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// Type definitions for bignumber.js >=8.1.0
// Project: https://github.com/MikeMcl/bignumber.js
// Definitions by: Michael Mclaughlin <https://github.com/MikeMcl>
// Definitions: https://github.com/MikeMcl/bignumber.js

// Documentation: http://mikemcl.github.io/bignumber.js/
//
// Exports:
//
//   class     BigNumber (default export)
//   type      BigNumber.Constructor
//   type      BigNumber.ModuloMode
//   type      BigNumber.RoundingMOde
//   type      BigNumber.Value
//   interface BigNumber.Config
//   interface BigNumber.Format
//   interface BigNumber.Instance
//
// Example:
//
//   import {BigNumber} from "bignumber.js"
//   //import BigNumber from "bignumber.js"
//
//   let rm: BigNumber.RoundingMode = BigNumber.ROUND_UP;
//   let f: BigNumber.Format = { decimalSeparator: ',' };
//   let c: BigNumber.Config = { DECIMAL_PLACES: 4, ROUNDING_MODE: rm, FORMAT: f };
//   BigNumber.config(c);
//
//   let v: BigNumber.Value = '12345.6789';
//   let b: BigNumber = new BigNumber(v);
//
// The use of compiler option `--strictNullChecks` is recommended.

export default BigNumber;

export namespace BigNumber {

/** See `BigNumber.config` (alias `BigNumber.set`) and `BigNumber.clone`. */
  interface Config {

/**
     * An integer, 0 to 1e+9. Default value: 20.
     *
     * The maximum number of decimal places of the result of operations involving division, i.e.
     * division, square root and base conversion operations, and exponentiation when the exponent is
     * negative.
     *
     * ```ts
     * BigNumber.config({ DECIMAL_PLACES: 5 })
     * BigNumber.set({ DECIMAL_PLACES: 5 })
     * ```
     */
    DECIMAL_PLACES?: number;

/**
     * An integer, 0 to 8. Default value: `BigNumber.ROUND_HALF_UP` (4).
     *
     * The rounding mode used in operations that involve division (see `DECIMAL_PLACES`) and the
     * default rounding mode of the `decimalPlaces`, `precision`, `toExponential`, `toFixed`,
     * `toFormat` and `toPrecision` methods.
     *
     * The modes are available as enumerated properties of the BigNumber constructor.
     *
     * ```ts
     * BigNumber.config({ ROUNDING_MODE: 0 })
     * BigNumber.set({ ROUNDING_MODE: BigNumber.ROUND_UP })
     * ```
     */
    ROUNDING_MODE?: BigNumber.RoundingMode;

/**
     * An integer, 0 to 1e+9, or an array, [-1e+9 to 0, 0 to 1e+9].
     * Default value: `[-7, 20]`.
     *
     * The exponent value(s) at which `toString` returns exponential notation.
     *
     * If a single number is assigned, the value is the exponent magnitude.
     *
     * If an array of two numbers is assigned then the first number is the negative exponent value at
     * and beneath which exponential notation is used, and the second number is the positive exponent
     * value at and above which exponential notation is used.
     *
     * For example, to emulate JavaScript numbers in terms of the exponent values at which they begin
     * to use exponential notation, use `[-7, 20]`.
     *
     * ```ts
     * BigNumber.config({ EXPONENTIAL_AT: 2 })
     * new BigNumber(12.3)         // '12.3'        e is only 1
     * new BigNumber(123)          // '1.23e+2'
     * new BigNumber(0.123)        // '0.123'       e is only -1
     * new BigNumber(0.0123)       // '1.23e-2'
     *
     * BigNumber.config({ EXPONENTIAL_AT: [-7, 20] })
     * new BigNumber(123456789)    // '123456789'   e is only 8
     * new BigNumber(0.000000123)  // '1.23e-7'
     *
     * // Almost never return exponential notation:
     * BigNumber.config({ EXPONENTIAL_AT: 1e+9 })
     *
     * // Always return exponential notation:
     * BigNumber.config({ EXPONENTIAL_AT: 0 })
     * ```
     *
     * Regardless of the value of `EXPONENTIAL_AT`, the `toFixed` method will always return a value in
     * normal notation and the `toExponential` method will always return a value in exponential form.
     * Calling `toString` with a base argument, e.g. `toString(10)`, will also always return normal
     * notation.
     */
    EXPONENTIAL_AT?: number | [number, number];

/**
     * An integer, magnitude 1 to 1e+9, or an array, [-1e+9 to -1, 1 to 1e+9].
     * Default value: `[-1e+9, 1e+9]`.
     *
     * The exponent value(s) beyond which overflow to Infinity and underflow to zero occurs.
     *
     * If a single number is assigned, it is the maximum exponent magnitude: values wth a positive
     * exponent of greater magnitude become Infinity and those with a negative exponent of greater
     * magnitude become zero.
     *
     * If an array of two numbers is assigned then the first number is the negative exponent limit and
     * the second number is the positive exponent limit.
     *
     * For example, to emulate JavaScript numbers in terms of the exponent values at which they
     * become zero and Infinity, use [-324, 308].
     *
     * ```ts
     * BigNumber.config({ RANGE: 500 })
     * BigNumber.config().RANGE     // [ -500, 500 ]
     * new BigNumber('9.999e499')   // '9.999e+499'
     * new BigNumber('1e500')       // 'Infinity'
     * new BigNumber('1e-499')      // '1e-499'
     * new BigNumber('1e-500')      // '0'
     *
     * BigNumber.config({ RANGE: [-3, 4] })
     * new BigNumber(99999)         // '99999'      e is only 4
     * new BigNumber(100000)        // 'Infinity'   e is 5
     * new BigNumber(0.001)         // '0.01'       e is only -3
     * new BigNumber(0.0001)        // '0'          e is -4
     * ```
     * The largest possible magnitude of a finite BigNumber is 9.999...e+1000000000.
     * The smallest possible magnitude of a non-zero BigNumber is 1e-1000000000.
     */
    RANGE?: number | [number, number];

/**
     * A boolean: `true` or `false`. Default value: `false`.
     *
     * The value that determines whether cryptographically-secure pseudo-random number generation is
     * used. If `CRYPTO` is set to true then the random method will generate random digits using
     * `crypto.getRandomValues` in browsers that support it, or `crypto.randomBytes` if using a
     * version of Node.js that supports it.
     *
     * If neither function is supported by the host environment then attempting to set `CRYPTO` to
     * `true` will fail and an exception will be thrown.
     *
     * If `CRYPTO` is `false` then the source of randomness used will be `Math.random` (which is
     * assumed to generate at least 30 bits of randomness).
     *
     * See `BigNumber.random`.
     *
     * ```ts
     * // Node.js
     * global.crypto = require('crypto')
     *
     * BigNumber.config({ CRYPTO: true })
     * BigNumber.config().CRYPTO       // true
     * BigNumber.random()              // 0.54340758610486147524
     * ```
     */
    CRYPTO?: boolean;

/**
     * An integer, 0, 1, 3, 6 or 9. Default value: `BigNumber.ROUND_DOWN` (1).
     *
     * The modulo mode used when calculating the modulus: `a mod n`.
     * The quotient, `q = a / n`, is calculated according to the `ROUNDING_MODE` that corresponds to
     * the chosen `MODULO_MODE`.
     * The remainder, `r`, is calculated as: `r = a - n * q`.
     *
     * The modes that are most commonly used for the modulus/remainder operation are shown in the
     * following table. Although the other rounding modes can be used, they may not give useful
     * results.
     *
     * Property           | Value | Description
     * :------------------|:------|:------------------------------------------------------------------
     *  `ROUND_UP`        |   0   | The remainder is positive if the dividend is negative.
     *  `ROUND_DOWN`      |   1   | The remainder has the same sign as the dividend.
     *                    |       | Uses 'truncating division' and matches JavaScript's `%` operator .
     *  `ROUND_FLOOR`     |   3   | The remainder has the same sign as the divisor.
     *                    |       | This matches Python's `%` operator.
     *  `ROUND_HALF_EVEN` |   6   | The IEEE 754 remainder function.
     *  `EUCLID`          |   9   | The remainder is always positive.
     *                    |       | Euclidian division: `q = sign(n) * floor(a / abs(n))`
     *
     * The rounding/modulo modes are available as enumerated properties of the BigNumber constructor.
     *
     * See `modulo`.
     *
     * ```ts
     * BigNumber.config({ MODULO_MODE: BigNumber.EUCLID })
     * BigNumber.set({ MODULO_MODE: 9 })          // equivalent
     * ```
     */
    MODULO_MODE?: BigNumber.ModuloMode;

