code:
/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */

'use strict'

var base64 = require('base64-js')
var ieee754 = require('ieee754')
var customInspectSymbol =
  (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation
    ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation
    : null

exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50

var K_MAX_LENGTH = 0x7fffffff
exports.kMaxLength = K_MAX_LENGTH

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Print warning and recommend using `buffer` v4.x which has an Object
 *               implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * We report that the browser does not support typed arrays if the are not subclassable
 * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
 * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
 * for __proto__ and has a buggy typed array implementation.
 */
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
    typeof console.error === 'function') {
  console.error(
    'This browser lacks typed array (Uint8Array) support which is required by ' +
    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
  )
}

function typedArraySupport () {
  // Can typed array instances can be augmented?
  try {
    var arr = new Uint8Array(1)
    var proto = { foo: function () { return 42 } }
    Object.setPrototypeOf(proto, Uint8Array.prototype)
    Object.setPrototypeOf(arr, proto)
    return arr.foo() === 42
  } catch (e) {
    return false
  }
}

Object.defineProperty(Buffer.prototype, 'parent', {
  enumerable: true,
  get: function () {
    if (!Buffer.isBuffer(this)) return undefined
    return this.buffer
  }
})

Object.defineProperty(Buffer.prototype, 'offset', {
  enumerable: true,
  get: function () {
    if (!Buffer.isBuffer(this)) return undefined
    return this.byteOffset
  }
})

function createBuffer (length) {
  if (length > K_MAX_LENGTH) {
    throw new RangeError('The value "' + length + '" is invalid for option "size"')
  }
  // Return an augmented `Uint8Array` instance
  var buf = new Uint8Array(length)
  Object.setPrototypeOf(buf, Buffer.prototype)
  return buf
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

function Buffer (arg, encodingOrOffset, length) {
  // Common case.
  if (typeof arg === 'number') {
    if (typeof encodingOrOffset === 'string') {
      throw new TypeError(
        'The "string" argument must be of type string. Received type number'
      )
    }
    return allocUnsafe(arg)
  }
  return from(arg, encodingOrOffset, length)
}

Buffer.poolSize = 8192 // not used by this implementation

function from (value, encodingOrOffset, length) {
  if (typeof value === 'string') {
    return fromString(value, encodingOrOffset)
  }

  if (ArrayBuffer.isView(value)) {
    return fromArrayView(value)
  }

  if (value == null) {
    throw new TypeError(
      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
      'or Array-like Object. Received type ' + (typeof value)
    )
  }

  if (isInstance(value, ArrayBuffer) ||
      (value && isInstance(value.buffer, ArrayBuffer))) {
    return fromArrayBuffer(value, encodingOrOffset, length)
  }

  if (typeof SharedArrayBuffer !== 'undefined' &&
      (isInstance(value, SharedArrayBuffer) ||
      (value && isInstance(value.buffer, SharedArrayBuffer)))) {
    return fromArrayBuffer(value, encodingOrOffset, length)
  }

  if (typeof value === 'number') {
    throw new TypeError(
      'The "value" argument must not be of type number. Received type number'
    )
  }

  var valueOf = value.valueOf && value.valueOf()
  if (valueOf != null && valueOf !== value) {
    return Buffer.from(valueOf, encodingOrOffset, length)
  }

  var b = fromObject(value)
  if (b) return b

  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
      typeof value[Symbol.toPrimitive] === 'function') {
    return Buffer.from(
      value[Symbol.toPrimitive]('string'), encodingOrOffset, length
    )
  }

  throw new TypeError(
    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
    'or Array-like Object. Received type ' + (typeof value)
  )
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer.from = function (value, encodingOrOffset, length) {
  return from(value, encodingOrOffset, length)
}

// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)
Object.setPrototypeOf(Buffer, Uint8Array)

function assertSize (size) {
  if (typeof size !== 'number') {
    throw new TypeError('"size" argument must be of type number')
  } else if (size < 0) {
    throw new RangeError('The value "' + size + '" is invalid for option "size"')
  }
}

function alloc (size, fill, encoding) {
  assertSize(size)
  if (size <= 0) {
    return createBuffer(size)
  }
  if (fill !== undefined) {
    // Only pay attention to encoding if it's a string. This
    // prevents accidentally sending in a number that would
    // be interpreted as a start offset.
    return typeof encoding === 'string'
      ? createBuffer(size).fill(fill, encoding)
      : createBuffer(size).fill(fill)
  }
  return createBuffer(size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer.alloc = function (size, fill, encoding) {
  return alloc(size, fill, encoding)
}

function allocUnsafe (size) {
  assertSize(size)
  return createBuffer(size < 0 ? 0 : checked(size) | 0)
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer.allocUnsafe = function (size) {
  return allocUnsafe(size)
}
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer.allocUnsafeSlow = function (size) {
  return allocUnsafe(size)
}

function fromString (string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') {
    encoding = 'utf8'
  }

  if (!Buffer.isEncoding(encoding)) {
    throw new TypeError('Unknown encoding: ' + encoding)
  }

  var length = byteLength(string, encoding) | 0
  var buf = createBuffer(length)

  var actual = buf.write(string, encoding)

  if (actual !== length) {
    // Writing a hex string, for example, that contains invalid characters will
    // cause everything after the first invalid character to be ignored. (e.g.
    // 'abxxcd' will be treated as 'ab')
    buf = buf.slice(0, actual)
  }

  return buf
}

function fromArrayLike (array) {
  var length = array.length < 0 ? 0 : checked(array.length) | 0
  var buf = createBuffer(length)
  for (var i = 0; i < length; i += 1) {
    buf[i] = array[i] & 255
  }
  return buf
}

function fromArrayView (arrayView) {
  if (isInstance(arrayView, Uint8Array)) {
    var copy = new Uint8Array(arrayView)
    return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)
  }
  return fromArrayLike(arrayView)
}

function fromArrayBuffer (array, byteOffset, length) {
  if (byteOffset < 0 || array.byteLength < byteOffset) {
    throw new RangeError('"offset" is outside of buffer bounds')
  }

  if (array.byteLength < byteOffset + (length || 0)) {
    throw new RangeError('"length" is outside of buffer bounds')
  }

  var buf
  if (byteOffset === undefined && length === undefined) {
    buf = new Uint8Array(array)
  } else if (length === undefined) {
    buf = new Uint8Array(array, byteOffset)
  } else {
    buf = new Uint8Array(array, byteOffset, length)
  }

  // Return an augmented `Uint8Array` instance
  Object.setPrototypeOf(buf, Buffer.prototype)

  return buf
}

function fromObject (obj) {
  if (Buffer.isBuffer(obj)) {
    var len = checked(obj.length) | 0
    var buf = createBuffer(len)

    if (buf.length === 0) {
      return buf
    }

    obj.copy(buf, 0, 0, len)
    return buf
  }

  if (obj.length !== undefined) {
    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
      return createBuffer(0)
    }
    return fromArrayLike(obj)
  }

  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
    return fromArrayLike(obj.data)
  }
}

function checked (length) {
  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= K_MAX_LENGTH) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
  }
  return length | 0
}

function SlowBuffer (length) {
  if (+length != length) { // eslint-disable-line eqeqeq
    length = 0
  }
  return Buffer.alloc(+length)
}

Buffer.isBuffer = function isBuffer (b) {
  return b != null && b._isBuffer === true &&
    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
}

Buffer.compare = function compare (a, b) {
  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
    throw new TypeError(
      'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
    )
  }

  if (a === b) return 0

  var x = a.length
  var y = b.length

  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
    if (a[i] !== b[i]) {
      x = a[i]
      y = b[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

Buffer.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'latin1':
    case 'binary':
    case 'base64':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
}

Buffer.concat = function concat (list, length) {
  if (!Array.isArray(list)) {
    throw new TypeError('"list" argument must be an Array of Buffers')
  }

  if (list.length === 0) {
    return Buffer.alloc(0)
  }

  var i
  if (length === undefined) {
    length = 0
    for (i = 0; i < list.length; ++i) {
      length += list[i].length
    }
  }

  var buffer = Buffer.allocUnsafe(length)
  var pos = 0
  for (i = 0; i < list.length; ++i) {
    var buf = list[i]
    if (isInstance(buf, Uint8Array)) {
      if (pos + buf.length > buffer.length) {
        Buffer.from(buf).copy(buffer, pos)
      } else {
        Uint8Array.prototype.set.call(
          buffer,
          buf,
          pos
        )
      }
    } else if (!Buffer.isBuffer(buf)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    } else {
      buf.copy(buffer, pos)
    }
    pos += buf.length
  }
  return buffer
}

function byteLength (string, encoding) {
  if (Buffer.isBuffer(string)) {
    return string.length
  }
  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
    return string.byteLength
  }
  if (typeof string !== 'string') {
    throw new TypeError(
      'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
      'Received type ' + typeof string
    )
  }

  var len = string.length
  var mustMatch = (arguments.length > 2 && arguments[2] === true)
  if (!mustMatch && len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'latin1':
      case 'binary':
        return len
      case 'utf8':
      case 'utf-8':
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) {
          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
        }
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}
Buffer.byteLength = byteLength

function slowToString (encoding, start, end) {
  var loweredCase = false

  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
  // property of a typed array.

