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diff --git a/school/node_modules/punycode/LICENSE-MIT.txt b/school/node_modules/punycode/LICENSE-MIT.txt
deleted file mode 100644
index a41e0a7..0000000
--- a/school/node_modules/punycode/LICENSE-MIT.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-Copyright Mathias Bynens <https://mathiasbynens.be/>
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/school/node_modules/punycode/README.md b/school/node_modules/punycode/README.md
deleted file mode 100644
index ee2f9d6..0000000
--- a/school/node_modules/punycode/README.md
+++ /dev/null
@@ -1,122 +0,0 @@
-# Punycode.js [![Build status](https://travis-ci.org/bestiejs/punycode.js.svg?branch=master)](https://travis-ci.org/bestiejs/punycode.js) [![Code coverage status](http://img.shields.io/codecov/c/github/bestiejs/punycode.js.svg)](https://codecov.io/gh/bestiejs/punycode.js) [![Dependency status](https://gemnasium.com/bestiejs/punycode.js.svg)](https://gemnasium.com/bestiejs/punycode.js)
-
-Punycode.js is a robust Punycode converter that fully complies to [RFC 3492](https://tools.ietf.org/html/rfc3492) and [RFC 5891](https://tools.ietf.org/html/rfc5891).
-
-This JavaScript library is the result of comparing, optimizing and documenting different open-source implementations of the Punycode algorithm:
-
-* [The C example code from RFC 3492](https://tools.ietf.org/html/rfc3492#appendix-C)
-* [`punycode.c` by _Markus W. Scherer_ (IBM)](http://opensource.apple.com/source/ICU/ICU-400.42/icuSources/common/punycode.c)
-* [`punycode.c` by _Ben Noordhuis_](https://github.com/bnoordhuis/punycode/blob/master/punycode.c)
-* [JavaScript implementation by _some_](http://stackoverflow.com/questions/183485/can-anyone-recommend-a-good-free-javascript-for-punycode-to-unicode-conversion/301287#301287)
-* [`punycode.js` by _Ben Noordhuis_](https://github.com/joyent/node/blob/426298c8c1c0d5b5224ac3658c41e7c2a3fe9377/lib/punycode.js) (note: [not fully compliant](https://github.com/joyent/node/issues/2072))
-
-This project was [bundled](https://github.com/joyent/node/blob/master/lib/punycode.js) with Node.js from [v0.6.2+](https://github.com/joyent/node/compare/975f1930b1...61e796decc) until [v7](https://github.com/nodejs/node/pull/7941) (soft-deprecated).
-
-The current version supports recent versions of Node.js only. It provides a CommonJS module and an ES6 module. For the old version that offers the same functionality with broader support, including Rhino, Ringo, Narwhal, and web browsers, see [v1.4.1](https://github.com/bestiejs/punycode.js/releases/tag/v1.4.1).
-
-## Installation
-
-Via [npm](https://www.npmjs.com/):
-
-```bash
-npm install punycode --save
-```
-
-In [Node.js](https://nodejs.org/):
-
-```js
-const punycode = require('punycode');
-```
-
-## API
-
-### `punycode.decode(string)`
-
-Converts a Punycode string of ASCII symbols to a string of Unicode symbols.
-
-```js
-// decode domain name parts
-punycode.decode('maana-pta'); // 'mañana'
-punycode.decode('--dqo34k'); // '☃-⌘'
-```
-
-### `punycode.encode(string)`
-
-Converts a string of Unicode symbols to a Punycode string of ASCII symbols.
-
-```js
-// encode domain name parts
-punycode.encode('mañana'); // 'maana-pta'
-punycode.encode('☃-⌘'); // '--dqo34k'
-```
-
-### `punycode.toUnicode(input)`
-
-Converts a Punycode string representing a domain name or an email address to Unicode. Only the Punycoded parts of the input will be converted, i.e. it doesn’t matter if you call it on a string that has already been converted to Unicode.
-
-```js
-// decode domain names
-punycode.toUnicode('xn--maana-pta.com');
-// → 'mañana.com'
-punycode.toUnicode('xn----dqo34k.com');
-// → '☃-⌘.com'
-
-// decode email addresses
-punycode.toUnicode('джумла@xn--p-8sbkgc5ag7bhce.xn--ba-lmcq');
-// → 'джумла@джpумлатест.bрфa'
-```
-
-### `punycode.toASCII(input)`
-
-Converts a lowercased Unicode string representing a domain name or an email address to Punycode. Only the non-ASCII parts of the input will be converted, i.e. it doesn’t matter if you call it with a domain that’s already in ASCII.