/**
     * An integer, 0 to 1e+9. Default value: 0.
     *
     * The maximum precision, i.e. number of significant digits, of the result of the power operation
     * - unless a modulus is specified.
     *
     * If set to 0, the number of significant digits will not be limited.
     *
     * See `exponentiatedBy`.
     *
     * ```ts
     * BigNumber.config({ POW_PRECISION: 100 })
     * ```
     */
    POW_PRECISION?: number;

/**
     * An object including any number of the properties shown below.
     *
     * The object configures the format of the string returned by the `toFormat` method.
     * The example below shows the properties of the object that are recognised, and
     * their default values.
     *
     * Unlike the other configuration properties, the values of the properties of the `FORMAT` object
     * will not be checked for validity - the existing object will simply be replaced by the object
     * that is passed in.
     *
     * See `toFormat`.
     *
     * ```ts
     * BigNumber.config({
     *   FORMAT: {
     *     // string to prepend
     *     prefix: '',
     *     // the decimal separator
     *     decimalSeparator: '.',
     *     // the grouping separator of the integer part
     *     groupSeparator: ',',
     *     // the primary grouping size of the integer part
     *     groupSize: 3,
     *     // the secondary grouping size of the integer part
     *     secondaryGroupSize: 0,
     *     // the grouping separator of the fraction part
     *     fractionGroupSeparator: ' ',
     *     // the grouping size of the fraction part
     *     fractionGroupSize: 0,
     *     // string to append
     *     suffix: ''
     *   }
     * })
     * ```
     */
    FORMAT?: BigNumber.Format;

/**
     * The alphabet used for base conversion. The length of the alphabet corresponds to the maximum
     * value of the base argument that can be passed to the BigNumber constructor or `toString`.
     *
     * Default value: `'0123456789abcdefghijklmnopqrstuvwxyz'`.
     *
     * There is no maximum length for the alphabet, but it must be at least 2 characters long,
     * and it must not contain whitespace or a repeated character, or the sign indicators '+' and
     * '-', or the decimal separator '.'.
     *
     * ```ts
     * // duodecimal (base 12)
     * BigNumber.config({ ALPHABET: '0123456789TE' })
     * x = new BigNumber('T', 12)
     * x.toString()                // '10'
     * x.toString(12)              // 'T'
     * ```
     */
    ALPHABET?: string;
  }

/** See `FORMAT` and `toFormat`. */
  interface Format {

/** The string to prepend. */
    prefix?: string;

/** The decimal separator. */
    decimalSeparator?: string;

/** The grouping separator of the integer part. */
    groupSeparator?: string;

/** The primary grouping size of the integer part. */
    groupSize?: number;

/** The secondary grouping size of the integer part. */
    secondaryGroupSize?: number;

/** The grouping separator of the fraction part. */
    fractionGroupSeparator?: string;

/** The grouping size of the fraction part. */
    fractionGroupSize?: number;

/** The string to append. */
    suffix?: string;
  }

interface Instance {

/** The coefficient of the value of this BigNumber, an array of base 1e14 integer numbers, or null. */
    readonly c: number[] | null;

/** The exponent of the value of this BigNumber, an integer number, -1000000000 to 1000000000, or null. */
    readonly e: number | null;

/** The sign of the value of this BigNumber, -1, 1, or null. */
    readonly s: number | null;

[key: string]: any;
  }

type Constructor = typeof BigNumber;
  type ModuloMode = 0 | 1 | 3 | 6 | 9;
  type RoundingMode = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8;
  type Value = string | number | Instance;
}

export declare class BigNumber implements BigNumber.Instance {

/** Used internally to identify a BigNumber instance. */
  private readonly _isBigNumber: true;

/** The coefficient of the value of this BigNumber, an array of base 1e14 integer numbers, or null. */
  readonly c: number[] | null;

/** The exponent of the value of this BigNumber, an integer number, -1000000000 to 1000000000, or null. */
  readonly e: number | null;

/** The sign of the value of this BigNumber, -1, 1, or null. */
  readonly s: number | null;

/**
   * Returns a new instance of a BigNumber object with value `n`, where `n` is a numeric value in
   * the specified `base`, or base 10 if `base` is omitted or is `null` or `undefined`.
   *
   * ```ts
   * x = new BigNumber(123.4567)              // '123.4567'
   * // 'new' is optional
   * y = BigNumber(x)                         // '123.4567'
   * ```
   *
   * If `n` is a base 10 value it can be in normal (fixed-point) or exponential notation.
   * Values in other bases must be in normal notation. Values in any base can have fraction digits,
   * i.e. digits after the decimal point.
   *
   * ```ts
   * new BigNumber(43210)                     // '43210'
   * new BigNumber('4.321e+4')                // '43210'
   * new BigNumber('-735.0918e-430')          // '-7.350918e-428'
   * new BigNumber('123412421.234324', 5)     // '607236.557696'
   * ```
   *
   * Signed `0`, signed `Infinity` and `NaN` are supported.
   *
   * ```ts
   * new BigNumber('-Infinity')               // '-Infinity'
   * new BigNumber(NaN)                       // 'NaN'
   * new BigNumber(-0)                        // '0'
   * new BigNumber('.5')                      // '0.5'
   * new BigNumber('+2')                      // '2'
   * ```
   *
   * String values in hexadecimal literal form, e.g. `'0xff'`, are valid, as are string values with
   * the octal and binary prefixs `'0o'` and `'0b'`. String values in octal literal form without the
   * prefix will be interpreted as decimals, e.g. `'011'` is interpreted as 11, not 9.
   *
   * ```ts
   * new BigNumber(-10110100.1, 2)            // '-180.5'
   * new BigNumber('-0b10110100.1')           // '-180.5'
   * new BigNumber('ff.8', 16)                // '255.5'
   * new BigNumber('0xff.8')                  // '255.5'
   * ```
   *
   * If a base is specified, `n` is rounded according to the current `DECIMAL_PLACES` and
   * `ROUNDING_MODE` settings. This includes base 10, so don't include a `base` parameter for decimal
   * values unless this behaviour is desired.
   *
   * ```ts
   * BigNumber.config({ DECIMAL_PLACES: 5 })
   * new BigNumber(1.23456789)                // '1.23456789'
   * new BigNumber(1.23456789, 10)            // '1.23457'
   * ```
   *
   * An error is thrown if `base` is invalid.
   *
   * There is no limit to the number of digits of a value of type string (other than that of
   * JavaScript's maximum array size). See `RANGE` to set the maximum and minimum possible exponent
   * value of a BigNumber.
   *
   * ```ts
   * new BigNumber('5032485723458348569331745.33434346346912144534543')
   * new BigNumber('4.321e10000000')
   * ```
   *
   * BigNumber `NaN` is returned if `n` is invalid (unless `BigNumber.DEBUG` is `true`, see below).
   *
   * ```ts
   * new BigNumber('.1*')                    // 'NaN'
   * new BigNumber('blurgh')                 // 'NaN'
   * new BigNumber(9, 2)                     // 'NaN'
   * ```
   *
   * To aid in debugging, if `BigNumber.DEBUG` is `true` then an error will be thrown on an
   * invalid `n`. An error will also be thrown if `n` is of type number with more than 15
   * significant digits, as calling `toString` or `valueOf` on these numbers may not result in the
   * intended value.
   *
   * ```ts
   * console.log(823456789123456.3)          //  823456789123456.2
   * new BigNumber(823456789123456.3)        // '823456789123456.2'
   * BigNumber.DEBUG = true
   * // 'Error: Number has more than 15 significant digits'
   * new BigNumber(823456789123456.3)
   * // 'Error: Not a base 2 number'
   * new BigNumber(9, 2)
   * ```
   *
   * A BigNumber can also be created from an object literal.
   * Use `isBigNumber` to check that it is well-formed.
   *
   * ```ts
   * new BigNumber({ s: 1, e: 2, c: [ 777, 12300000000000 ], _isBigNumber: true })    // '777.123'
   * ```
   *
   * @param n A numeric value.
   * @param base The base of `n`, integer, 2 to 36 (or `ALPHABET.length`, see `ALPHABET`).
   */
  constructor(n: BigNumber.Value, base?: number);