  // This behaves neither like String nor Uint8Array in that we set start/end
  // to their upper/lower bounds if the value passed is out of range.
  // undefined is handled specially as per ECMA-262 6th Edition,
  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
  if (start === undefined || start < 0) {
    start = 0
  }
  // Return early if start > this.length. Done here to prevent potential uint32
  // coercion fail below.
  if (start > this.length) {
    return ''
  }

  if (end === undefined || end > this.length) {
    end = this.length
  }

  if (end <= 0) {
    return ''
  }

  // Force coercion to uint32. This will also coerce falsey/NaN values to 0.
  end >>>= 0
  start >>>= 0

  if (end <= start) {
    return ''
  }

  if (!encoding) encoding = 'utf8'

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'latin1':
      case 'binary':
        return latin1Slice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase()
        loweredCase = true
    }
  }
}

// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
Buffer.prototype._isBuffer = true

function swap (b, n, m) {
  var i = b[n]
  b[n] = b[m]
  b[m] = i
}

Buffer.prototype.swap16 = function swap16 () {
  var len = this.length
  if (len % 2 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 16-bits')
  }
  for (var i = 0; i < len; i += 2) {
    swap(this, i, i + 1)
  }
  return this
}

Buffer.prototype.swap32 = function swap32 () {
  var len = this.length
  if (len % 4 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 32-bits')
  }
  for (var i = 0; i < len; i += 4) {
    swap(this, i, i + 3)
    swap(this, i + 1, i + 2)
  }
  return this
}

Buffer.prototype.swap64 = function swap64 () {
  var len = this.length
  if (len % 8 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 64-bits')
  }
  for (var i = 0; i < len; i += 8) {
    swap(this, i, i + 7)
    swap(this, i + 1, i + 6)
    swap(this, i + 2, i + 5)
    swap(this, i + 3, i + 4)
  }
  return this
}

Buffer.prototype.toString = function toString () {
  var length = this.length
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
}

Buffer.prototype.toLocaleString = Buffer.prototype.toString

Buffer.prototype.equals = function equals (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect () {
  var str = ''
  var max = exports.INSPECT_MAX_BYTES
  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
  if (this.length > max) str += ' ... '
  return '<Buffer ' + str + '>'
}
if (customInspectSymbol) {
  Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect
}

Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
  if (isInstance(target, Uint8Array)) {
    target = Buffer.from(target, target.offset, target.byteLength)
  }
  if (!Buffer.isBuffer(target)) {
    throw new TypeError(
      'The "target" argument must be one of type Buffer or Uint8Array. ' +
      'Received type ' + (typeof target)
    )
  }

  if (start === undefined) {
    start = 0
  }
  if (end === undefined) {
    end = target ? target.length : 0
  }
  if (thisStart === undefined) {
    thisStart = 0
  }
  if (thisEnd === undefined) {
    thisEnd = this.length
  }

  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
    throw new RangeError('out of range index')
  }

  if (thisStart >= thisEnd && start >= end) {
    return 0
  }
  if (thisStart >= thisEnd) {
    return -1
  }
  if (start >= end) {
    return 1
  }

  start >>>= 0
  end >>>= 0
  thisStart >>>= 0
  thisEnd >>>= 0

  if (this === target) return 0

  var x = thisEnd - thisStart
  var y = end - start
  var len = Math.min(x, y)

  var thisCopy = this.slice(thisStart, thisEnd)
  var targetCopy = target.slice(start, end)

  for (var i = 0; i < len; ++i) {
    if (thisCopy[i] !== targetCopy[i]) {
      x = thisCopy[i]
      y = targetCopy[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
  // Empty buffer means no match
  if (buffer.length === 0) return -1

  // Normalize byteOffset
  if (typeof byteOffset === 'string') {
    encoding = byteOffset
    byteOffset = 0
  } else if (byteOffset > 0x7fffffff) {
    byteOffset = 0x7fffffff
  } else if (byteOffset < -0x80000000) {
    byteOffset = -0x80000000
  }
  byteOffset = +byteOffset // Coerce to Number.
  if (numberIsNaN(byteOffset)) {
    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
    byteOffset = dir ? 0 : (buffer.length - 1)
  }

  // Normalize byteOffset: negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
  if (byteOffset >= buffer.length) {
    if (dir) return -1
    else byteOffset = buffer.length - 1
  } else if (byteOffset < 0) {
    if (dir) byteOffset = 0
    else return -1
  }

  // Normalize val
  if (typeof val === 'string') {
    val = Buffer.from(val, encoding)
  }

  // Finally, search either indexOf (if dir is true) or lastIndexOf
  if (Buffer.isBuffer(val)) {
    // Special case: looking for empty string/buffer always fails
    if (val.length === 0) {
      return -1
    }
    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
  } else if (typeof val === 'number') {
    val = val & 0xFF // Search for a byte value [0-255]
    if (typeof Uint8Array.prototype.indexOf === 'function') {
      if (dir) {
        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
      } else {
        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
      }
    }
    return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)
  }

  throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
  var indexSize = 1
  var arrLength = arr.length
  var valLength = val.length

  if (encoding !== undefined) {
    encoding = String(encoding).toLowerCase()
    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
        encoding === 'utf16le' || encoding === 'utf-16le') {
      if (arr.length < 2 || val.length < 2) {
        return -1
      }
      indexSize = 2
      arrLength /= 2
      valLength /= 2
      byteOffset /= 2
    }
  }

  function read (buf, i) {
    if (indexSize === 1) {
      return buf[i]
    } else {
      return buf.readUInt16BE(i * indexSize)
    }
  }

  var i
  if (dir) {
    var foundIndex = -1
    for (i = byteOffset; i < arrLength; i++) {
      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
        if (foundIndex === -1) foundIndex = i
        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
      } else {
        if (foundIndex !== -1) i -= i - foundIndex
        foundIndex = -1
      }
    }
  } else {
    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
    for (i = byteOffset; i >= 0; i--) {
      var found = true
      for (var j = 0; j < valLength; j++) {
        if (read(arr, i + j) !== read(val, j)) {
          found = false
          break
        }
      }
      if (found) return i
    }
  }

  return -1
}

Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
  return this.indexOf(val, byteOffset, encoding) !== -1
}

Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
}

Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
}

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0
  var remaining = buf.length - offset
  if (!length) {
    length = remaining
  } else {
    length = Number(length)
    if (length > remaining) {
      length = remaining
    }
  }

  var strLen = string.length

  if (length > strLen / 2) {
    length = strLen / 2
  }
  for (var i = 0; i < length; ++i) {
    var parsed = parseInt(string.substr(i * 2, 2), 16)
    if (numberIsNaN(parsed)) return i
    buf[offset + i] = parsed
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
  return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function base64Write (buf, string, offset, length) {
  return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8'
    length = this.length
    offset = 0
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset
    length = this.length
    offset = 0
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset >>> 0
    if (isFinite(length)) {
      length = length >>> 0
      if (encoding === undefined) encoding = 'utf8'
    } else {
      encoding = length
      length = undefined
    }
  } else {
    throw new Error(
      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
    )
  }

  var remaining = this.length - offset
  if (length === undefined || length > remaining) length = remaining

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('Attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8'

  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
      case 'latin1':
      case 'binary':
        return asciiWrite(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}

Buffer.prototype.toJSON = function toJSON () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
}

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return base64.fromByteArray(buf)
  } else {
    return base64.fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  end = Math.min(buf.length, end)
  var res = []

  var i = start
  while (i < end) {
    var firstByte = buf[i]
    var codePoint = null
    var bytesPerSequence = (firstByte > 0xEF)
      ? 4
      : (firstByte > 0xDF)
          ? 3
          : (firstByte > 0xBF)
              ? 2
              : 1

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte
          }
          break
        case 2:
          secondByte = buf[i + 1]
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint
            }
          }
          break
        case 3:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint
            }
          }
          break
        case 4:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          fourthByte = buf[i + 3]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD
      bytesPerSequence = 1
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000
      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
      codePoint = 0xDC00 | codePoint & 0x3FF
    }

    res.push(codePoint)
    i += bytesPerSequence
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = ''
  var i = 0
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    )
  }
  return res
}

function asciiSlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i] & 0x7F)
  }
  return ret
}

function latin1Slice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i])
  }
  return ret
}

function hexSlice (buf, start, end) {
  var len = buf.length

  if (!start || start < 0) start = 0
  if (!end || end < 0 || end > len) end = len

  var out = ''
  for (var i = start; i < end; ++i) {
    out += hexSliceLookupTable[buf[i]]
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end)
  var res = ''
  // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)
  for (var i = 0; i < bytes.length - 1; i += 2) {
    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
  }
  return res
}

Buffer.prototype.slice = function slice (start, end) {
  var len = this.length
  start = ~~start
  end = end === undefined ? len : ~~end

  if (start < 0) {
    start += len
    if (start < 0) start = 0
  } else if (start > len) {
    start = len
  }

  if (end < 0) {
    end += len
    if (end < 0) end = 0
  } else if (end > len) {
    end = len
  }

  if (end < start) end = start

  var newBuf = this.subarray(start, end)
  // Return an augmented `Uint8Array` instance
  Object.setPrototypeOf(newBuf, Buffer.prototype)

  return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUintLE =
Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }

  return val
}

Buffer.prototype.readUintBE =
Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length)
  }

  var val = this[offset + --byteLength]
  var mul = 1
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul
  }

  return val
}

Buffer.prototype.readUint8 =
Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 1, this.length)
  return this[offset]
}