-
-```js
-// encode domain names
-punycode.toASCII('mañana.com');
-// → 'xn--maana-pta.com'
-punycode.toASCII('☃-⌘.com');
-// → 'xn----dqo34k.com'
-
-// encode email addresses
-punycode.toASCII('джумла@джpумлатест.bрфa');
-// → 'джумла@xn--p-8sbkgc5ag7bhce.xn--ba-lmcq'
-```
-
-### `punycode.ucs2`
-
-#### `punycode.ucs2.decode(string)`
-
-Creates an array containing the numeric code point values of each Unicode symbol in the string. While [JavaScript uses UCS-2 internally](https://mathiasbynens.be/notes/javascript-encoding), this function will convert a pair of surrogate halves (each of which UCS-2 exposes as separate characters) into a single code point, matching UTF-16.
-
-```js
-punycode.ucs2.decode('abc');
-// → [0x61, 0x62, 0x63]
-// surrogate pair for U+1D306 TETRAGRAM FOR CENTRE:
-punycode.ucs2.decode('\uD834\uDF06');
-// → [0x1D306]
-```
-
-#### `punycode.ucs2.encode(codePoints)`
-
-Creates a string based on an array of numeric code point values.
-
-```js
-punycode.ucs2.encode([0x61, 0x62, 0x63]);
-// → 'abc'
-punycode.ucs2.encode([0x1D306]);
-// → '\uD834\uDF06'
-```
-
-### `punycode.version`
-
-A string representing the current Punycode.js version number.
-
-## Author
-
-| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |
-|---|
-| [Mathias Bynens](https://mathiasbynens.be/) |
-
-## License
-
-Punycode.js is available under the [MIT](https://mths.be/mit) license.
diff --git a/school/node_modules/punycode/package.json b/school/node_modules/punycode/package.json
deleted file mode 100644
index 9202ccf..0000000
--- a/school/node_modules/punycode/package.json
+++ /dev/null
@@ -1,58 +0,0 @@
-{
-  "name": "punycode",
-  "version": "2.1.1",
-  "description": "A robust Punycode converter that fully complies to RFC 3492 and RFC 5891, and works on nearly all JavaScript platforms.",
-  "homepage": "https://mths.be/punycode",
-  "main": "punycode.js",
-  "jsnext:main": "punycode.es6.js",
-  "module": "punycode.es6.js",
-  "engines": {
-    "node": ">=6"
-  },
-  "keywords": [
-    "punycode",
-    "unicode",
-    "idn",
-    "idna",
-    "dns",
-    "url",
-    "domain"
-  ],
-  "license": "MIT",
-  "author": {
-    "name": "Mathias Bynens",
-    "url": "https://mathiasbynens.be/"
-  },
-  "contributors": [
-    {
-      "name": "Mathias Bynens",
-      "url": "https://mathiasbynens.be/"
-    }
-  ],
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/bestiejs/punycode.js.git"
-  },
-  "bugs": "https://github.com/bestiejs/punycode.js/issues",
-  "files": [
-    "LICENSE-MIT.txt",
-    "punycode.js",
-    "punycode.es6.js"
-  ],
-  "scripts": {
-    "test": "mocha tests",
-    "prepublish": "node scripts/prepublish.js"
-  },
-  "devDependencies": {
-    "codecov": "^1.0.1",
-    "istanbul": "^0.4.1",
-    "mocha": "^2.5.3"
-  },
-  "jspm": {
-    "map": {
-      "./punycode.js": {
-        "node": "@node/punycode"
-      }
-    }
-  }
-}
diff --git a/school/node_modules/punycode/punycode.es6.js b/school/node_modules/punycode/punycode.es6.js
deleted file mode 100644
index 4610bc9..0000000
--- a/school/node_modules/punycode/punycode.es6.js
+++ /dev/null
@@ -1,441 +0,0 @@
-'use strict';
-
-/** Highest positive signed 32-bit float value */
-const maxInt = 2147483647; // aka. 0x7FFFFFFF or 2^31-1
-
-/** Bootstring parameters */
-const base = 36;
-const tMin = 1;
-const tMax = 26;
-const skew = 38;
-const damp = 700;
-const initialBias = 72;
-const initialN = 128; // 0x80
-const delimiter = '-'; // '\x2D'
-
-/** Regular expressions */
-const regexPunycode = /^xn--/;
-const regexNonASCII = /[^\0-\x7E]/; // non-ASCII chars
-const regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g; // RFC 3490 separators
-
-/** Error messages */
-const errors = {
-	'overflow': 'Overflow: input needs wider integers to process',
-	'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
-	'invalid-input': 'Invalid input'
-};
-
-/** Convenience shortcuts */
-const baseMinusTMin = base - tMin;
-const floor = Math.floor;
-const stringFromCharCode = String.fromCharCode;
-
-/*--------------------------------------------------------------------------*/
-
-/**
- * A generic error utility function.