/**
   * Returns a BigNumber whose value is the absolute value, i.e. the magnitude, of the value of this
   * BigNumber.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * x = new BigNumber(-0.8)
   * x.absoluteValue()           // '0.8'
   * ```
   */
  absoluteValue(): BigNumber;

/**
   * Returns a BigNumber whose value is the absolute value, i.e. the magnitude, of the value of this
   * BigNumber.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * x = new BigNumber(-0.8)
   * x.abs()                     // '0.8'
   * ```
   */
  abs(): BigNumber;

/**
   *  Returns |                                                               |
   * :-------:|:--------------------------------------------------------------|
   *     1    | If the value of this BigNumber is greater than the value of `n`
   *    -1    | If the value of this BigNumber is less than the value of `n`
   *     0    | If this BigNumber and `n` have the same value
   *  `null`  | If the value of either this BigNumber or `n` is `NaN`
   *
   * ```ts
   *
   * x = new BigNumber(Infinity)
   * y = new BigNumber(5)
   * x.comparedTo(y)                 // 1
   * x.comparedTo(x.minus(1))        // 0
   * y.comparedTo(NaN)               // null
   * y.comparedTo('110', 2)          // -1
   * ```
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  comparedTo(n: BigNumber.Value, base?: number): number;

/**
   * Returns a BigNumber whose value is the value of this BigNumber rounded by rounding mode
   * `roundingMode` to a maximum of `decimalPlaces` decimal places.
   *
   * If `decimalPlaces` is omitted, or is `null` or `undefined`, the return value is the number of
   * decimal places of the value of this BigNumber, or `null` if the value of this BigNumber is
   * ±`Infinity` or `NaN`.
   *
   * If `roundingMode` is omitted, or is `null` or `undefined`, `ROUNDING_MODE` is used.
   *
   * Throws if `decimalPlaces` or `roundingMode` is invalid.
   *
   * ```ts
   * x = new BigNumber(1234.56)
   * x.decimalPlaces()                      // 2
   * x.decimalPlaces(1)                     // '1234.6'
   * x.decimalPlaces(2)                     // '1234.56'
   * x.decimalPlaces(10)                    // '1234.56'
   * x.decimalPlaces(0, 1)                  // '1234'
   * x.decimalPlaces(0, 6)                  // '1235'
   * x.decimalPlaces(1, 1)                  // '1234.5'
   * x.decimalPlaces(1, BigNumber.ROUND_HALF_EVEN)     // '1234.6'
   * x                                      // '1234.56'
   * y = new BigNumber('9.9e-101')
   * y.decimalPlaces()                      // 102
   * ```
   *
   * @param [decimalPlaces] Decimal places, integer, 0 to 1e+9.
   * @param [roundingMode] Rounding mode, integer, 0 to 8.
   */
  decimalPlaces(): number | null;
  decimalPlaces(decimalPlaces: number, roundingMode?: BigNumber.RoundingMode): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber rounded by rounding mode
   * `roundingMode` to a maximum of `decimalPlaces` decimal places.
   *
   * If `decimalPlaces` is omitted, or is `null` or `undefined`, the return value is the number of
   * decimal places of the value of this BigNumber, or `null` if the value of this BigNumber is
   * ±`Infinity` or `NaN`.
   *
   * If `roundingMode` is omitted, or is `null` or `undefined`, `ROUNDING_MODE` is used.
   *
   * Throws if `decimalPlaces` or `roundingMode` is invalid.
   *
   * ```ts
   * x = new BigNumber(1234.56)
   * x.dp()                                 // 2
   * x.dp(1)                                // '1234.6'
   * x.dp(2)                                // '1234.56'
   * x.dp(10)                               // '1234.56'
   * x.dp(0, 1)                             // '1234'
   * x.dp(0, 6)                             // '1235'
   * x.dp(1, 1)                             // '1234.5'
   * x.dp(1, BigNumber.ROUND_HALF_EVEN)     // '1234.6'
   * x                                      // '1234.56'
   * y = new BigNumber('9.9e-101')
   * y.dp()                                 // 102
   * ```
   *
   * @param [decimalPlaces] Decimal places, integer, 0 to 1e+9.
   * @param [roundingMode] Rounding mode, integer, 0 to 8.
   */
  dp(): number | null;
  dp(decimalPlaces: number, roundingMode?: BigNumber.RoundingMode): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber divided by `n`, rounded
   * according to the current `DECIMAL_PLACES` and `ROUNDING_MODE` settings.
   *
   * ```ts
   * x = new BigNumber(355)
   * y = new BigNumber(113)
   * x.dividedBy(y)                  // '3.14159292035398230088'
   * x.dividedBy(5)                  // '71'
   * x.dividedBy(47, 16)             // '5'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  dividedBy(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber divided by `n`, rounded
   * according to the current `DECIMAL_PLACES` and `ROUNDING_MODE` settings.
   *
   * ```ts
   * x = new BigNumber(355)
   * y = new BigNumber(113)
   * x.div(y)                    // '3.14159292035398230088'
   * x.div(5)                    // '71'
   * x.div(47, 16)               // '5'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  div(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the integer part of dividing the value of this BigNumber by
   * `n`.
   *
   * ```ts
   * x = new BigNumber(5)
   * y = new BigNumber(3)
   * x.dividedToIntegerBy(y)              // '1'
   * x.dividedToIntegerBy(0.7)            // '7'
   * x.dividedToIntegerBy('0.f', 16)      // '5'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  dividedToIntegerBy(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the integer part of dividing the value of this BigNumber by
   * `n`.
   *
   * ```ts
   * x = new BigNumber(5)
   * y = new BigNumber(3)
   * x.idiv(y)                       // '1'
   * x.idiv(0.7)                     // '7'
   * x.idiv('0.f', 16)               // '5'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  idiv(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber exponentiated by `n`, i.e.
   * raised to the power `n`, and optionally modulo a modulus `m`.
   *
   * If `n` is negative the result is rounded according to the current `DECIMAL_PLACES` and
   * `ROUNDING_MODE` settings.
   *
   * As the number of digits of the result of the power operation can grow so large so quickly,
   * e.g. 123.456**10000 has over 50000 digits, the number of significant digits calculated is
   * limited to the value of the `POW_PRECISION` setting (unless a modulus `m` is specified).
   *
   * By default `POW_PRECISION` is set to 0. This means that an unlimited number of significant
   * digits will be calculated, and that the method's performance will decrease dramatically for
   * larger exponents.
   *
   * If `m` is specified and the value of `m`, `n` and this BigNumber are integers and `n` is
   * positive, then a fast modular exponentiation algorithm is used, otherwise the operation will
   * be performed as `x.exponentiatedBy(n).modulo(m)` with a `POW_PRECISION` of 0.
   *
   * Throws if `n` is not an integer.
   *
   * ```ts
   * Math.pow(0.7, 2)                    // 0.48999999999999994
   * x = new BigNumber(0.7)
   * x.exponentiatedBy(2)                // '0.49'
   * BigNumber(3).exponentiatedBy(-2)    // '0.11111111111111111111'
   * ```
   *
   * @param n The exponent, an integer.
   * @param [m] The modulus.
   */
  exponentiatedBy(n: BigNumber.Value, m?: BigNumber.Value): BigNumber;
  exponentiatedBy(n: number, m?: BigNumber.Value): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber exponentiated by `n`, i.e.
   * raised to the power `n`, and optionally modulo a modulus `m`.
   *
   * If `n` is negative the result is rounded according to the current `DECIMAL_PLACES` and
   * `ROUNDING_MODE` settings.
   *
   * As the number of digits of the result of the power operation can grow so large so quickly,
   * e.g. 123.456**10000 has over 50000 digits, the number of significant digits calculated is
   * limited to the value of the `POW_PRECISION` setting (unless a modulus `m` is specified).
   *
   * By default `POW_PRECISION` is set to 0. This means that an unlimited number of significant
   * digits will be calculated, and that the method's performance will decrease dramatically for
   * larger exponents.
   *
   * If `m` is specified and the value of `m`, `n` and this BigNumber are integers and `n` is
   * positive, then a fast modular exponentiation algorithm is used, otherwise the operation will
   * be performed as `x.pow(n).modulo(m)` with a `POW_PRECISION` of 0.
   *
   * Throws if `n` is not an integer.
   *
   * ```ts
   * Math.pow(0.7, 2)                   // 0.48999999999999994
   * x = new BigNumber(0.7)
   * x.pow(2)                           // '0.49'
   * BigNumber(3).pow(-2)               // '0.11111111111111111111'
   * ```
   *
   * @param n The exponent, an integer.
   * @param [m] The modulus.
   */
  pow(n: BigNumber.Value, m?: BigNumber.Value): BigNumber;
  pow(n: number, m?: BigNumber.Value): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber rounded to an integer using
   * rounding mode `rm`.
   *
   * If `rm` is omitted, or is `null` or `undefined`, `ROUNDING_MODE` is used.
   *
   * Throws if `rm` is invalid.
   *
   * ```ts
   * x = new BigNumber(123.456)
   * x.integerValue()                        // '123'
   * x.integerValue(BigNumber.ROUND_CEIL)    // '124'
   * y = new BigNumber(-12.7)
   * y.integerValue()                        // '-13'
   * x.integerValue(BigNumber.ROUND_DOWN)    // '-12'
   * ```
   *
   * @param {BigNumber.RoundingMode} [rm] The roundng mode, an integer, 0 to 8.
   */
  integerValue(rm?: BigNumber.RoundingMode): BigNumber;