Buffer.prototype.readUint16LE =
Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  return this[offset] | (this[offset + 1] << 8)
}

Buffer.prototype.readUint16BE =
Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  return (this[offset] << 8) | this[offset + 1]
}

Buffer.prototype.readUint32LE =
Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
}

Buffer.prototype.readUint32BE =
Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
}

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var i = byteLength
  var mul = 1
  var val = this[offset + --i]
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 1, this.length)
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset] | (this[offset + 1] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset + 1] | (this[offset] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, false, 52, 8)
}

function checkInt (buf, value, offset, ext, max, min) {
  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUintLE =
Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var mul = 1
  var i = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUintBE =
Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var i = byteLength - 1
  var mul = 1
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUint8 =
Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeUint16LE =
Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  return offset + 2
}

Buffer.prototype.writeUint16BE =
Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  this[offset] = (value >>> 8)
  this[offset + 1] = (value & 0xff)
  return offset + 2
}

Buffer.prototype.writeUint32LE =
Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  this[offset + 3] = (value >>> 24)
  this[offset + 2] = (value >>> 16)
  this[offset + 1] = (value >>> 8)
  this[offset] = (value & 0xff)
  return offset + 4
}

Buffer.prototype.writeUint32BE =
Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  this[offset] = (value >>> 24)
  this[offset + 1] = (value >>> 16)
  this[offset + 2] = (value >>> 8)
  this[offset + 3] = (value & 0xff)
  return offset + 4
}

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    var limit = Math.pow(2, (8 * byteLength) - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = 0
  var mul = 1
  var sub = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    var limit = Math.pow(2, (8 * byteLength) - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = byteLength - 1
  var mul = 1
  var sub = 0
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
  if (value < 0) value = 0xff + value + 1
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  this[offset] = (value >>> 8)
  this[offset + 1] = (value & 0xff)
  return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  this[offset + 2] = (value >>> 16)
  this[offset + 3] = (value >>> 24)
  return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (value < 0) value = 0xffffffff + value + 1
  this[offset] = (value >>> 24)
  this[offset + 1] = (value >>> 16)
  this[offset + 2] = (value >>> 8)
  this[offset + 3] = (value & 0xff)
  return offset + 4
}

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
  if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
  }
  ieee754.write(buf, value, offset, littleEndian, 23, 4)
  return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
  }
  ieee754.write(buf, value, offset, littleEndian, 52, 8)
  return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
  if (!start) start = 0
  if (!end && end !== 0) end = this.length
  if (targetStart >= target.length) targetStart = target.length
  if (!targetStart) targetStart = 0
  if (end > 0 && end < start) end = start

  // Copy 0 bytes; we're done
  if (end === start) return 0
  if (target.length === 0 || this.length === 0) return 0

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length) end = this.length
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start
  }

  var len = end - start

  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
    // Use built-in when available, missing from IE11
    this.copyWithin(targetStart, start, end)
  } else {
    Uint8Array.prototype.set.call(
      target,
      this.subarray(start, end),
      targetStart
    )
  }

  return len
}

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill (val, start, end, encoding) {
  // Handle string cases:
  if (typeof val === 'string') {
    if (typeof start === 'string') {
      encoding = start
      start = 0
      end = this.length
    } else if (typeof end === 'string') {
      encoding = end
      end = this.length
    }
    if (encoding !== undefined && typeof encoding !== 'string') {
      throw new TypeError('encoding must be a string')
    }
    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
      throw new TypeError('Unknown encoding: ' + encoding)
    }
    if (val.length === 1) {
      var code = val.charCodeAt(0)
      if ((encoding === 'utf8' && code < 128) ||
          encoding === 'latin1') {
        // Fast path: If `val` fits into a single byte, use that numeric value.
        val = code
      }
    }
  } else if (typeof val === 'number') {
    val = val & 255
  } else if (typeof val === 'boolean') {
    val = Number(val)
  }

  // Invalid ranges are not set to a default, so can range check early.
  if (start < 0 || this.length < start || this.length < end) {
    throw new RangeError('Out of range index')
  }

  if (end <= start) {
    return this
  }

  start = start >>> 0
  end = end === undefined ? this.length : end >>> 0

  if (!val) val = 0

  var i
  if (typeof val === 'number') {
    for (i = start; i < end; ++i) {
      this[i] = val
    }
  } else {
    var bytes = Buffer.isBuffer(val)
      ? val
      : Buffer.from(val, encoding)
    var len = bytes.length
    if (len === 0) {
      throw new TypeError('The value "' + val +
        '" is invalid for argument "value"')
    }
    for (i = 0; i < end - start; ++i) {
      this[i + start] = bytes[i % len]
    }
  }

  return this
}

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

function base64clean (str) {
  // Node takes equal signs as end of the Base64 encoding
  str = str.split('=')[0]
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = str.trim().replace(INVALID_BASE64_RE, '')
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '='
  }
  return str
}

function utf8ToBytes (string, units) {
  units = units || Infinity
  var codePoint
  var length = string.length
  var leadSurrogate = null
  var bytes = []

  for (var i = 0; i < length; ++i) {
    codePoint = string.charCodeAt(i)

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        }

        // valid lead
        leadSurrogate = codePoint

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        leadSurrogate = codePoint
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
    }

    leadSurrogate = null

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint)
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = []
  for (var i = 0; i < str.length; ++i) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF)
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo
  var byteArray = []
  for (var i = 0; i < str.length; ++i) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i)
    hi = c >> 8
    lo = c % 256
    byteArray.push(lo)
    byteArray.push(hi)
  }

  return byteArray
}

function base64ToBytes (str) {
  return base64.toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; ++i) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i]
  }
  return i
}

// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
// the `instanceof` check but they should be treated as of that type.
// See: https://github.com/feross/buffer/issues/166
function isInstance (obj, type) {
  return obj instanceof type ||
    (obj != null && obj.constructor != null && obj.constructor.name != null &&
      obj.constructor.name === type.name)
}
function numberIsNaN (obj) {
  // For IE11 support
  return obj !== obj // eslint-disable-line no-self-compare
}

// Create lookup table for `toString('hex')`
// See: https://github.com/feross/buffer/issues/219
var hexSliceLookupTable = (function () {
  var alphabet = '0123456789abcdef'
  var table = new Array(256)
  for (var i = 0; i < 16; ++i) {
    var i16 = i * 16
    for (var j = 0; j < 16; ++j) {
      table[i16 + j] = alphabet[i] + alphabet[j]
    }
  }
  return table
})()


buffer

description: Node.js Buffer API, for the browser

contributors:
Romain Beauxis <toots@rastageeks.org>
James Halliday <mail@substack.net>

keywords: arraybuffer browser browserify buffer compatible dataview uint8array

license: MIT

type: git

perf: browserify --debug perf/bracket-notation.js > perf/bundle.js && open perf/index.html

perf-node: node perf/bracket-notation.js && node perf/concat.js && node perf/copy-big.js && node perf/copy.js && node perf/new-big.js && node perf/new.js && node perf/readDoubleBE.js && node perf/readFloatBE.js && node perf/readUInt32LE.js && node perf/slice.js && node perf/writeFloatBE.js

size: browserify -r ./ | uglifyjs -c -m | gzip | wc -c

test: standard && node ./bin/test.js

test-browser-es5: airtap -- test/*.js

test-browser-es5-local: airtap --local -- test/*.js

test-browser-es6: airtap -- test/*.js test/node/*.js

test-browser-es6-local: airtap --local -- test/*.js test/node/*.js

test-node: tape test/*.js test/node/*.js

type: github

type: patreon

type: consulting

license: mit


code:
3.0.0 / 2017-08-31
==================

  * Change "kB" to "KB" in format output
  * Remove support for Node.js 0.6
  * Remove support for ComponentJS

2.5.0 / 2017-03-24
==================

  * Add option "unit"

2.4.0 / 2016-06-01
==================

  * Add option "unitSeparator"

2.3.0 / 2016-02-15
==================

  * Drop partial bytes on all parsed units
  * Fix non-finite numbers to `.format` to return `null`
  * Fix parsing byte string that looks like hex
  * perf: hoist regular expressions

2.2.0 / 2015-11-13
==================

  * add option "decimalPlaces"
  * add option "fixedDecimals"

2.1.0 / 2015-05-21
==================

  * add `.format` export
  * add `.parse` export

2.0.2 / 2015-05-20
==================

  * remove map recreation
  * remove unnecessary object construction

2.0.1 / 2015-05-07
==================

  * fix browserify require
  * remove node.extend dependency

2.0.0 / 2015-04-12
==================

  * add option "case"
  * add option "thousandsSeparator"
  * return "null" on invalid parse input
  * support proper round-trip: bytes(bytes(num)) === num
  * units no longer case sensitive when parsing

1.0.0 / 2014-05-05
==================

 * add negative support. fixes #6

0.3.0 / 2014-03-19
==================

 * added terabyte support

0.2.1 / 2013-04-01
==================

  * add .component

0.2.0 / 2012-10-28
==================

  * bytes(200).should.eql('200b')

0.1.0 / 2012-07-04
==================

  * add bytes to string conversion [yields]


code:
# Bytes utility

[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Build Status][travis-image]][travis-url]
[![Test Coverage][coveralls-image]][coveralls-url]

Utility to parse a string bytes (ex: `1TB`) to bytes (`1099511627776`) and vice-versa.