- * @private
- * @param {String} type The error type.
- * @returns {Error} Throws a `RangeError` with the applicable error message.
- */
-function error(type) {
-	throw new RangeError(errors[type]);
-}
-
-/**
- * A generic `Array#map` utility function.
- * @private
- * @param {Array} array The array to iterate over.
- * @param {Function} callback The function that gets called for every array
- * item.
- * @returns {Array} A new array of values returned by the callback function.
- */
-function map(array, fn) {
-	const result = [];
-	let length = array.length;
-	while (length--) {
-		result[length] = fn(array[length]);
-	}
-	return result;
-}
-
-/**
- * A simple `Array#map`-like wrapper to work with domain name strings or email
- * addresses.
- * @private
- * @param {String} domain The domain name or email address.
- * @param {Function} callback The function that gets called for every
- * character.
- * @returns {Array} A new string of characters returned by the callback
- * function.
- */
-function mapDomain(string, fn) {
-	const parts = string.split('@');
-	let result = '';
-	if (parts.length > 1) {
-		// In email addresses, only the domain name should be punycoded. Leave
-		// the local part (i.e. everything up to `@`) intact.
-		result = parts[0] + '@';
-		string = parts[1];
-	}
-	// Avoid `split(regex)` for IE8 compatibility. See #17.
-	string = string.replace(regexSeparators, '\x2E');
-	const labels = string.split('.');
-	const encoded = map(labels, fn).join('.');
-	return result + encoded;
-}
-
-/**
- * Creates an array containing the numeric code points of each Unicode
- * character in the string. While JavaScript uses UCS-2 internally,
- * this function will convert a pair of surrogate halves (each of which
- * UCS-2 exposes as separate characters) into a single code point,
- * matching UTF-16.
- * @see `punycode.ucs2.encode`
- * @see <https://mathiasbynens.be/notes/javascript-encoding>
- * @memberOf punycode.ucs2
- * @name decode
- * @param {String} string The Unicode input string (UCS-2).
- * @returns {Array} The new array of code points.
- */
-function ucs2decode(string) {
-	const output = [];
-	let counter = 0;
-	const length = string.length;
-	while (counter < length) {
-		const value = string.charCodeAt(counter++);
-		if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
-			// It's a high surrogate, and there is a next character.
-			const extra = string.charCodeAt(counter++);
-			if ((extra & 0xFC00) == 0xDC00) { // Low surrogate.
-				output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
-			} else {
-				// It's an unmatched surrogate; only append this code unit, in case the
-				// next code unit is the high surrogate of a surrogate pair.
-				output.push(value);
-				counter--;
-			}
-		} else {
-			output.push(value);
-		}
-	}
-	return output;
-}
-
-/**
- * Creates a string based on an array of numeric code points.
- * @see `punycode.ucs2.decode`
- * @memberOf punycode.ucs2
- * @name encode
- * @param {Array} codePoints The array of numeric code points.
- * @returns {String} The new Unicode string (UCS-2).
- */
-const ucs2encode = array => String.fromCodePoint(...array);
-
-/**
- * Converts a basic code point into a digit/integer.
- * @see `digitToBasic()`
- * @private
- * @param {Number} codePoint The basic numeric code point value.
- * @returns {Number} The numeric value of a basic code point (for use in
- * representing integers) in the range `0` to `base - 1`, or `base` if
- * the code point does not represent a value.
- */
-const basicToDigit = function(codePoint) {
-	if (codePoint - 0x30 < 0x0A) {
-		return codePoint - 0x16;
-	}
-	if (codePoint - 0x41 < 0x1A) {
-		return codePoint - 0x41;
-	}
-	if (codePoint - 0x61 < 0x1A) {
-		return codePoint - 0x61;
-	}
-	return base;
-};
-
-/**
- * Converts a digit/integer into a basic code point.