/**
   * Returns `true` if the value of this BigNumber is equal to the value of `n`, otherwise returns
   * `false`.
   *
   * As with JavaScript, `NaN` does not equal `NaN`.
   *
   * ```ts
   * 0 === 1e-324                           // true
   * x = new BigNumber(0)
   * x.isEqualTo('1e-324')                  // false
   * BigNumber(-0).isEqualTo(x)             // true  ( -0 === 0 )
   * BigNumber(255).isEqualTo('ff', 16)     // true
   *
   * y = new BigNumber(NaN)
   * y.isEqualTo(NaN)                // false
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  isEqualTo(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is equal to the value of `n`, otherwise returns
   * `false`.
   *
   * As with JavaScript, `NaN` does not equal `NaN`.
   *
   * ```ts
   * 0 === 1e-324                    // true
   * x = new BigNumber(0)
   * x.eq('1e-324')                  // false
   * BigNumber(-0).eq(x)             // true  ( -0 === 0 )
   * BigNumber(255).eq('ff', 16)     // true
   *
   * y = new BigNumber(NaN)
   * y.eq(NaN)                       // false
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  eq(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is a finite number, otherwise returns `false`.
   *
   * The only possible non-finite values of a BigNumber are `NaN`, `Infinity` and `-Infinity`.
   *
   * ```ts
   * x = new BigNumber(1)
   * x.isFinite()                    // true
   * y = new BigNumber(Infinity)
   * y.isFinite()                    // false
   * ```
   */
  isFinite(): boolean;

/**
   * Returns `true` if the value of this BigNumber is greater than the value of `n`, otherwise
   * returns `false`.
   *
   * ```ts
   * 0.1 > (0.3 - 0.2)                             // true
   * x = new BigNumber(0.1)
   * x.isGreaterThan(BigNumber(0.3).minus(0.2))    // false
   * BigNumber(0).isGreaterThan(x)                 // false
   * BigNumber(11, 3).isGreaterThan(11.1, 2)       // true
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  isGreaterThan(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is greater than the value of `n`, otherwise
   * returns `false`.
   *
   * ```ts
   * 0.1 > (0.3 - 0                     // true
   * x = new BigNumber(0.1)
   * x.gt(BigNumber(0.3).minus(0.2))    // false
   * BigNumber(0).gt(x)                 // false
   * BigNumber(11, 3).gt(11.1, 2)       // true
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  gt(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is greater than or equal to the value of `n`,
   * otherwise returns `false`.
   *
   * ```ts
   * (0.3 - 0.2) >= 0.1                                  // false
   * x = new BigNumber(0.3).minus(0.2)
   * x.isGreaterThanOrEqualTo(0.1)                       // true
   * BigNumber(1).isGreaterThanOrEqualTo(x)              // true
   * BigNumber(10, 18).isGreaterThanOrEqualTo('i', 36)   // true
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  isGreaterThanOrEqualTo(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is greater than or equal to the value of `n`,
   * otherwise returns `false`.
   *
   * ```ts
   * (0.3 - 0.2) >= 0.1                    // false
   * x = new BigNumber(0.3).minus(0.2)
   * x.gte(0.1)                            // true
   * BigNumber(1).gte(x)                   // true
   * BigNumber(10, 18).gte('i', 36)        // true
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  gte(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is an integer, otherwise returns `false`.
   *
   * ```ts
   * x = new BigNumber(1)
   * x.isInteger()                   // true
   * y = new BigNumber(123.456)
   * y.isInteger()                   // false
   * ```
   */
  isInteger(): boolean;

/**
   * Returns `true` if the value of this BigNumber is less than the value of `n`, otherwise returns
   * `false`.
   *
   * ```ts
   * (0.3 - 0.2) < 0.1                       // true
   * x = new BigNumber(0.3).minus(0.2)
   * x.isLessThan(0.1)                       // false
   * BigNumber(0).isLessThan(x)              // true
   * BigNumber(11.1, 2).isLessThan(11, 3)    // true
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  isLessThan(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is less than the value of `n`, otherwise returns
   * `false`.
   *
   * ```ts
   * (0.3 - 0.2) < 0.1                       // true
   * x = new BigNumber(0.3).minus(0.2)
   * x.lt(0.1)                               // false
   * BigNumber(0).lt(x)                      // true
   * BigNumber(11.1, 2).lt(11, 3)            // true
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  lt(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is less than or equal to the value of `n`,
   * otherwise returns `false`.
   *
   * ```ts
   * 0.1 <= (0.3 - 0.2)                                 // false
   * x = new BigNumber(0.1)
   * x.isLessThanOrEqualTo(BigNumber(0.3).minus(0.2))   // true
   * BigNumber(-1).isLessThanOrEqualTo(x)               // true
   * BigNumber(10, 18).isLessThanOrEqualTo('i', 36)     // true
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  isLessThanOrEqualTo(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is less than or equal to the value of `n`,
   * otherwise returns `false`.
   *
   * ```ts
   * 0.1 <= (0.3 - 0.2)                  // false
   * x = new BigNumber(0.1)
   * x.lte(BigNumber(0.3).minus(0.2))    // true
   * BigNumber(-1).lte(x)                // true
   * BigNumber(10, 18).lte('i', 36)      // true
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  lte(n: BigNumber.Value, base?: number): boolean;