## Installation

This is a [Node.js](https://nodejs.org/en/) module available through the
[npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):

```bash
$ npm install bytes
```

## Usage

```js
var bytes = require('bytes');
```

#### bytes.format(number value, [options]): string｜null

Format the given value in bytes into a string. If the value is negative, it is kept as such. If it is a float, it is
 rounded.

**Arguments**

| Name    | Type     | Description        |
|---------|----------|--------------------|
| value   | `number` | Value in bytes     |
| options | `Object` | Conversion options |

**Options**

| Property          | Type   | Description                                                                             |
|-------------------|--------|-----------------------------------------------------------------------------------------|
| decimalPlaces | `number`｜`null` | Maximum number of decimal places to include in output. Default value to `2`. |
| fixedDecimals | `boolean`｜`null` | Whether to always display the maximum number of decimal places. Default value to `false` |
| thousandsSeparator | `string`｜`null` | Example of values: `' '`, `','` and `.`... Default value to `''`. |
| unit | `string`｜`null` | The unit in which the result will be returned (B/KB/MB/GB/TB). Default value to `''` (which means auto detect). |
| unitSeparator | `string`｜`null` | Separator to use between number and unit. Default value to `''`. |

**Returns**

| Name    | Type             | Description                                     |
|---------|------------------|-------------------------------------------------|
| results | `string`｜`null` | Return null upon error. String value otherwise. |

**Example**

```js
bytes(1024);
// output: '1KB'

bytes(1000);
// output: '1000B'

bytes(1000, {thousandsSeparator: ' '});
// output: '1 000B'

bytes(1024 * 1.7, {decimalPlaces: 0});
// output: '2KB'

bytes(1024, {unitSeparator: ' '});
// output: '1 KB'

```

#### bytes.parse(string｜number value): number｜null

Parse the string value into an integer in bytes. If no unit is given, or `value`
is a number, it is assumed the value is in bytes.

Supported units and abbreviations are as follows and are case-insensitive:

  * `b` for bytes
  * `kb` for kilobytes
  * `mb` for megabytes
  * `gb` for gigabytes
  * `tb` for terabytes

The units are in powers of two, not ten. This means 1kb = 1024b according to this parser.

**Arguments**

| Name          | Type   | Description        |
|---------------|--------|--------------------|
| value   | `string`｜`number` | String to parse, or number in bytes.   |

**Returns**

| Name    | Type        | Description             |
|---------|-------------|-------------------------|
| results | `number`｜`null` | Return null upon error. Value in bytes otherwise. |

**Example**

```js
bytes('1KB');
// output: 1024

bytes('1024');
// output: 1024

bytes(1024);
// output: 1024
```

## License

[MIT](LICENSE)

[downloads-image]: https://img.shields.io/npm/dm/bytes.svg
[downloads-url]: https://npmjs.org/package/bytes
[npm-image]: https://img.shields.io/npm/v/bytes.svg
[npm-url]: https://npmjs.org/package/bytes
[travis-image]: https://img.shields.io/travis/visionmedia/bytes.js/master.svg
[travis-url]: https://travis-ci.org/visionmedia/bytes.js
[coveralls-image]: https://img.shields.io/coveralls/visionmedia/bytes.js/master.svg
[coveralls-url]: https://coveralls.io/r/visionmedia/bytes.js?branch=master


code:
/*!
 * bytes
 * Copyright(c) 2012-2014 TJ Holowaychuk
 * Copyright(c) 2015 Jed Watson
 * MIT Licensed
 */

'use strict';

/**
 * Module exports.
 * @public
 */

module.exports = bytes;
module.exports.format = format;
module.exports.parse = parse;

/**
 * Module variables.
 * @private
 */

var formatThousandsRegExp = /\B(?=(\d{3})+(?!\d))/g;

var formatDecimalsRegExp = /(?:\.0*|(\.[^0]+)0+)$/;

var map = {
  b:  1,
  kb: 1 << 10,
  mb: 1 << 20,
  gb: 1 << 30,
  tb: ((1 << 30) * 1024)
};

var parseRegExp = /^((-|\+)?(\d+(?:\.\d+)?)) *(kb|mb|gb|tb)$/i;

/**
 * Convert the given value in bytes into a string or parse to string to an integer in bytes.
 *
 * @param {string|number} value
 * @param {{
 *  case: [string],
 *  decimalPlaces: [number]
 *  fixedDecimals: [boolean]
 *  thousandsSeparator: [string]
 *  unitSeparator: [string]
 *  }} [options] bytes options.
 *
 * @returns {string|number|null}
 */

function bytes(value, options) {
  if (typeof value === 'string') {
    return parse(value);
  }

  if (typeof value === 'number') {
    return format(value, options);
  }

  return null;
}

/**
 * Format the given value in bytes into a string.
 *
 * If the value is negative, it is kept as such. If it is a float,
 * it is rounded.
 *
 * @param {number} value
 * @param {object} [options]
 * @param {number} [options.decimalPlaces=2]
 * @param {number} [options.fixedDecimals=false]
 * @param {string} [options.thousandsSeparator=]
 * @param {string} [options.unit=]
 * @param {string} [options.unitSeparator=]
 *
 * @returns {string|null}
 * @public
 */

function format(value, options) {
  if (!Number.isFinite(value)) {
    return null;
  }

  var mag = Math.abs(value);
  var thousandsSeparator = (options && options.thousandsSeparator) || '';
  var unitSeparator = (options && options.unitSeparator) || '';
  var decimalPlaces = (options && options.decimalPlaces !== undefined) ? options.decimalPlaces : 2;
  var fixedDecimals = Boolean(options && options.fixedDecimals);
  var unit = (options && options.unit) || '';

  if (!unit || !map[unit.toLowerCase()]) {
    if (mag >= map.tb) {
      unit = 'TB';
    } else if (mag >= map.gb) {
      unit = 'GB';
    } else if (mag >= map.mb) {
      unit = 'MB';
    } else if (mag >= map.kb) {
      unit = 'KB';
    } else {
      unit = 'B';
    }
  }

  var val = value / map[unit.toLowerCase()];
  var str = val.toFixed(decimalPlaces);

  if (!fixedDecimals) {
    str = str.replace(formatDecimalsRegExp, '$1');
  }

  if (thousandsSeparator) {
    str = str.replace(formatThousandsRegExp, thousandsSeparator);
  }

  return str + unitSeparator + unit;
}

/**
 * Parse the string value into an integer in bytes.
 *
 * If no unit is given, it is assumed the value is in bytes.
 *
 * @param {number|string} val
 *
 * @returns {number|null}
 * @public
 */

function parse(val) {
  if (typeof val === 'number' && !isNaN(val)) {
    return val;
  }

  if (typeof val !== 'string') {
    return null;
  }

  // Test if the string passed is valid
  var results = parseRegExp.exec(val);
  var floatValue;
  var unit = 'b';

  if (!results) {
    // Nothing could be extracted from the given string
    floatValue = parseInt(val, 10);
    unit = 'b'
  } else {
    // Retrieve the value and the unit
    floatValue = parseFloat(results[1]);
    unit = results[4].toLowerCase();
  }

  return Math.floor(map[unit] * floatValue);
}


bytes

description: Utility to parse a string bytes to bytes and vice-versa

author: TJ Holowaychuk <tj@vision-media.ca> (http://tjholowaychuk.com)

contributors:
Jed Watson <jed.watson@me.com>
Théo FIDRY <theo.fidry@gmail.com>

keywords: byte bytes utility parse parser convert converter

test: mocha --check-leaks --reporter spec

test-ci: nyc --reporter=text npm test

test-cov: nyc --reporter=html --reporter=text npm test


code:
{
	"root": true,

	"extends": "@ljharb",

	"rules": {
		"func-name-matching": 0,
		"id-length": 0,
		"new-cap": [2, {
			"capIsNewExceptions": [
				"GetIntrinsic",
			],
		}],
		"no-magic-numbers": 0,
	},
}


code:
# These are supported funding model platforms

github: [ljharb]
patreon: # Replace with a single Patreon username
open_collective: # Replace with a single Open Collective username
ko_fi: # Replace with a single Ko-fi username
tidelift: npm/call-bind
community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
liberapay: # Replace with a single Liberapay username
issuehunt: # Replace with a single IssueHunt username
otechie: # Replace with a single Otechie username
custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']


reporter: text-summary text html json

exclude: coverage test


code:
# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [v1.0.7](https://github.com/ljharb/call-bind/compare/v1.0.6...v1.0.7) - 2024-02-12

### Commits

- [Refactor] use `es-define-property` [`09b76a0`](https://github.com/ljharb/call-bind/commit/09b76a01634440461d44a80c9924ec4b500f3b03)
- [Deps] update `get-intrinsic`, `set-function-length` [`ad5136d`](https://github.com/ljharb/call-bind/commit/ad5136ddda2a45c590959829ad3dce0c9f4e3590)