- * @see `basicToDigit()`
- * @private
- * @param {Number} digit The numeric value of a basic code point.
- * @returns {Number} The basic code point whose value (when used for
- * representing integers) is `digit`, which needs to be in the range
- * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
- * used; else, the lowercase form is used. The behavior is undefined
- * if `flag` is non-zero and `digit` has no uppercase form.
- */
-const digitToBasic = function(digit, flag) {
-	//  0..25 map to ASCII a..z or A..Z
-	// 26..35 map to ASCII 0..9
-	return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
-};
-
-/**
- * Bias adaptation function as per section 3.4 of RFC 3492.
- * https://tools.ietf.org/html/rfc3492#section-3.4
- * @private
- */
-const adapt = function(delta, numPoints, firstTime) {
-	let k = 0;
-	delta = firstTime ? floor(delta / damp) : delta >> 1;
-	delta += floor(delta / numPoints);
-	for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
-		delta = floor(delta / baseMinusTMin);
-	}
-	return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
-};
-
-/**
- * Converts a Punycode string of ASCII-only symbols to a string of Unicode
- * symbols.
- * @memberOf punycode
- * @param {String} input The Punycode string of ASCII-only symbols.
- * @returns {String} The resulting string of Unicode symbols.
- */
-const decode = function(input) {
-	// Don't use UCS-2.
-	const output = [];
-	const inputLength = input.length;
-	let i = 0;
-	let n = initialN;
-	let bias = initialBias;
-
-	// Handle the basic code points: let `basic` be the number of input code
-	// points before the last delimiter, or `0` if there is none, then copy
-	// the first basic code points to the output.
-
-	let basic = input.lastIndexOf(delimiter);
-	if (basic < 0) {
-		basic = 0;
-	}
-
-	for (let j = 0; j < basic; ++j) {
-		// if it's not a basic code point
-		if (input.charCodeAt(j) >= 0x80) {
-			error('not-basic');
-		}
-		output.push(input.charCodeAt(j));
-	}
-
-	// Main decoding loop: start just after the last delimiter if any basic code
-	// points were copied; start at the beginning otherwise.
-
-	for (let index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {
-
-		// `index` is the index of the next character to be consumed.
-		// Decode a generalized variable-length integer into `delta`,
-		// which gets added to `i`. The overflow checking is easier
-		// if we increase `i` as we go, then subtract off its starting
-		// value at the end to obtain `delta`.
-		let oldi = i;
-		for (let w = 1, k = base; /* no condition */; k += base) {
-
-			if (index >= inputLength) {
-				error('invalid-input');
-			}
-
-			const digit = basicToDigit(input.charCodeAt(index++));
-
-			if (digit >= base || digit > floor((maxInt - i) / w)) {
-				error('overflow');
-			}
-
-			i += digit * w;
-			const t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
-
-			if (digit < t) {
-				break;
-			}
-
-			const baseMinusT = base - t;
-			if (w > floor(maxInt / baseMinusT)) {
-				error('overflow');
-			}
-
-			w *= baseMinusT;
-
-		}
-
-		const out = output.length + 1;
-		bias = adapt(i - oldi, out, oldi == 0);
-
-		// `i` was supposed to wrap around from `out` to `0`,
-		// incrementing `n` each time, so we'll fix that now:
-		if (floor(i / out) > maxInt - n) {
-			error('overflow');
-		}
-
-		n += floor(i / out);
-		i %= out;
-
-		// Insert `n` at position `i` of the output.
-		output.splice(i++, 0, n);
-
-	}
-
-	return String.fromCodePoint(...output);
-};
-
-/**
- * Converts a string of Unicode symbols (e.g. a domain name label) to a
- * Punycode string of ASCII-only symbols.
- * @memberOf punycode
- * @param {String} input The string of Unicode symbols.
- * @returns {String} The resulting Punycode string of ASCII-only symbols.
- */
-const encode = function(input) {
-	const output = [];
-
-	// Convert the input in UCS-2 to an array of Unicode code points.
-	input = ucs2decode(input);
-
-	// Cache the length.
-	let inputLength = input.length;
-
-	// Initialize the state.
-	let n = initialN;
-	let delta = 0;
-	let bias = initialBias;
-
-	// Handle the basic code points.