/**
   * Returns `true` if the value of this BigNumber is `NaN`, otherwise returns `false`.
   *
   * ```ts
   * x = new BigNumber(NaN)
   * x.isNaN()                       // true
   * y = new BigNumber('Infinity')
   * y.isNaN()                       // false
   * ```
   */
  isNaN(): boolean;

/**
   * Returns `true` if the value of this BigNumber is negative, otherwise returns `false`.
   *
   * ```ts
   * x = new BigNumber(-0)
   * x.isNegative()                  // true
   * y = new BigNumber(2)
   * y.isNegative()                  // false
   * ```
   */
  isNegative(): boolean;

/**
   * Returns `true` if the value of this BigNumber is positive, otherwise returns `false`.
   *
   * ```ts
   * x = new BigNumber(-0)
   * x.isPositive()                  // false
   * y = new BigNumber(2)
   * y.isPositive()                  // true
   * ```
   */
  isPositive(): boolean;

/**
   * Returns `true` if the value of this BigNumber is zero or minus zero, otherwise returns `false`.
   *
   * ```ts
   * x = new BigNumber(-0)
   * x.isZero()                 // true
   * ```
   */
  isZero(): boolean;

/**
   * Returns a BigNumber whose value is the value of this BigNumber minus `n`.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * 0.3 - 0.1                       // 0.19999999999999998
   * x = new BigNumber(0.3)
   * x.minus(0.1)                    // '0.2'
   * x.minus(0.6, 20)                // '0'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  minus(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber modulo `n`, i.e. the integer
   * remainder of dividing this BigNumber by `n`.
   *
   * The value returned, and in particular its sign, is dependent on the value of the `MODULO_MODE`
   * setting of this BigNumber constructor. If it is 1 (default value), the result will have the
   * same sign as this BigNumber, and it will match that of Javascript's `%` operator (within the
   * limits of double precision) and BigDecimal's `remainder` method.
   *
   * The return value is always exact and unrounded.
   *
   * See `MODULO_MODE` for a description of the other modulo modes.
   *
   * ```ts
   * 1 % 0.9                         // 0.09999999999999998
   * x = new BigNumber(1)
   * x.modulo(0.9)                   // '0.1'
   * y = new BigNumber(33)
   * y.modulo('a', 33)               // '3'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  modulo(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber modulo `n`, i.e. the integer
   * remainder of dividing this BigNumber by `n`.
   *
   * The value returned, and in particular its sign, is dependent on the value of the `MODULO_MODE`
   * setting of this BigNumber constructor. If it is 1 (default value), the result will have the
   * same sign as this BigNumber, and it will match that of Javascript's `%` operator (within the
   * limits of double precision) and BigDecimal's `remainder` method.
   *
   * The return value is always exact and unrounded.
   *
   * See `MODULO_MODE` for a description of the other modulo modes.
   *
   * ```ts
   * 1 % 0.9                      // 0.09999999999999998
   * x = new BigNumber(1)
   * x.mod(0.9)                   // '0.1'
   * y = new BigNumber(33)
   * y.mod('a', 33)               // '3'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  mod(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber multiplied by `n`.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * 0.6 * 3                                // 1.7999999999999998
   * x = new BigNumber(0.6)
   * y = x.multipliedBy(3)                  // '1.8'
   * BigNumber('7e+500').multipliedBy(y)    // '1.26e+501'
   * x.multipliedBy('-a', 16)               // '-6'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  multipliedBy(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber multiplied by `n`.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * 0.6 * 3                         // 1.7999999999999998
   * x = new BigNumber(0.6)
   * y = x.times(3)                  // '1.8'
   * BigNumber('7e+500').times(y)    // '1.26e+501'
   * x.times('-a', 16)               // '-6'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  times(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber negated, i.e. multiplied by -1.
   *
   * ```ts
   * x = new BigNumber(1.8)
   * x.negated()                     // '-1.8'
   * y = new BigNumber(-1.3)
   * y.negated()                     // '1.3'
   * ```
   */
  negated(): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber plus `n`.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * 0.1 + 0.2                       // 0.30000000000000004
   * x = new BigNumber(0.1)
   * y = x.plus(0.2)                 // '0.3'
   * BigNumber(0.7).plus(x).plus(y)  // '1.1'
   * x.plus('0.1', 8)                // '0.225'
   * ```
   *
   * @param n A numeric value.
   * @param [base] The base of n.
   */
  plus(n: BigNumber.Value, base?: number): BigNumber;

/**
   * Returns the number of significant digits of the value of this BigNumber, or `null` if the value
   * of this BigNumber is ±`Infinity` or `NaN`.
   *
   * If `includeZeros` is true then any trailing zeros of the integer part of the value of this
   * BigNumber are counted as significant digits, otherwise they are not.
   *
   * Throws if `includeZeros` is invalid.
   *
   * ```ts
   * x = new BigNumber(9876.54321)
   * x.precision()                         // 9
   * y = new BigNumber(987000)
   * y.precision(false)                    // 3
   * y.precision(true)                     // 6
   * ```
   *
   * @param [includeZeros] Whether to include integer trailing zeros in the significant digit count.
   */
  precision(includeZeros?: boolean): number;

/**
   * Returns a BigNumber whose value is the value of this BigNumber rounded to a precision of
   * `significantDigits` significant digits using rounding mode `roundingMode`.
   *
   * If `roundingMode` is omitted or is `null` or `undefined`, `ROUNDING_MODE` will be used.
   *
   * Throws if `significantDigits` or `roundingMode` is invalid.
   *
   * ```ts
   * x = new BigNumber(9876.54321)
   * x.precision(6)                         // '9876.54'
   * x.precision(6, BigNumber.ROUND_UP)     // '9876.55'
   * x.precision(2)                         // '9900'
   * x.precision(2, 1)                      // '9800'
   * x                                      // '9876.54321'
   * ```
   *
   * @param significantDigits Significant digits, integer, 1 to 1e+9.
   * @param [roundingMode] Rounding mode, integer, 0 to 8.
   */
  precision(significantDigits: number, roundingMode?: BigNumber.RoundingMode): BigNumber;

/**
   * Returns the number of significant digits of the value of this BigNumber,
   * or `null` if the value of this BigNumber is ±`Infinity` or `NaN`.
   *
   * If `includeZeros` is true then any trailing zeros of the integer part of
   * the value of this BigNumber are counted as significant digits, otherwise
   * they are not.
   *
   * Throws if `includeZeros` is invalid.
   *
   * ```ts
   * x = new BigNumber(9876.54321)
   * x.sd()                         // 9
   * y = new BigNumber(987000)
   * y.sd(false)                    // 3
   * y.sd(true)                     // 6
   * ```
   *
   * @param [includeZeros] Whether to include integer trailing zeros in the significant digit count.
   */
  sd(includeZeros?: boolean): number;

/**
   * Returns a BigNumber whose value is the value of this BigNumber rounded to a precision of
   * `significantDigits` significant digits using rounding mode `roundingMode`.
   *
   * If `roundingMode` is omitted or is `null` or `undefined`, `ROUNDING_MODE` will be used.
   *
   * Throws if `significantDigits` or `roundingMode` is invalid.
   *
   * ```ts
   * x = new BigNumber(9876.54321)
   * x.sd(6)                           // '9876.54'
   * x.sd(6, BigNumber.ROUND_UP)       // '9876.55'
   * x.sd(2)                           // '9900'
   * x.sd(2, 1)                        // '9800'
   * x                                 // '9876.54321'
   * ```
   *
   * @param significantDigits Significant digits, integer, 1 to 1e+9.
   * @param [roundingMode] Rounding mode, integer, 0 to 8.
   */
  sd(significantDigits: number, roundingMode?: BigNumber.RoundingMode): BigNumber;

/**
   * Returns a BigNumber whose value is the value of this BigNumber shifted by `n` places.
   *
   * The shift is of the decimal point, i.e. of powers of ten, and is to the left if `n` is negative
   * or to the right if `n` is positive.
   *
   * The return value is always exact and unrounded.
   *
   * Throws if `n` is invalid.
   *
   * ```ts
   * x = new BigNumber(1.23)
   * x.shiftedBy(3)                      // '1230'
   * x.shiftedBy(-3)                     // '0.00123'
   * ```
   *
   * @param n The shift value, integer, -9007199254740991 to 9007199254740991.
   */
  shiftedBy(n: number): BigNumber;

/**
   * Returns a BigNumber whose value is the square root of the value of this BigNumber, rounded
   * according to the current `DECIMAL_PLACES` and `ROUNDING_MODE` settings.
   *
   * The return value will be correctly rounded, i.e. rounded as if the result was first calculated
   * to an infinite number of correct digits before rounding.
   *
   * ```ts
   * x = new BigNumber(16)
   * x.squareRoot()                  // '4'
   * y = new BigNumber(3)
   * y.squareRoot()                  // '1.73205080756887729353'
   * ```
   */
  squareRoot(): BigNumber;

/**
   * Returns a BigNumber whose value is the square root of the value of this BigNumber, rounded
   * according to the current `DECIMAL_PLACES` and `ROUNDING_MODE` settings.
   *
   * The return value will be correctly rounded, i.e. rounded as if the result was first calculated
   * to an infinite number of correct digits before rounding.
   *
   * ```ts
   * x = new BigNumber(16)
   * x.sqrt()                  // '4'
   * y = new BigNumber(3)
   * y.sqrt()                  // '1.73205080756887729353'
   * ```
   */
  sqrt(): BigNumber;

/**
   * Returns a string representing the value of this BigNumber in exponential notation rounded using
   * rounding mode `roundingMode` to `decimalPlaces` decimal places, i.e with one digit before the
   * decimal point and `decimalPlaces` digits after it.
   *
   * If the value of this BigNumber in exponential notation has fewer than `decimalPlaces` fraction
   * digits, the return value will be appended with zeros accordingly.
   *
   * If `decimalPlaces` is omitted, or is `null` or `undefined`, the number of digits after the