## [v1.0.6](https://github.com/ljharb/call-bind/compare/v1.0.5...v1.0.6) - 2024-02-05

### Commits

- [Dev Deps] update `aud`, `npmignore`, `tape` [`d564d5c`](https://github.com/ljharb/call-bind/commit/d564d5ce3e06a19df4d499c77f8d1a9da44e77aa)
- [Deps] update `get-intrinsic`, `set-function-length` [`cfc2bdc`](https://github.com/ljharb/call-bind/commit/cfc2bdca7b633df0e0e689e6b637f668f1c6792e)
- [Refactor] use `es-errors`, so things that only need those do not need `get-intrinsic` [`64cd289`](https://github.com/ljharb/call-bind/commit/64cd289ae5862c250a4ca80aa8d461047c166af5)
- [meta] add missing `engines.node` [`32a4038`](https://github.com/ljharb/call-bind/commit/32a4038857b62179f7f9b7b3df2c5260036be582)

## [v1.0.5](https://github.com/ljharb/call-bind/compare/v1.0.4...v1.0.5) - 2023-10-19

### Commits

- [Fix] throw an error on non-functions as early as possible [`f262408`](https://github.com/ljharb/call-bind/commit/f262408f822c840fbc268080f3ad7c429611066d)
- [Deps] update `set-function-length` [`3fff271`](https://github.com/ljharb/call-bind/commit/3fff27145a1e3a76a5b74f1d7c3c43d0fa3b9871)

## [v1.0.4](https://github.com/ljharb/call-bind/compare/v1.0.3...v1.0.4) - 2023-10-19

## [v1.0.3](https://github.com/ljharb/call-bind/compare/v1.0.2...v1.0.3) - 2023-10-19

### Commits

- [actions] reuse common workflows [`a994df6`](https://github.com/ljharb/call-bind/commit/a994df69f401f4bf735a4ccd77029b85d1549453)
- [meta] use `npmignore` to autogenerate an npmignore file [`eef3ef2`](https://github.com/ljharb/call-bind/commit/eef3ef21e1f002790837fedb8af2679c761fbdf5)
- [readme] flesh out content [`1845ccf`](https://github.com/ljharb/call-bind/commit/1845ccfd9976a607884cfc7157c93192cc16cf22)
- [actions] use `node/install` instead of `node/run`; use `codecov` action [`5b47d53`](https://github.com/ljharb/call-bind/commit/5b47d53d2fd74af5ea0a44f1d51e503cd42f7a90)
- [Refactor] use `set-function-length` [`a0e165c`](https://github.com/ljharb/call-bind/commit/a0e165c5dc61db781cbc919b586b1c2b8da0b150)
- [Dev Deps] update `@ljharb/eslint-config`, `aud`, `tape` [`9c50103`](https://github.com/ljharb/call-bind/commit/9c50103f44137279a817317cf6cc421a658f85b4)
- [meta] simplify "exports" [`019c6d0`](https://github.com/ljharb/call-bind/commit/019c6d06b0e1246ceed8e579f57e44441cbbf6d9)
- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `auto-changelog`, `safe-publish-latest`, `tape` [`23bd718`](https://github.com/ljharb/call-bind/commit/23bd718a288d3b03042062b4ef5153b3cea83f11)
- [actions] update codecov uploader [`62552d7`](https://github.com/ljharb/call-bind/commit/62552d79cc79e05825e99aaba134ae5b37f33da5)
- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `auto-changelog`, `tape` [`ec81665`](https://github.com/ljharb/call-bind/commit/ec81665b300f87eabff597afdc8b8092adfa7afd)
- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `safe-publish-latest`, `tape` [`35d67fc`](https://github.com/ljharb/call-bind/commit/35d67fcea883e686650f736f61da5ddca2592de8)
- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `tape` [`0266d8d`](https://github.com/ljharb/call-bind/commit/0266d8d2a45086a922db366d0c2932fa463662ff)
- [Dev Deps] update `@ljharb/eslint-config`, `aud`, `tape` [`43a5b28`](https://github.com/ljharb/call-bind/commit/43a5b28a444e710e1bbf92adb8afb5cf7523a223)
- [Deps] update `define-data-property`, `function-bind`, `get-intrinsic` [`780eb36`](https://github.com/ljharb/call-bind/commit/780eb36552514f8cc99c70821ce698697c2726a5)
- [Dev Deps] update `aud`, `tape` [`90d50ad`](https://github.com/ljharb/call-bind/commit/90d50ad03b061e0268b3380b0065fcaec183dc05)
- [meta] use `prepublishOnly` script for npm 7+ [`44c5433`](https://github.com/ljharb/call-bind/commit/44c5433b7980e02b4870007046407cf6fc543329)
- [Deps] update `get-intrinsic` [`86bfbfc`](https://github.com/ljharb/call-bind/commit/86bfbfcf34afdc6eabc93ce3d408548d0e27d958)
- [Deps] update `get-intrinsic` [`5c53354`](https://github.com/ljharb/call-bind/commit/5c5335489be0294c18cd7a8bb6e08226ee019ff5)
- [actions] update checkout action [`4c393a8`](https://github.com/ljharb/call-bind/commit/4c393a8173b3c8e5b30d5b3297b3b94d48bf87f3)
- [Deps] update `get-intrinsic` [`4e70bde`](https://github.com/ljharb/call-bind/commit/4e70bdec0626acb11616d66250fc14565e716e91)
- [Deps] update `get-intrinsic` [`55ae803`](https://github.com/ljharb/call-bind/commit/55ae803a920bd93c369cd798c20de31f91e9fc60)

## [v1.0.2](https://github.com/ljharb/call-bind/compare/v1.0.1...v1.0.2) - 2021-01-11

### Commits

- [Fix] properly include the receiver in the bound length [`dbae7bc`](https://github.com/ljharb/call-bind/commit/dbae7bc676c079a0d33c0a43e9ef92cb7b01345d)

## [v1.0.1](https://github.com/ljharb/call-bind/compare/v1.0.0...v1.0.1) - 2021-01-08

### Commits

- [Tests] migrate tests to Github Actions [`b6db284`](https://github.com/ljharb/call-bind/commit/b6db284c36f8ccd195b88a6764fe84b7223a0da1)
- [meta] do not publish github action workflow files [`ec7fe46`](https://github.com/ljharb/call-bind/commit/ec7fe46e60cfa4764ee943d2755f5e5a366e578e)
- [Fix] preserve original function’s length when possible [`adbceaa`](https://github.com/ljharb/call-bind/commit/adbceaa3cac4b41ea78bb19d7ccdbaaf7e0bdadb)
- [Tests] gather coverage data on every job [`d69e23c`](https://github.com/ljharb/call-bind/commit/d69e23cc65f101ba1d4c19bb07fa8eb0ec624be8)
- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `tape` [`2fd3586`](https://github.com/ljharb/call-bind/commit/2fd3586c5d47b335364c14293114c6b625ae1f71)
- [Deps] update `get-intrinsic` [`f23e931`](https://github.com/ljharb/call-bind/commit/f23e9318cc271c2add8bb38cfded85ee7baf8eee)
- [Deps] update `get-intrinsic` [`72d9f44`](https://github.com/ljharb/call-bind/commit/72d9f44e184465ba8dd3fb48260bbcff234985f2)
- [meta] fix FUNDING.yml [`e723573`](https://github.com/ljharb/call-bind/commit/e723573438c5a68dcec31fb5d96ea6b7e4a93be8)
- [eslint] ignore coverage output [`15e76d2`](https://github.com/ljharb/call-bind/commit/15e76d28a5f43e504696401e5b31ebb78ee1b532)
- [meta] add Automatic Rebase and Require Allow Edits workflows [`8fa4dab`](https://github.com/ljharb/call-bind/commit/8fa4dabb23ba3dd7bb92c9571c1241c08b56e4b6)

## v1.0.0 - 2020-10-30

### Commits

- Initial commit [`306cf98`](https://github.com/ljharb/call-bind/commit/306cf98c7ec9e7ef66b653ec152277ac1381eb50)
- Tests [`e10d0bb`](https://github.com/ljharb/call-bind/commit/e10d0bbdadc7a10ecedc9a1c035112d3e368b8df)
- Implementation [`43852ed`](https://github.com/ljharb/call-bind/commit/43852eda0f187327b7fad2423ca972149a52bd65)
- npm init [`408f860`](https://github.com/ljharb/call-bind/commit/408f860b773a2f610805fd3613d0d71bac1b6249)
- [meta] add Automatic Rebase and Require Allow Edits workflows [`fb349b2`](https://github.com/ljharb/call-bind/commit/fb349b2e48defbec8b5ec8a8395cc8f69f220b13)
- [meta] add `auto-changelog` [`c4001fc`](https://github.com/ljharb/call-bind/commit/c4001fc43031799ef908211c98d3b0fb2b60fde4)
- [meta] add "funding"; create `FUNDING.yml` [`d4d6d29`](https://github.com/ljharb/call-bind/commit/d4d6d2974a14bc2e98830468eda7fe6d6a776717)
- [Tests] add `npm run lint` [`dedfb98`](https://github.com/ljharb/call-bind/commit/dedfb98bd0ecefb08ddb9a94061bd10cde4332af)
- Only apps should have lockfiles [`54ac776`](https://github.com/ljharb/call-bind/commit/54ac77653db45a7361dc153d2f478e743f110650)
- [meta] add `safe-publish-latest` [`9ea8e43`](https://github.com/ljharb/call-bind/commit/9ea8e435b950ce9b705559cd651039f9bf40140f)


code:
# call-bind <sup>[![Version Badge][npm-version-svg]][package-url]</sup>

[![github actions][actions-image]][actions-url]
[![coverage][codecov-image]][codecov-url]
[![dependency status][deps-svg]][deps-url]
[![dev dependency status][dev-deps-svg]][dev-deps-url]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]

[![npm badge][npm-badge-png]][package-url]

Robustly `.call.bind()` a function.