-	for (const currentValue of input) {
-		if (currentValue < 0x80) {
-			output.push(stringFromCharCode(currentValue));
-		}
-	}
-
-	let basicLength = output.length;
-	let handledCPCount = basicLength;
-
-	// `handledCPCount` is the number of code points that have been handled;
-	// `basicLength` is the number of basic code points.
-
-	// Finish the basic string with a delimiter unless it's empty.
-	if (basicLength) {
-		output.push(delimiter);
-	}
-
-	// Main encoding loop:
-	while (handledCPCount < inputLength) {
-
-		// All non-basic code points < n have been handled already. Find the next
-		// larger one:
-		let m = maxInt;
-		for (const currentValue of input) {
-			if (currentValue >= n && currentValue < m) {
-				m = currentValue;
-			}
-		}
-
-		// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
-		// but guard against overflow.
-		const handledCPCountPlusOne = handledCPCount + 1;
-		if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
-			error('overflow');
-		}
-
-		delta += (m - n) * handledCPCountPlusOne;
-		n = m;
-
-		for (const currentValue of input) {
-			if (currentValue < n && ++delta > maxInt) {
-				error('overflow');
-			}
-			if (currentValue == n) {
-				// Represent delta as a generalized variable-length integer.
-				let q = delta;
-				for (let k = base; /* no condition */; k += base) {
-					const t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
-					if (q < t) {
-						break;
-					}
-					const qMinusT = q - t;
-					const baseMinusT = base - t;
-					output.push(
-						stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
-					);
-					q = floor(qMinusT / baseMinusT);
-				}
-
-				output.push(stringFromCharCode(digitToBasic(q, 0)));
-				bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
-				delta = 0;
-				++handledCPCount;
-			}
-		}
-
-		++delta;
-		++n;
-
-	}
-	return output.join('');
-};
-
-/**
- * Converts a Punycode string representing a domain name or an email address
- * to Unicode. Only the Punycoded parts of the input will be converted, i.e.
- * it doesn't matter if you call it on a string that has already been
- * converted to Unicode.
- * @memberOf punycode
- * @param {String} input The Punycoded domain name or email address to
- * convert to Unicode.
- * @returns {String} The Unicode representation of the given Punycode
- * string.
- */
-const toUnicode = function(input) {
-	return mapDomain(input, function(string) {
-		return regexPunycode.test(string)
-			? decode(string.slice(4).toLowerCase())
-			: string;
-	});
-};
-
-/**
- * Converts a Unicode string representing a domain name or an email address to
- * Punycode. Only the non-ASCII parts of the domain name will be converted,
- * i.e. it doesn't matter if you call it with a domain that's already in
- * ASCII.
- * @memberOf punycode
- * @param {String} input The domain name or email address to convert, as a
- * Unicode string.
- * @returns {String} The Punycode representation of the given domain name or
- * email address.
- */
-const toASCII = function(input) {
-	return mapDomain(input, function(string) {
-		return regexNonASCII.test(string)
-			? 'xn--' + encode(string)
-			: string;
-	});
-};
-
-/*--------------------------------------------------------------------------*/
-
-/** Define the public API */
-const punycode = {
-	/**
-	 * A string representing the current Punycode.js version number.
-	 * @memberOf punycode
-	 * @type String
-	 */
-	'version': '2.1.0',
-	/**
-	 * An object of methods to convert from JavaScript's internal character
-	 * representation (UCS-2) to Unicode code points, and back.
-	 * @see <https://mathiasbynens.be/notes/javascript-encoding>
-	 * @memberOf punycode
-	 * @type Object
-	 */
-	'ucs2': {
-		'decode': ucs2decode,
-		'encode': ucs2encode
-	},
-	'decode': decode,
-	'encode': encode,
-	'toASCII': toASCII,
-	'toUnicode': toUnicode
-};
-
-export { ucs2decode, ucs2encode, decode, encode, toASCII, toUnicode };
-export default punycode;
diff --git a/school/node_modules/punycode/punycode.js b/school/node_modules/punycode/punycode.js
deleted file mode 100644
index ea61fd0..0000000
--- a/school/node_modules/punycode/punycode.js
+++ /dev/null
@@ -1,440 +0,0 @@
-'use strict';
-
-/** Highest positive signed 32-bit float value */
-const maxInt = 2147483647; // aka. 0x7FFFFFFF or 2^31-1
-
-/** Bootstring parameters */
-const base = 36;
-const tMin = 1;
-const tMax = 26;
-const skew = 38;
-const damp = 700;
-const initialBias = 72;
-const initialN = 128; // 0x80
-const delimiter = '-'; // '\x2D'
-
-/** Regular expressions */
-const regexPunycode = /^xn--/;
-const regexNonASCII = /[^\0-\x7E]/; // non-ASCII chars
-const regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g; // RFC 3490 separators
-
-/** Error messages */
-const errors = {
-	'overflow': 'Overflow: input needs wider integers to process',
-	'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
-	'invalid-input': 'Invalid input'
-};
-
-/** Convenience shortcuts */
-const baseMinusTMin = base - tMin;
-const floor = Math.floor;
-const stringFromCharCode = String.fromCharCode;
-
-/*--------------------------------------------------------------------------*/
-
-/**
- * A generic error utility function.