   * decimal point defaults to the minimum number of digits necessary to represent the value
   * exactly.
   *
   * If `roundingMode` is omitted or is `null` or `undefined`, `ROUNDING_MODE` is used.
   *
   * Throws if `decimalPlaces` or `roundingMode` is invalid.
   *
   * ```ts
   * x = 45.6
   * y = new BigNumber(x)
   * x.toExponential()               // '4.56e+1'
   * y.toExponential()               // '4.56e+1'
   * x.toExponential(0)              // '5e+1'
   * y.toExponential(0)              // '5e+1'
   * x.toExponential(1)              // '4.6e+1'
   * y.toExponential(1)              // '4.6e+1'
   * y.toExponential(1, 1)           // '4.5e+1'  (ROUND_DOWN)
   * x.toExponential(3)              // '4.560e+1'
   * y.toExponential(3)              // '4.560e+1'
   * ```
   *
   * @param [decimalPlaces] Decimal places, integer, 0 to 1e+9.
   * @param [roundingMode] Rounding mode, integer, 0 to 8.
   */
  toExponential(decimalPlaces: number, roundingMode?: BigNumber.RoundingMode): string;
  toExponential(): string;

/**
   * Returns a string representing the value of this BigNumber in normal (fixed-point) notation
   * rounded to `decimalPlaces` decimal places using rounding mode `roundingMode`.
   *
   * If the value of this BigNumber in normal notation has fewer than `decimalPlaces` fraction
   * digits, the return value will be appended with zeros accordingly.
   *
   * Unlike `Number.prototype.toFixed`, which returns exponential notation if a number is greater or
   * equal to 10**21, this method will always return normal notation.
   *
   * If `decimalPlaces` is omitted or is `null` or `undefined`, the return value will be unrounded
   * and in normal notation. This is also unlike `Number.prototype.toFixed`, which returns the value
   * to zero decimal places. It is useful when normal notation is required and the current
   * `EXPONENTIAL_AT` setting causes `toString` to return exponential notation.
   *
   * If `roundingMode` is omitted or is `null` or `undefined`, `ROUNDING_MODE` is used.
   *
   * Throws if `decimalPlaces` or `roundingMode` is invalid.
   *
   * ```ts
   * x = 3.456
   * y = new BigNumber(x)
   * x.toFixed()                     // '3'
   * y.toFixed()                     // '3.456'
   * y.toFixed(0)                    // '3'
   * x.toFixed(2)                    // '3.46'
   * y.toFixed(2)                    // '3.46'
   * y.toFixed(2, 1)                 // '3.45'  (ROUND_DOWN)
   * x.toFixed(5)                    // '3.45600'
   * y.toFixed(5)                    // '3.45600'
   * ```
   *
   * @param [decimalPlaces] Decimal places, integer, 0 to 1e+9.
   * @param [roundingMode] Rounding mode, integer, 0 to 8.
   */
  toFixed(decimalPlaces: number, roundingMode?: BigNumber.RoundingMode): string;
  toFixed(): string;

/**
   * Returns a string representing the value of this BigNumber in normal (fixed-point) notation
   * rounded to `decimalPlaces` decimal places using rounding mode `roundingMode`, and formatted
   * according to the properties of the `format` or `FORMAT` object.
   *
   * The formatting object may contain some or all of the properties shown in the examples below.
   *
   * If `decimalPlaces` is omitted or is `null` or `undefined`, then the return value is not
   * rounded to a fixed number of decimal places.
   *
   * If `roundingMode` is omitted or is `null` or `undefined`, `ROUNDING_MODE` is used.
   *
   * If `format` is omitted or is `null` or `undefined`, `FORMAT` is used.
   *
   * Throws if `decimalPlaces`, `roundingMode`, or `format` is invalid.
   *
   * ```ts
   * fmt = {
   *   decimalSeparator: '.',
   *   groupSeparator: ',',
   *   groupSize: 3,
   *   secondaryGroupSize: 0,
   *   fractionGroupSeparator: ' ',
   *   fractionGroupSize: 0
   * }
   *
   * x = new BigNumber('123456789.123456789')
   *
   * // Set the global formatting options
   * BigNumber.config({ FORMAT: fmt })
   *
   * x.toFormat()                              // '123,456,789.123456789'
   * x.toFormat(3)                             // '123,456,789.123'
   *
   * // If a reference to the object assigned to FORMAT has been retained,
   * // the format properties can be changed directly
   * fmt.groupSeparator = ' '
   * fmt.fractionGroupSize = 5
   * x.toFormat()                              // '123 456 789.12345 6789'
   *
   * // Alternatively, pass the formatting options as an argument
   * fmt = {
   *   decimalSeparator: ',',
   *   groupSeparator: '.',
   *   groupSize: 3,
   *   secondaryGroupSize: 2
   * }
   *
   * x.toFormat()                              // '123 456 789.12345 6789'
   * x.toFormat(fmt)                           // '12.34.56.789,123456789'
   * x.toFormat(2, fmt)                        // '12.34.56.789,12'
   * x.toFormat(3, BigNumber.ROUND_UP, fmt)    // '12.34.56.789,124'
   * ```
   *
   * @param [decimalPlaces] Decimal places, integer, 0 to 1e+9.
   * @param [roundingMode] Rounding mode, integer, 0 to 8.
   * @param [format] Formatting options object. See `BigNumber.Format`.
   */
  toFormat(decimalPlaces: number, roundingMode: BigNumber.RoundingMode, format?: BigNumber.Format): string;
  toFormat(decimalPlaces: number, roundingMode?: BigNumber.RoundingMode): string;
  toFormat(decimalPlaces?: number): string;
  toFormat(decimalPlaces: number, format: BigNumber.Format): string;
  toFormat(format: BigNumber.Format): string;

/**
   * Returns an array of two BigNumbers representing the value of this BigNumber as a simple
   * fraction with an integer numerator and an integer denominator.
   * The denominator will be a positive non-zero value less than or equal to `max_denominator`.
   * If a maximum denominator, `max_denominator`, is not specified, or is `null` or `undefined`, the
   * denominator will be the lowest value necessary to represent the number exactly.
   *
   * Throws if `max_denominator` is invalid.
   *
   * ```ts
   * x = new BigNumber(1.75)
   * x.toFraction()                  // '7, 4'
   *
   * pi = new BigNumber('3.14159265358')
   * pi.toFraction()                 // '157079632679,50000000000'
   * pi.toFraction(100000)           // '312689, 99532'
   * pi.toFraction(10000)            // '355, 113'
   * pi.toFraction(100)              // '311, 99'
   * pi.toFraction(10)               // '22, 7'
   * pi.toFraction(1)                // '3, 1'
   * ```
   *
   * @param [max_denominator] The maximum denominator, integer > 0, or Infinity.
   */
  toFraction(max_denominator?: BigNumber.Value): [BigNumber, BigNumber];

/** As `valueOf`. */
  toJSON(): string;

/**
   * Returns the value of this BigNumber as a JavaScript primitive number.
   *
   * Using the unary plus operator gives the same result.
   *
   * ```ts
   * x = new BigNumber(456.789)
   * x.toNumber()                    // 456.789
   * +x                              // 456.789
   *
   * y = new BigNumber('45987349857634085409857349856430985')
   * y.toNumber()                    // 4.598734985763409e+34
   *
   * z = new BigNumber(-0)
   * 1 / z.toNumber()                // -Infinity
   * 1 / +z                          // -Infinity
   * ```
   */
  toNumber(): number;

/**
   * Returns a string representing the value of this BigNumber rounded to `significantDigits`
   * significant digits using rounding mode `roundingMode`.
   *
   * If `significantDigits` is less than the number of digits necessary to represent the integer
   * part of the value in normal (fixed-point) notation, then exponential notation is used.
   *
   * If `significantDigits` is omitted, or is `null` or `undefined`, then the return value is the
   * same as `n.toString()`.
   *
   * If `roundingMode` is omitted or is `null` or `undefined`, `ROUNDING_MODE` is used.
   *
   * Throws if `significantDigits` or `roundingMode` is invalid.
   *
   * ```ts
   * x = 45.6
   * y = new BigNumber(x)
   * x.toPrecision()                 // '45.6'
   * y.toPrecision()                 // '45.6'
   * x.toPrecision(1)                // '5e+1'
   * y.toPrecision(1)                // '5e+1'
   * y.toPrecision(2, 0)             // '4.6e+1'  (ROUND_UP)
   * y.toPrecision(2, 1)             // '4.5e+1'  (ROUND_DOWN)
   * x.toPrecision(5)                // '45.600'
   * y.toPrecision(5)                // '45.600'
   * ```
   *
   * @param [significantDigits] Significant digits, integer, 1 to 1e+9.
   * @param [roundingMode] Rounding mode, integer 0 to 8.
   */
  toPrecision(significantDigits: number, roundingMode?: BigNumber.RoundingMode): string;
  toPrecision(): string;

/**
   * Returns a string representing the value of this BigNumber in base `base`, or base 10 if `base`
   * is omitted or is `null` or `undefined`.
   *
   * For bases above 10, and using the default base conversion alphabet (see `ALPHABET`), values
   * from 10 to 35 are represented by a-z (the same as `Number.prototype.toString`).
   *
   * If a base is specified the value is rounded according to the current `DECIMAL_PLACES` and
   * `ROUNDING_MODE` settings, otherwise it is not.
   *
   * If a base is not specified, and this BigNumber has a positive exponent that is equal to or
   * greater than the positive component of the current `EXPONENTIAL_AT` setting, or a negative
   * exponent equal to or less than the negative component of the setting, then exponential notation
   * is returned.
   *
   * If `base` is `null` or `undefined` it is ignored.
   *
   * Throws if `base` is invalid.
   *
   * ```ts
   * x = new BigNumber(750000)
   * x.toString()                    // '750000'
   * BigNumber.config({ EXPONENTIAL_AT: 5 })
   * x.toString()                    // '7.5e+5'
   *
   * y = new BigNumber(362.875)
   * y.toString(2)                   // '101101010.111'
   * y.toString(9)                   // '442.77777777777777777778'
   * y.toString(32)                  // 'ba.s'
   *
   * BigNumber.config({ DECIMAL_PLACES: 4 });
   * z = new BigNumber('1.23456789')
   * z.toString()                    // '1.23456789'
   * z.toString(10)                  // '1.2346'
   * ```
   *
   * @param [base] The base, integer, 2 to 36 (or `ALPHABET.length`, see `ALPHABET`).
   */
  toString(base?: number): string;

/**
   * As `toString`, but does not accept a base argument and includes the minus sign for negative
   * zero.
   *
   * ``ts
   * x = new BigNumber('-0')
   * x.toString()                    // '0'
   * x.valueOf()                     // '-0'
   * y = new BigNumber('1.777e+457')
   * y.valueOf()                     // '1.777e+457'
   * ```
   */
  valueOf(): string;