## Getting started

```sh
npm install --save call-bind
```

## Usage/Examples

```js
const assert = require('assert');
const callBind = require('call-bind');
const callBound = require('call-bind/callBound');

function f(a, b) {
	assert.equal(this, 1);
	assert.equal(a, 2);
	assert.equal(b, 3);
	assert.equal(arguments.length, 2);
}

const fBound = callBind(f);

const slice = callBound('Array.prototype.slice');

delete Function.prototype.call;
delete Function.prototype.bind;

fBound(1, 2, 3);

assert.deepEqual(slice([1, 2, 3, 4], 1, -1), [2, 3]);
```

## Tests

Clone the repo, `npm install`, and run `npm test`

[package-url]: https://npmjs.org/package/call-bind
[npm-version-svg]: https://versionbadg.es/ljharb/call-bind.svg
[deps-svg]: https://david-dm.org/ljharb/call-bind.svg
[deps-url]: https://david-dm.org/ljharb/call-bind
[dev-deps-svg]: https://david-dm.org/ljharb/call-bind/dev-status.svg
[dev-deps-url]: https://david-dm.org/ljharb/call-bind#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/call-bind.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/call-bind.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/call-bind.svg
[downloads-url]: https://npm-stat.com/charts.html?package=call-bind
[codecov-image]: https://codecov.io/gh/ljharb/call-bind/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/ljharb/call-bind/
[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/call-bind
[actions-url]: https://github.com/ljharb/call-bind/actions


code:
'use strict';

var GetIntrinsic = require('get-intrinsic');

var callBind = require('./');

var $indexOf = callBind(GetIntrinsic('String.prototype.indexOf'));

module.exports = function callBoundIntrinsic(name, allowMissing) {
	var intrinsic = GetIntrinsic(name, !!allowMissing);
	if (typeof intrinsic === 'function' && $indexOf(name, '.prototype.') > -1) {
		return callBind(intrinsic);
	}
	return intrinsic;
};


code:
'use strict';

var bind = require('function-bind');
var GetIntrinsic = require('get-intrinsic');
var setFunctionLength = require('set-function-length');

var $TypeError = require('es-errors/type');
var $apply = GetIntrinsic('%Function.prototype.apply%');
var $call = GetIntrinsic('%Function.prototype.call%');
var $reflectApply = GetIntrinsic('%Reflect.apply%', true) || bind.call($call, $apply);

var $defineProperty = require('es-define-property');
var $max = GetIntrinsic('%Math.max%');

module.exports = function callBind(originalFunction) {
	if (typeof originalFunction !== 'function') {
		throw new $TypeError('a function is required');
	}
	var func = $reflectApply(bind, $call, arguments);
	return setFunctionLength(
		func,
		1 + $max(0, originalFunction.length - (arguments.length - 1)),
		true
	);
};

var applyBind = function applyBind() {
	return $reflectApply(bind, $apply, arguments);
};

if ($defineProperty) {
	$defineProperty(module.exports, 'apply', { value: applyBind });
} else {
	module.exports.apply = applyBind;
}


call-bind

description: Robustly `.call.bind()` a function

prepack: npmignore --auto --commentLines=auto

prepublish: not-in-publish || npm run prepublishOnly

prepublishOnly: safe-publish-latest

lint: eslint --ext=.js,.mjs .

postlint: evalmd README.md

pretest: npm run lint

tests-only: nyc tape 'test/**/*.js'

test: npm run tests-only

posttest: aud --production

version: auto-changelog && git add CHANGELOG.md

postversion: auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f "v$(node -e "console.log(require('./package.json').version)")"

keywords: javascript ecmascript es js callbind callbound call bind bound call-bind call-bound function es-abstract

author: Jordan Harband <ljharb@gmail.com>

output: CHANGELOG.md

template: keepachangelog


code:
'use strict';

var test = require('tape');

var callBound = require('../callBound');

test('callBound', function (t) {
	// static primitive
	t.equal(callBound('Array.length'), Array.length, 'Array.length yields itself');
	t.equal(callBound('%Array.length%'), Array.length, '%Array.length% yields itself');

	// static non-function object
	t.equal(callBound('Array.prototype'), Array.prototype, 'Array.prototype yields itself');
	t.equal(callBound('%Array.prototype%'), Array.prototype, '%Array.prototype% yields itself');
	t.equal(callBound('Array.constructor'), Array.constructor, 'Array.constructor yields itself');
	t.equal(callBound('%Array.constructor%'), Array.constructor, '%Array.constructor% yields itself');

	// static function
	t.equal(callBound('Date.parse'), Date.parse, 'Date.parse yields itself');
	t.equal(callBound('%Date.parse%'), Date.parse, '%Date.parse% yields itself');

	// prototype primitive
	t.equal(callBound('Error.prototype.message'), Error.prototype.message, 'Error.prototype.message yields itself');
	t.equal(callBound('%Error.prototype.message%'), Error.prototype.message, '%Error.prototype.message% yields itself');

	// prototype function
	t.notEqual(callBound('Object.prototype.toString'), Object.prototype.toString, 'Object.prototype.toString does not yield itself');
	t.notEqual(callBound('%Object.prototype.toString%'), Object.prototype.toString, '%Object.prototype.toString% does not yield itself');
	t.equal(callBound('Object.prototype.toString')(true), Object.prototype.toString.call(true), 'call-bound Object.prototype.toString calls into the original');
	t.equal(callBound('%Object.prototype.toString%')(true), Object.prototype.toString.call(true), 'call-bound %Object.prototype.toString% calls into the original');

	t['throws'](
		function () { callBound('does not exist'); },
		SyntaxError,
		'nonexistent intrinsic throws'
	);
	t['throws'](
		function () { callBound('does not exist', true); },
		SyntaxError,
		'allowMissing arg still throws for unknown intrinsic'
	);

	t.test('real but absent intrinsic', { skip: typeof WeakRef !== 'undefined' }, function (st) {
		st['throws'](
			function () { callBound('WeakRef'); },
			TypeError,
			'real but absent intrinsic throws'
		);
		st.equal(callBound('WeakRef', true), undefined, 'allowMissing arg avoids exception');
		st.end();
	});

	t.end();
});


code:
'use strict';

var callBind = require('../');
var bind = require('function-bind');
var gOPD = require('gopd');
var hasStrictMode = require('has-strict-mode')();
var forEach = require('for-each');
var inspect = require('object-inspect');
var v = require('es-value-fixtures');

var test = require('tape');

/*
 * older engines have length nonconfigurable
 * in io.js v3, it is configurable except on bound functions, hence the .bind()
 */
var functionsHaveConfigurableLengths = !!(
	gOPD
	&& Object.getOwnPropertyDescriptor
	&& Object.getOwnPropertyDescriptor(bind.call(function () {}), 'length').configurable
);

test('callBind', function (t) {
	forEach(v.nonFunctions, function (nonFunction) {
		t['throws'](
			function () { callBind(nonFunction); },
			TypeError,
			inspect(nonFunction) + ' is not a function'
		);
	});

	var sentinel = { sentinel: true };
	var func = function (a, b) {
		// eslint-disable-next-line no-invalid-this
		return [!hasStrictMode && this === global ? undefined : this, a, b];
	};
	t.equal(func.length, 2, 'original function length is 2');
	t.deepEqual(func(), [undefined, undefined, undefined], 'unbound func with too few args');
	t.deepEqual(func(1, 2), [undefined, 1, 2], 'unbound func with right args');
	t.deepEqual(func(1, 2, 3), [undefined, 1, 2], 'unbound func with too many args');

	var bound = callBind(func);
	t.equal(bound.length, func.length + 1, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
	t.deepEqual(bound(), [undefined, undefined, undefined], 'bound func with too few args');
	t.deepEqual(bound(1, 2), [hasStrictMode ? 1 : Object(1), 2, undefined], 'bound func with right args');
	t.deepEqual(bound(1, 2, 3), [hasStrictMode ? 1 : Object(1), 2, 3], 'bound func with too many args');

	var boundR = callBind(func, sentinel);
	t.equal(boundR.length, func.length, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
	t.deepEqual(boundR(), [sentinel, undefined, undefined], 'bound func with receiver, with too few args');
	t.deepEqual(boundR(1, 2), [sentinel, 1, 2], 'bound func with receiver, with right args');
	t.deepEqual(boundR(1, 2, 3), [sentinel, 1, 2], 'bound func with receiver, with too many args');

	var boundArg = callBind(func, sentinel, 1);
	t.equal(boundArg.length, func.length - 1, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
	t.deepEqual(boundArg(), [sentinel, 1, undefined], 'bound func with receiver and arg, with too few args');
	t.deepEqual(boundArg(2), [sentinel, 1, 2], 'bound func with receiver and arg, with right arg');
	t.deepEqual(boundArg(2, 3), [sentinel, 1, 2], 'bound func with receiver and arg, with too many args');

