @returns trunc(x % y)
 */ export declare function rem(x: bigint, y: bigint): bigint;
/**
 * Find the remainder of x/y with sign of y (floored division).
 * @param x dividend
 * @param y divisor
 * @returns floor(x % y)
 */ export declare function mod(x: bigint, y: bigint): bigint;
/**
 * Find the remainder of x/y with +ve sign (euclidean division).
 * @param x dividend
 * @param y divisor
 * @returns x/y>0: floor(x % y), x/y<0: ceil(x % y)
 */ export declare function modp(x: bigint, y: bigint): bigint;
/**
 * Constrain a bigint within a minimum and a maximum value.
 * @param x a bigint
 * @param minv minimum value
 * @param maxv maximum value
 * @returns x<min: min, x>max: max, x
 */ export declare function constrain(x: bigint, minv: bigint, maxv: bigint): bigint;
export { constrain as clamp };
/**
 * Re-map a bigint from one range to another.
 * @param x a bigint
 * @param r lower bound of current range
 * @param R upper bound of current range
 * @param t lower bound of target range
 * @param T upper bound of target range
 * @returns ∈ [ymin, ymax]
 */ export declare function remap(x: bigint, r: bigint, R: bigint, t: bigint, T: bigint): bigint;
export { remap as map };
/**
 * Linearly interpolate a bigint between two bigints.
 * @param x start bigint
 * @param y stop bigint
 * @param t interpolant ∈ [0, 1]
 * @returns ∈ [x, y]
 */ export declare function lerp(x: bigint, y: bigint, t: number): bigint;
/**
 * Check if bigint is a power-of-2.
 * @param x a bigint
 * @returns 2ⁱ = x? | i = +ve integer
 */ export declare function isPow2(x: bigint): boolean;
/**
 * Check if bigint is a power-of-10.
 * @param x a bigint
 * @returns 10ⁱ = x? | i = +ve integer
 */ export declare function isPow10(x: bigint): boolean;
/**
 * Find largest power-of-2 less than or equal to given bigint.
 * @param x a bigint
 * @returns 2ⁱ | 2ⁱ ≤ x and 2ⁱ > x/2
 */ export declare function prevPow2(x: bigint): bigint;
/**
 * Find largest power-of-10 less than or equal to given bigint.
 * @param x a bigint
 * @returns 10ⁱ | 10ⁱ ≤ x and 10ⁱ > x/10
 */ export declare function prevPow10(x: bigint): bigint;
/**
 * Find smallest power-of-2 greater than or equal to given bigint.
 * @param x a bigint
 * @returns 2ⁱ | 2ⁱ ≥ x and 2ⁱ < 2x
 */ export declare function nextPow2(x: bigint): bigint;
/**
 * Find smallest power-of-10 greater than or equal to given bigint.
 * @param x a bigint
 * @returns 10ⁱ | 10ⁱ ≥ x and 10ⁱ < 10x
 */ export declare function nextPow10(x: bigint): bigint;
/**
 * Find the base-2 logarithm of a bigint.
 * @param x a bigint
 * @returns log₂(x)
 */ export declare function log2(x: bigint): bigint;
/**
 * Find the base-10 logarithm of a bigint.
 * @param x a bigint
 * @returns log₁₀(x)
 */ export declare function log10(x: bigint): bigint;
/**
 * Find the square root of a bigint.
 * @param x a bigint
 * @returns √x
 */ export declare function sqrt(x: bigint): bigint | null;
/**
 * Find the cube root of a bigint.
 * @param x a bigint
 * @returns ³√x
 */ export declare function cbrt(x: bigint): bigint | null;
/**
 * Find the nth root of a bigint.
 * @param x a bigint
 * @param n nth root (1n)
 * @returns ⁿ√x
 */ export declare function root(x: bigint, n?: bigint): bigint | null;
/**
 * List all divisors of a bigint, except itself.
 * @param x a bigint
 * @returns proper divisors (factors)
 */ export declare function properDivisors(x: bigint): bigint[];
export { properDivisors as aliquotParts };
/**
 * Sum all proper divisors of a bigint.
 * @param x a bigint
 * @returns Σdᵢ | dᵢ is a divisor of x and ≠x
 */ export declare function aliquotSum(x: bigint): bigint;
/**
 * Find the least prime number which divides a bigint.
 * @param x a bigint
 * @returns least prime factor
 */ export declare function minPrimeFactor(x: bigint): bigint;
export { minPrimeFactor as leastPrimeFactor };
/**
 * Find the greatest prime number which divides a bigint.
 * @param x a bigint
 * @returns greatest prime factor
 */ export declare function maxPrimeFactor(x: bigint): bigint;
export { maxPrimeFactor as greatestPrimeFactor };
/**
 * Find the prime factors of a bigint.