/** Helps ES6 import. */
  private static readonly default?: BigNumber.Constructor;

/** Helps ES6 import. */
  private static readonly BigNumber?: BigNumber.Constructor;

/** Rounds away from zero. */
  static readonly ROUND_UP: 0;

/** Rounds towards zero. */
  static readonly ROUND_DOWN: 1;

/** Rounds towards Infinity. */
  static readonly ROUND_CEIL: 2;

/** Rounds towards -Infinity. */
  static readonly ROUND_FLOOR: 3;

/** Rounds towards nearest neighbour. If equidistant, rounds away from zero . */
  static readonly ROUND_HALF_UP: 4;

/** Rounds towards nearest neighbour. If equidistant, rounds towards zero. */
  static readonly ROUND_HALF_DOWN: 5;

/** Rounds towards nearest neighbour. If equidistant, rounds towards even neighbour. */
  static readonly ROUND_HALF_EVEN: 6;

/** Rounds towards nearest neighbour. If equidistant, rounds towards Infinity. */
  static readonly ROUND_HALF_CEIL: 7;

/** Rounds towards nearest neighbour. If equidistant, rounds towards -Infinity. */
  static readonly ROUND_HALF_FLOOR: 8;

/** See `MODULO_MODE`. */
  static readonly EUCLID: 9;

/**
   * To aid in debugging, if a `BigNumber.DEBUG` property is `true` then an error will be thrown
   * if the BigNumber constructor receives an invalid `BigNumber.Value`, or if `BigNumber.isBigNumber`
   * receives a BigNumber instance that is malformed.
   *
   * ```ts
   * // No error, and BigNumber NaN is returned.
   * new BigNumber('blurgh')    // 'NaN'
   * new BigNumber(9, 2)        // 'NaN'
   * BigNumber.DEBUG = true
   * new BigNumber('blurgh')    // '[BigNumber Error] Not a number'
   * new BigNumber(9, 2)        // '[BigNumber Error] Not a base 2 number'
   * ```
   *
   * An error will also be thrown if a `BigNumber.Value` is of type number with more than 15
   * significant digits, as calling `toString` or `valueOf` on such numbers may not result
   * in the intended value.
   *
   * ```ts
   * console.log(823456789123456.3)       //  823456789123456.2
   * // No error, and the returned BigNumber does not have the same value as the number literal.
   * new BigNumber(823456789123456.3)     // '823456789123456.2'
   * BigNumber.DEBUG = true
   * new BigNumber(823456789123456.3)
   * // '[BigNumber Error] Number primitive has more than 15 significant digits'
   * ```
   *
   * Check that a BigNumber instance is well-formed:
   *
   * ```ts
   * x = new BigNumber(10)
   *
   * BigNumber.DEBUG = false
   * // Change x.c to an illegitimate value.
   * x.c = NaN
   * // No error, as BigNumber.DEBUG is false.
   * BigNumber.isBigNumber(x)    // true
   *
   * BigNumber.DEBUG = true
   * BigNumber.isBigNumber(x)    // '[BigNumber Error] Invalid BigNumber'
   * ```
   */
  static DEBUG?: boolean;