- * @private
- * @param {String} type The error type.
- * @returns {Error} Throws a `RangeError` with the applicable error message.
- */
-function error(type) {
-	throw new RangeError(errors[type]);
-}
-
-/**
- * A generic `Array#map` utility function.
- * @private
- * @param {Array} array The array to iterate over.
- * @param {Function} callback The function that gets called for every array
- * item.
- * @returns {Array} A new array of values returned by the callback function.
- */
-function map(array, fn) {
-	const result = [];
-	let length = array.length;
-	while (length--) {
-		result[length] = fn(array[length]);
-	}
-	return result;
-}
-
-/**
- * A simple `Array#map`-like wrapper to work with domain name strings or email
- * addresses.
- * @private
- * @param {String} domain The domain name or email address.
- * @param {Function} callback The function that gets called for every
- * character.
- * @returns {Array} A new string of characters returned by the callback
- * function.
- */
-function mapDomain(string, fn) {
-	const parts = string.split('@');
-	let result = '';
-	if (parts.length > 1) {
-		// In email addresses, only the domain name should be punycoded. Leave
-		// the local part (i.e. everything up to `@`) intact.
-		result = parts[0] + '@';
-		string = parts[1];
-	}
-	// Avoid `split(regex)` for IE8 compatibility. See #17.
-	string = string.replace(regexSeparators, '\x2E');
-	const labels = string.split('.');
-	const encoded = map(labels, fn).join('.');
-	return result + encoded;
-}
-
-/**
- * Creates an array containing the numeric code points of each Unicode
- * character in the string. While JavaScript uses UCS-2 internally,
- * this function will convert a pair of surrogate halves (each of which
- * UCS-2 exposes as separate characters) into a single code point,
- * matching UTF-16.
- * @see `punycode.ucs2.encode`
- * @see <https://mathiasbynens.be/notes/javascript-encoding>
- * @memberOf punycode.ucs2
- * @name decode
- * @param {String} string The Unicode input string (UCS-2).
- * @returns {Array} The new array of code points.
- */
-function ucs2decode(string) {
-	const output = [];
-	let counter = 0;
-	const length = string.length;
-	while (counter < length) {
-		const value = string.charCodeAt(counter++);
-		if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
-			// It's a high surrogate, and there is a next character.
-			const extra = string.charCodeAt(counter++);
-			if ((extra & 0xFC00) == 0xDC00) { // Low surrogate.
-				output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
-			} else {
-				// It's an unmatched surrogate; only append this code unit, in case the
-				// next code unit is the high surrogate of a surrogate pair.
-				output.push(value);
-				counter--;
-			}
-		} else {
-			output.push(value);
-		}
-	}
-	return output;
-}
-
-/**
- * Creates a string based on an array of numeric code points.
- * @see `punycode.ucs2.decode`
- * @memberOf punycode.ucs2
- * @name encode
- * @param {Array} codePoints The array of numeric code points.
- * @returns {String} The new Unicode string (UCS-2).
- */
-const ucs2encode = array => String.fromCodePoint(...array);
-
-/**
- * Converts a basic code point into a digit/integer.
- * @see `digitToBasic()`
- * @private
- * @param {Number} codePoint The basic numeric code point value.
- * @returns {Number} The numeric value of a basic code point (for use in
- * representing integers) in the range `0` to `base - 1`, or `base` if
- * the code point does not represent a value.
- */
-const basicToDigit = function(codePoint) {
-	if (codePoint - 0x30 < 0x0A) {
-		return codePoint - 0x16;
-	}
-	if (codePoint - 0x41 < 0x1A) {
-		return codePoint - 0x41;
-	}
-	if (codePoint - 0x61 < 0x1A) {
-		return codePoint - 0x61;
-	}
-	return base;
-};
-
-/**
- * Converts a digit/integer into a basic code point.