 * @param x a bigint
 * @returns [f₀, f₁, ...] | fᵢ divides x and is prime
 */ export declare function primeFactors(x: bigint): bigint[];
/**
 * Find the prime factors and respective exponents of a bigint.
 * @param x a bigint
 * @returns [[f₀, e₀], [f₁, e₁], ...] | fᵢ is a prime factor of x and eᵢ is its exponent
 */ export declare function primeExponentials(x: bigint): [bigint, bigint][];
/**
 * Check if bigint is prime.
 * @param x a bigint
 * @returns is divisible by 1n and itself only?
 */ export declare function isPrime(x: bigint): boolean;
/**
 * Find the greatest common divisor of bigints.
 * @param xs a list of bigints
 * @returns gcd(x₁, x₂, ...)
 */ export declare function gcd(...xs: bigint[]): bigint;
export { gcd as hcf };
/**
 * Find the least common multiple of bigints.
 * @param xs a list of bigints
 * @returns lcm(x₁, x₂, ...)
 */ export declare function lcm(...xs: bigint[]): bigint;
/**
 * Find the factorial of a bigint.
 * @param n a bigint
 * @param k denominator factorial [0]
 * @returns P(n, k); k=0: n!, k>0: n!/k!
 */ export declare function factorial(n: bigint, k?: bigint): bigint;
/**
 * Find the number of ways to choose k elements from a set of n elements.
 * @param n elements in source set
 * @param k elements in choose set
 * @returns C(n, k)
 */ export declare function binomial(n: bigint, k: bigint): bigint;
/**
 * Find the number of ways to put n objects in m bins (n=sum(kᵢ)).
 * @param ks objects per bin (kᵢ)
 * @returns n!/(k₁!k₂!...) | n=sum(kᵢ)
 */ export declare function multinomial(...ks: bigint[]): bigint;
/**
 * Find the length of hypotenuse.
 * @param xs lengths of perpendicular sides (x, y, z, ...)
 * @returns √(x² + y² + z²)
 */ export declare function hypot(...xs: bigint[]): bigint;
/**
 * Find the sum of bigints (Σ).
 * @param xs bigints
 * @returns Σxᵢ
 */ export declare function sum(...xs: bigint[]): bigint;
/**
 * Find the product of bigints (∏).
 * @param xs bigints
 * @returns ∏xᵢ
 */ export declare function product(...xs: bigint[]): bigint;
/**
 * Find the value separating the higher and lower halves of bigints.
 * @param xs a list of bigints
 * @returns xₘ | sort(xs) = [..., xₘ, ...]
 */ export declare function median(...xs: bigint[]): bigint;
/**
 * Find the values that appear most often.
 * @param xs a list of bigints
 * @returns [xₘ₁, xₘ₂, ...] | count(xₘᵢ) ≥ count(xᵢ) ∀ xᵢ ∈ xs
 */ export declare function modes(...xs: bigint[]): bigint[];
/**
 * Find the smallest bigint.
 * @param xs bigints
 * @returns min(xs)
 */ export declare function min(...xs: bigint[]): bigint;
/**
 * Find the largest bigint.
 * @param xs bigints
 * @returns max(xs)
 */ export declare function max(...xs: bigint[]): bigint;
/**
 * Find the minimum and maximum bigint.
 * @param xs bigints
 * @returns [min, max]
 */ export declare function range(...xs: bigint[]): [bigint, bigint];
/**
 * Find the mean of squared deviation of bigints from its mean.
 * @param xs a list of bigints
 * @returns σ² = E[(xs - µ)²] | µ = mean(xs)
 */ export declare function variance(...xs: bigint[]): bigint;
/**
 * Find the arithmetic mean of bigints (µ).
 * @param xs bigints
 * @returns µ = (Σxᵢ)/n | n = size(xs)
 */ export declare function arithmeticMean(...xs: bigint[]): bigint;
export { arithmeticMean as mean };
/**
 * Find the geometric mean of bigints.
 * @param xs bigints
 * @returns ⁿ√(∏xᵢ) | n = size(xs)
 */ export declare function geometricMean(...xs: bigint[]): bigint | null;
/**
 * Find the harmonic mean of bigints.
 * @param xs bigints
 * @returns n/Σ(1/xᵢ) | n = size(xs)
 */ export declare function harmonicMean(...xs: bigint[]): bigint;
/**
 * Find the quadriatic mean of bigints.
 * @param xs bigints
 * @returns √(Σxᵢ²)/n | n = size(xs)
 */ export declare function quadriaticMean(...xs: bigint[]): bigint;
export { quadriaticMean as rootMeanSquare };
/**
 * Find the cubic mean of bigints.
 * @param xs bigints
 * @returns ³√(Σxᵢ³)/n | n = size(xs)
 */ export declare function cubicMean(...xs: bigint[]): bigint | null;