/**
   * Returns a new independent BigNumber constructor with configuration as described by `object`, or
   * with the default configuration if object is `null` or `undefined`.
   *
   * Throws if `object` is not an object.
   *
   * ```ts
   * BigNumber.config({ DECIMAL_PLACES: 5 })
   * BN = BigNumber.clone({ DECIMAL_PLACES: 9 })
   *
   * x = new BigNumber(1)
   * y = new BN(1)
   *
   * x.div(3)                        // 0.33333
   * y.div(3)                        // 0.333333333
   *
   * // BN = BigNumber.clone({ DECIMAL_PLACES: 9 }) is equivalent to:
   * BN = BigNumber.clone()
   * BN.config({ DECIMAL_PLACES: 9 })
   * ```
   *
   * @param [object] The configuration object.
   */
  static clone(object?: BigNumber.Config): BigNumber.Constructor;

/**
   * Configures the settings that apply to this BigNumber constructor.
   *
   * The configuration object, `object`, contains any number of the properties shown in the example
   * below.
   *
   * Returns an object with the above properties and their current values.
   *
   * Throws if `object` is not an object, or if an invalid value is assigned to one or more of the
   * properties.
   *
   * ```ts
   * BigNumber.config({
   *     DECIMAL_PLACES: 40,
   *     ROUNDING_MODE: BigNumber.ROUND_HALF_CEIL,
   *     EXPONENTIAL_AT: [-10, 20],
   *     RANGE: [-500, 500],
   *     CRYPTO: true,
   *     MODULO_MODE: BigNumber.ROUND_FLOOR,
   *     POW_PRECISION: 80,
   *     FORMAT: {
   *         groupSize: 3,
   *         groupSeparator: ' ',
   *         decimalSeparator: ','
   *     },
   *     ALPHABET: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_'
   * });
   *
   * BigNumber.config().DECIMAL_PLACES        // 40
   * ```
   *
   * @param object The configuration object.
   */
  static config(object: BigNumber.Config): BigNumber.Config;

/**
   * Returns `true` if `value` is a BigNumber instance, otherwise returns `false`.
   *
   * If `BigNumber.DEBUG` is `true`, throws if a BigNumber instance is not well-formed.
   *
   * ```ts
   * x = 42
   * y = new BigNumber(x)
   *
   * BigNumber.isBigNumber(x)             // false
   * y instanceof BigNumber               // true
   * BigNumber.isBigNumber(y)             // true
   *
   * BN = BigNumber.clone();
   * z = new BN(x)
   * z instanceof BigNumber               // false
   * BigNumber.isBigNumber(z)             // true
   * ```
   *
   * @param value The value to test.
   */
  static isBigNumber(value: any): value is BigNumber;

/**
   * Returns a BigNumber whose value is the maximum of the arguments.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * x = new BigNumber('3257869345.0378653')
   * BigNumber.maximum(4e9, x, '123456789.9')      // '4000000000'
   *
   * arr = [12, '13', new BigNumber(14)]
   * BigNumber.maximum.apply(null, arr)            // '14'
   * ```
   *
   * @param n A numeric value.
   */
  static maximum(...n: BigNumber.Value[]): BigNumber;

/**
   * Returns a BigNumber whose value is the maximum of the arguments.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * x = new BigNumber('3257869345.0378653')
   * BigNumber.max(4e9, x, '123456789.9')      // '4000000000'
   *
   * arr = [12, '13', new BigNumber(14)]
   * BigNumber.max.apply(null, arr)            // '14'
   * ```
   *
   * @param n A numeric value.
   */
  static max(...n: BigNumber.Value[]): BigNumber;

/**
   * Returns a BigNumber whose value is the minimum of the arguments.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * x = new BigNumber('3257869345.0378653')
   * BigNumber.minimum(4e9, x, '123456789.9')          // '123456789.9'
   *
   * arr = [2, new BigNumber(-14), '-15.9999', -12]
   * BigNumber.minimum.apply(null, arr)                // '-15.9999'
   * ```
   *
   * @param n A numeric value.
   */
  static minimum(...n: BigNumber.Value[]): BigNumber;

/**
   * Returns a BigNumber whose value is the minimum of the arguments.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * x = new BigNumber('3257869345.0378653')
   * BigNumber.min(4e9, x, '123456789.9')             // '123456789.9'
   *
   * arr = [2, new BigNumber(-14), '-15.9999', -12]
   * BigNumber.min.apply(null, arr)                   // '-15.9999'
   * ```
   *
   * @param n A numeric value.
   */
  static min(...n: BigNumber.Value[]): BigNumber;

/**
   * Returns a new BigNumber with a pseudo-random value equal to or greater than 0 and less than 1.
   *
   * The return value will have `decimalPlaces` decimal places, or less if trailing zeros are
   * produced. If `decimalPlaces` is omitted, the current `DECIMAL_PLACES` setting will be used.
   *
   * Depending on the value of this BigNumber constructor's `CRYPTO` setting and the support for the
   * `crypto` object in the host environment, the random digits of the return value are generated by
   * either `Math.random` (fastest), `crypto.getRandomValues` (Web Cryptography API in recent
   * browsers) or `crypto.randomBytes` (Node.js).
   *
   * To be able to set `CRYPTO` to true when using Node.js, the `crypto` object must be available
   * globally:
   *
   * ```ts
   * global.crypto = require('crypto')
   * ```
   *
   * If `CRYPTO` is true, i.e. one of the `crypto` methods is to be used, the value of a returned
   * BigNumber should be cryptographically secure and statistically indistinguishable from a random
   * value.
   *
   * Throws if `decimalPlaces` is invalid.
   *
   * ```ts
   * BigNumber.config({ DECIMAL_PLACES: 10 })
   * BigNumber.random()              // '0.4117936847'
   * BigNumber.random(20)            // '0.78193327636914089009'
   * ```
   *
   * @param [decimalPlaces] Decimal places, integer, 0 to 1e+9.
   */
  static random(decimalPlaces?: number): BigNumber;

/**
   * Returns a BigNumber whose value is the sum of the arguments.
   *
   * The return value is always exact and unrounded.
   *
   * ```ts
   * x = new BigNumber('3257869345.0378653')
   * BigNumber.sum(4e9, x, '123456789.9')      // '7381326134.9378653'
   *
   * arr = [2, new BigNumber(14), '15.9999', 12]
   * BigNumber.sum.apply(null, arr)            // '43.9999'
   * ```
   *
   * @param n A numeric value.
   */
  static sum(...n: BigNumber.Value[]): BigNumber;

/**
   * Configures the settings that apply to this BigNumber constructor.
   *
   * The configuration object, `object`, contains any number of the properties shown in the example
   * below.
   *
   * Returns an object with the above properties and their current values.
   *
   * Throws if `object` is not an object, or if an invalid value is assigned to one or more of the
   * properties.
   *
   * ```ts
   * BigNumber.set({
   *     DECIMAL_PLACES: 40,
   *     ROUNDING_MODE: BigNumber.ROUND_HALF_CEIL,
   *     EXPONENTIAL_AT: [-10, 20],
   *     RANGE: [-500, 500],
   *     CRYPTO: true,
   *     MODULO_MODE: BigNumber.ROUND_FLOOR,
   *     POW_PRECISION: 80,
   *     FORMAT: {
   *         groupSize: 3,
   *         groupSeparator: ' ',
   *         decimalSeparator: ','
   *     },
   *     ALPHABET: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_'
   * });
   *
   * BigNumber.set().DECIMAL_PLACES        // 40
   * ```
   *
   * @param object The configuration object.
   */
  static set(object: BigNumber.Config): BigNumber.Config;
}

export function BigNumber(n: BigNumber.Value, base?: number): BigNumber;

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