	t.test('callBind.apply', function (st) {
		var aBound = callBind.apply(func);
		st.deepEqual(aBound(sentinel), [sentinel, undefined, undefined], 'apply-bound func with no args');
		st.deepEqual(aBound(sentinel, [1], 4), [sentinel, 1, undefined], 'apply-bound func with too few args');
		st.deepEqual(aBound(sentinel, [1, 2], 4), [sentinel, 1, 2], 'apply-bound func with right args');

		var aBoundArg = callBind.apply(func);
		st.deepEqual(aBoundArg(sentinel, [1, 2, 3], 4), [sentinel, 1, 2], 'apply-bound func with too many args');
		st.deepEqual(aBoundArg(sentinel, [1, 2], 4), [sentinel, 1, 2], 'apply-bound func with right args');
		st.deepEqual(aBoundArg(sentinel, [1], 4), [sentinel, 1, undefined], 'apply-bound func with too few args');

		var aBoundR = callBind.apply(func, sentinel);
		st.deepEqual(aBoundR([1, 2, 3], 4), [sentinel, 1, 2], 'apply-bound func with receiver and too many args');
		st.deepEqual(aBoundR([1, 2], 4), [sentinel, 1, 2], 'apply-bound func with receiver and right args');
		st.deepEqual(aBoundR([1], 4), [sentinel, 1, undefined], 'apply-bound func with receiver and too few args');

		st.end();
	});

	t.end();
});


code:
declare namespace callsites {
	interface CallSite {
		/**
		Returns the value of `this`.
		*/
		getThis(): unknown | undefined;

		/**
		Returns the type of `this` as a string. This is the name of the function stored in the constructor field of `this`, if available, otherwise the object's `[[Class]]` internal property.
		*/
		getTypeName(): string | null;

		/**
		Returns the current function.
		*/
		getFunction(): Function | undefined;

		/**
		Returns the name of the current function, typically its `name` property. If a name property is not available an attempt will be made to try to infer a name from the function's context.
		*/
		getFunctionName(): string | null;

		/**
		Returns the name of the property of `this` or one of its prototypes that holds the current function.
		*/
		getMethodName(): string | undefined;

		/**
		Returns the name of the script if this function was defined in a script.
		*/
		getFileName(): string | null;

		/**
		Returns the current line number if this function was defined in a script.
		*/
		getLineNumber(): number | null;

		/**
		Returns the current column number if this function was defined in a script.
		*/
		getColumnNumber(): number | null;

		/**
		Returns a string representing the location where `eval` was called if this function was created using a call to `eval`.
		*/
		getEvalOrigin(): string | undefined;

		/**
		Returns `true` if this is a top-level invocation, that is, if it's a global object.
		*/
		isToplevel(): boolean;

		/**
		Returns `true` if this call takes place in code defined by a call to `eval`.
		*/
		isEval(): boolean;

		/**
		Returns `true` if this call is in native V8 code.
		*/
		isNative(): boolean;

		/**
		Returns `true` if this is a constructor call.
		*/
		isConstructor(): boolean;
	}
}

declare const callsites: {
	/**
	Get callsites from the V8 stack trace API.

	@returns An array of `CallSite` objects.

	@example
	```
	import callsites = require('callsites');

	function unicorn() {
		console.log(callsites()[0].getFileName());
		//=> '/Users/sindresorhus/dev/callsites/test.js'
	}

	unicorn();
	```
	*/
	(): callsites.CallSite[];

	// TODO: Remove this for the next major release, refactor the whole definition to:
	// declare function callsites(): callsites.CallSite[];
	// export = callsites;
	default: typeof callsites;
};

export = callsites;


code:
'use strict';

const callsites = () => {
	const _prepareStackTrace = Error.prepareStackTrace;
	Error.prepareStackTrace = (_, stack) => stack;
	const stack = new Error().stack.slice(1);
	Error.prepareStackTrace = _prepareStackTrace;
	return stack;
};

module.exports = callsites;
// TODO: Remove this for the next major release
module.exports.default = callsites;


callsites

description: Get callsites from the V8 stack trace API

repository: sindresorhus/callsites

test: xo && ava && tsd

keywords: stacktrace v8 callsite callsites stack trace function file line debug


code:
# callsites [![Build Status](https://travis-ci.org/sindresorhus/callsites.svg?branch=master)](https://travis-ci.org/sindresorhus/callsites)

> Get callsites from the [V8 stack trace API](https://v8.dev/docs/stack-trace-api)

## Install

```
$ npm install callsites
```

## Usage

```js
const callsites = require('callsites');

function unicorn() {
	console.log(callsites()[0].getFileName());
	//=> '/Users/sindresorhus/dev/callsites/test.js'
}

unicorn();
```

## API

Returns an array of callsite objects with the following methods:

- `getThis`: returns the value of `this`.
- `getTypeName`: returns the type of `this` as a string. This is the name of the function stored in the constructor field of `this`, if available, otherwise the object's `[[Class]]` internal property.
- `getFunction`: returns the current function.
- `getFunctionName`: returns the name of the current function, typically its `name` property. If a name property is not available an attempt will be made to try to infer a name from the function's context.
- `getMethodName`: returns the name of the property of `this` or one of its prototypes that holds the current function.
- `getFileName`: if this function was defined in a script returns the name of the script.
- `getLineNumber`: if this function was defined in a script returns the current line number.
- `getColumnNumber`: if this function was defined in a script returns the current column number
- `getEvalOrigin`: if this function was created using a call to `eval` returns a string representing the location where `eval` was called.
- `isToplevel`: is this a top-level invocation, that is, is this the global object?
- `isEval`: does this call take place in code defined by a call to `eval`?
- `isNative`: is this call in native V8 code?
- `isConstructor`: is this a constructor call?

## License

MIT © [Sindre Sorhus](https://sindresorhus.com)


code:
# Camel Case

[![NPM version][npm-image]][npm-url]
[![NPM downloads][downloads-image]][downloads-url]
[![Bundle size][bundlephobia-image]][bundlephobia-url]

> Transform into a string with the separator denoted by the next word capitalized.

## Installation

```
npm install camel-case --save
```

## Usage

```js
import { camelCase } from "camel-case";

camelCase("string"); //=> "string"
camelCase("dot.case"); //=> "dotCase"
camelCase("PascalCase"); //=> "pascalCase"
camelCase("version 1.2.10"); //=> "version_1_2_10"
```

The function also accepts [`options`](https://github.com/blakeembrey/change-case#options).

### Merge Numbers

If you'd like to remove the behavior prefixing `_` before numbers, you can use `camelCaseTransformMerge`:

```js
import { camelCaseTransformMerge } from "camel-case";

camelCase("version 12", { transform: camelCaseTransformMerge }); //=> "version12"
```

## License

MIT

[npm-image]: https://img.shields.io/npm/v/camel-case.svg?style=flat
[npm-url]: https://npmjs.org/package/camel-case
[downloads-image]: https://img.shields.io/npm/dm/camel-case.svg?style=flat
[downloads-url]: https://npmjs.org/package/camel-case
[bundlephobia-image]: https://img.shields.io/bundlephobia/minzip/camel-case.svg
[bundlephobia-url]: https://bundlephobia.com/result?p=camel-case


code:
import { Options } from "pascal-case";
export { Options };
export declare function camelCaseTransform(input: string, index: number): string;
export declare function camelCaseTransformMerge(input: string, index: number): string;
export declare function camelCase(input: string, options?: Options): string;


code:
import { __assign } from "tslib";
import { pascalCase, pascalCaseTransform, pascalCaseTransformMerge, } from "pascal-case";
export function camelCaseTransform(input, index) {
    if (index === 0)
        return input.toLowerCase();
    return pascalCaseTransform(input, index);
}
export function camelCaseTransformMerge(input, index) {
    if (index === 0)
        return input.toLowerCase();
    return pascalCaseTransformMerge(input);
}
export function camelCase(input, options) {
    if (options === void 0) { options = {}; }
    return pascalCase(input, __assign({ transform: camelCaseTransform }, options));
}
//# sourceMappingURL=index.js.map


code:
import { camelCase, camelCaseTransformMerge } from ".";
var TEST_CASES = [
    ["", ""],
    ["test", "test"],
    ["test string", "testString"],
    ["Test String", "testString"],
    ["TestV2", "testV2"],
    ["_foo_bar_", "fooBar"],
    ["version 1.2.10", "version_1_2_10"],
    ["version 1.21.0", "version_1_21_0"],
    ["version 1.2.10", "version1210", { transform: camelCaseTransformMerge }],
];
describe("camel case", function () {
    var _loop_1 = function (input, result, options) {
        it(input + " -> " + result, function () {
            expect(camelCase(input, options)).toEqual(result);
        });
    };
    for (var _i = 0, TEST_CASES_1 = TEST_CASES; _i < TEST_CASES_1.length; _i++) {
        var _a = TEST_CASES_1[_i], input = _a[0], result = _a[1], options = _a[2];
        _loop_1(input, result, options);
    }
});
//# sourceMappingURL=index.spec.js.map


code:
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.camelCase = exports.camelCaseTransformMerge = exports.camelCaseTransform = void 0;
var tslib_1 = require("tslib");
var pascal_case_1 = require("pascal-case");
function camelCaseTransform(input, index) {
    if (index === 0)
        return input.toLowerCase();
    return pascal_case_1.pascalCaseTransform(input, index);
}
exports.camelCaseTransform = camelCaseTransform;
function camelCaseTransformMerge(input, index) {
    if (index === 0)
        return input.toLowerCase();
    return pascal_case_1.pascalCaseTransformMerge(input);
}
exports.camelCaseTransformMerge = camelCaseTransformMerge;
function camelCase(input, options) {
    if (options === void 0) { options = {}; }
    return pascal_case_1.pascalCase(input, tslib_1.__assign({ transform: camelCaseTransform }, options));
}
exports.camelCase = camelCase;
//# sourceMappingURL=index.js.map


code:
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var _1 = require(".");
var TEST_CASES = [
    ["", ""],
    ["test", "test"],
    ["test string", "testString"],
    ["Test String", "testString"],
    ["TestV2", "testV2"],
    ["_foo_bar_", "fooBar"],
    ["version 1.2.10", "version_1_2_10"],
    ["version 1.21.0", "version_1_21_0"],
    ["version 1.2.10", "version1210", { transform: _1.camelCaseTransformMerge }],
];
describe("camel case", function () {
    var _loop_1 = function (input, result, options) {
        it(input + " -> " + result, function () {
            expect(_1.camelCase(input, options)).toEqual(result);
        });
    };
    for (var _i = 0, TEST_CASES_1 = TEST_CASES; _i < TEST_CASES_1.length; _i++) {
        var _a = TEST_CASES_1[_i], input = _a[0], result = _a[1], options = _a[2];
        _loop_1(input, result, options);
    }
});
//# sourceMappingURL=index.spec.js.map


camel-case

description: Transform into a string with the separator denoted by the next word capitalized

files: dist/ dist.es2015/ LICENSE

lint: tslint "src/**/*" --project tsconfig.json

build: rimraf dist/ dist.es2015/ && tsc && tsc -P tsconfig.es2015.json

specs: jest --coverage

test: npm run build && npm run lint && npm run specs

size: size-limit

prepare: npm run build

keywords: camel case camelcase camel-case convert transform identifier

\.tsx?$: ts-jest

moduleFileExtensions: ts tsx js jsx json node

access: public


code:
declare namespace camelcase {
	interface Options {
		/**
		Uppercase the first character: `foo-bar` → `FooBar`.

		@default false
		*/
		readonly pascalCase?: boolean;

		/**
		Preserve the consecutive uppercase characters: `foo-BAR` → `FooBAR`.

		@default false
		*/
		readonly preserveConsecutiveUppercase?: boolean;

		/**
		The locale parameter indicates the locale to be used to convert to upper/lower case according to any locale-specific case mappings. If multiple locales are given in an array, the best available locale is used.

		Setting `locale: false` ignores the platform locale and uses the [Unicode Default Case Conversion](https://unicode-org.github.io/icu/userguide/transforms/casemappings.html#simple-single-character-case-mapping) algorithm.

		Default: The host environment’s current locale.

		@example
		```
		import camelCase = require('camelcase');

		camelCase('lorem-ipsum', {locale: 'en-US'});
		//=> 'loremIpsum'
		camelCase('lorem-ipsum', {locale: 'tr-TR'});
		//=> 'loremİpsum'
		camelCase('lorem-ipsum', {locale: ['en-US', 'en-GB']});
		//=> 'loremIpsum'
		camelCase('lorem-ipsum', {locale: ['tr', 'TR', 'tr-TR']});
		//=> 'loremİpsum'
		```
		*/
		readonly locale?: false | string | readonly string[];
	}
}

/**
Convert a dash/dot/underscore/space separated string to camelCase or PascalCase: `foo-bar` → `fooBar`.

Correctly handles Unicode strings.

@param input - String to convert to camel case.

@example
```
import camelCase = require('camelcase');

camelCase('foo-bar');
//=> 'fooBar'

camelCase('foo_bar');
//=> 'fooBar'

camelCase('Foo-Bar');
//=> 'fooBar'

camelCase('розовый_пушистый_единорог');
//=> 'розовыйПушистыйЕдинорог'

camelCase('Foo-Bar', {pascalCase: true});
//=> 'FooBar'

camelCase('--foo.bar', {pascalCase: false});
//=> 'fooBar'

camelCase('Foo-BAR', {preserveConsecutiveUppercase: true});
//=> 'fooBAR'

camelCase('fooBAR', {pascalCase: true, preserveConsecutiveUppercase: true}));
//=> 'FooBAR'

camelCase('foo bar');
//=> 'fooBar'

console.log(process.argv[3]);
//=> '--foo-bar'
camelCase(process.argv[3]);
//=> 'fooBar'

camelCase(['foo', 'bar']);
//=> 'fooBar'

camelCase(['__foo__', '--bar'], {pascalCase: true});
//=> 'FooBar'

camelCase(['foo', 'BAR'], {pascalCase: true, preserveConsecutiveUppercase: true})
//=> 'FooBAR'

camelCase('lorem-ipsum', {locale: 'en-US'});
//=> 'loremIpsum'
```
*/
declare function camelcase(
	input: string | readonly string[],
	options?: camelcase.Options
): string;

export = camelcase;


code:
'use strict';

const UPPERCASE = /[\p{Lu}]/u;
const LOWERCASE = /[\p{Ll}]/u;
const LEADING_CAPITAL = /^[\p{Lu}](?![\p{Lu}])/gu;
const IDENTIFIER = /([\p{Alpha}\p{N}_]|$)/u;
const SEPARATORS = /[_.\- ]+/;

const LEADING_SEPARATORS = new RegExp('^' + SEPARATORS.source);
const SEPARATORS_AND_IDENTIFIER = new RegExp(SEPARATORS.source + IDENTIFIER.source, 'gu');
const NUMBERS_AND_IDENTIFIER = new RegExp('\\d+' + IDENTIFIER.source, 'gu');

const preserveCamelCase = (string, toLowerCase, toUpperCase) => {
	let isLastCharLower = false;
	let isLastCharUpper = false;
	let isLastLastCharUpper = false;

	for (let i = 0; i < string.length; i++) {
		const character = string[i];

		if (isLastCharLower && UPPERCASE.test(character)) {
			string = string.slice(0, i) + '-' + string.slice(i);
			isLastCharLower = false;
			isLastLastCharUpper = isLastCharUpper;
			isLastCharUpper = true;
			i++;
		} else if (isLastCharUpper && isLastLastCharUpper && LOWERCASE.test(character)) {
			string = string.slice(0, i - 1) + '-' + string.slice(i - 1);
			isLastLastCharUpper = isLastCharUpper;
			isLastCharUpper = false;
			isLastCharLower = true;
		} else {
			isLastCharLower = toLowerCase(character) === character && toUpperCase(character) !== character;
			isLastLastCharUpper = isLastCharUpper;
			isLastCharUpper = toUpperCase(character) === character && toLowerCase(character) !== character;
		}
	}

	return string;
};

const preserveConsecutiveUppercase = (input, toLowerCase) => {
	LEADING_CAPITAL.lastIndex = 0;

	return input.replace(LEADING_CAPITAL, m1 => toLowerCase(m1));
};

const postProcess = (input, toUpperCase) => {
	SEPARATORS_AND_IDENTIFIER.lastIndex = 0;
	NUMBERS_AND_IDENTIFIER.lastIndex = 0;

	return input.replace(SEPARATORS_AND_IDENTIFIER, (_, identifier) => toUpperCase(identifier))
		.replace(NUMBERS_AND_IDENTIFIER, m => toUpperCase(m));
};

const camelCase = (input, options) => {
	if (!(typeof input === 'string' || Array.isArray(input))) {
		throw new TypeError('Expected the input to be `string | string[]`');
	}

	options = {
		pascalCase: false,
		preserveConsecutiveUppercase: false,
		...options
	};

	if (Array.isArray(input)) {
		input = input.map(x => x.trim())
			.filter(x => x.length)
			.join('-');
	} else {
		input = input.trim();
	}

	if (input.length === 0) {
		return '';
	}

	const toLowerCase = options.locale === false ?
		string => string.toLowerCase() :
		string => string.toLocaleLowerCase(options.locale);
	const toUpperCase = options.locale === false ?
		string => string.toUpperCase() :
		string => string.toLocaleUpperCase(options.locale);

	if (input.length === 1) {
		return options.pascalCase ? toUpperCase(input) : toLowerCase(input);
	}

	const hasUpperCase = input !== toLowerCase(input);

	if (hasUpperCase) {
		input = preserveCamelCase(input, toLowerCase, toUpperCase);
	}

	input = input.replace(LEADING_SEPARATORS, '');

	if (options.preserveConsecutiveUppercase) {
		input = preserveConsecutiveUppercase(input, toLowerCase);
	} else {
		input = toLowerCase(input);
	}

	if (options.pascalCase) {
		input = toUpperCase(input.charAt(0)) + input.slice(1);
	}

	return postProcess(input, toUpperCase);
};

module.exports = camelCase;
// TODO: Remove this for the next major release
module.exports.default = camelCase;


camelcase

description: Convert a dash/dot/underscore/space separated string to camelCase or PascalCase: `foo-bar` → `fooBar`

repository: sindresorhus/camelcase

keywords: camelcase camel-case camel case dash hyphen dot underscore separator string text convert pascalcase pascal-case