- * @see `basicToDigit()`
- * @private
- * @param {Number} digit The numeric value of a basic code point.
- * @returns {Number} The basic code point whose value (when used for
- * representing integers) is `digit`, which needs to be in the range
- * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
- * used; else, the lowercase form is used. The behavior is undefined
- * if `flag` is non-zero and `digit` has no uppercase form.
- */
-const digitToBasic = function(digit, flag) {
-	//  0..25 map to ASCII a..z or A..Z
-	// 26..35 map to ASCII 0..9
-	return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
-};
-
-/**
- * Bias adaptation function as per section 3.4 of RFC 3492.
- * https://tools.ietf.org/html/rfc3492#section-3.4
- * @private
- */
-const adapt = function(delta, numPoints, firstTime) {
-	let k = 0;
-	delta = firstTime ? floor(delta / damp) : delta >> 1;
-	delta += floor(delta / numPoints);
-	for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
-		delta = floor(delta / baseMinusTMin);
-	}
-	return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
-};
-
-/**
- * Converts a Punycode string of ASCII-only symbols to a string of Unicode
- * symbols.
- * @memberOf punycode
- * @param {String} input The Punycode string of ASCII-only symbols.
- * @returns {String} The resulting string of Unicode symbols.
- */
-const decode = function(input) {
-	// Don't use UCS-2.
-	const output = [];
-	const inputLength = input.length;
-	let i = 0;
-	let n = initialN;
-	let bias = initialBias;
-
-	// Handle the basic code points: let `basic` be the number of input code
-	// points before the last delimiter, or `0` if there is none, then copy
-	// the first basic code points to the output.
-
-	let basic = input.lastIndexOf(delimiter);
-	if (basic < 0) {
-		basic = 0;
-	}
-
-	for (let j = 0; j < basic; ++j) {
-		// if it's not a basic code point
-		if (input.charCodeAt(j) >= 0x80) {
-			error('not-basic');
-		}
-		output.push(input.charCodeAt(j));
-	}
-
-	// Main decoding loop: start just after the last delimiter if any basic code
-	// points were copied; start at the beginning otherwise.
-
-	for (let index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {
-
-		// `index` is the index of the next character to be consumed.
-		// Decode a generalized variable-length integer into `delta`,
-		// which gets added to `i`. The overflow checking is easier
-		// if we increase `i` as we go, then subtract off its starting
-		// value at the end to obtain `delta`.
-		let oldi = i;
-		for (let w = 1, k = base; /* no condition */; k += base) {
-
-			if (index >= inputLength) {
-				error('invalid-input');
-			}
-
-			const digit = basicToDigit(input.charCodeAt(index++));
-
-			if (digit >= base || digit > floor((maxInt - i) / w)) {
-				error('overflow');
-			}
-
-			i += digit * w;
-			const t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
-
-			if (digit < t) {
-				break;
-			}
-
-			const baseMinusT = base - t;
-			if (w > floor(maxInt / baseMinusT)) {
-				error('overflow');
-			}
-
-			w *= baseMinusT;
-
-		}
-
-		const out = output.length + 1;
-		bias = adapt(i - oldi, out, oldi == 0);
-
-		// `i` was supposed to wrap around from `out` to `0`,
-		// incrementing `n` each time, so we'll fix that now:
-		if (floor(i / out) > maxInt - n) {
-			error('overflow');
-		}
-
-		n += floor(i / out);
-		i %= out;
-
-		// Insert `n` at position `i` of the output.
-		output.splice(i++, 0, n);
-
-	}
-
-	return String.fromCodePoint(...output);
-};
-
-/**
- * Converts a string of Unicode symbols (e.g. a domain name label) to a
- * Punycode string of ASCII-only symbols.
- * @memberOf punycode
- * @param {String} input The string of Unicode symbols.
- * @returns {String} The resulting Punycode string of ASCII-only symbols.
- */
-const encode = function(input) {
-	const output = [];
-
-	// Convert the input in UCS-2 to an array of Unicode code points.
-	input = ucs2decode(input);
-
-	// Cache the length.
-	let inputLength = input.length;
-
-	// Initialize the state.
-	let n = initialN;
-	let delta = 0;
-	let bias = initialBias;
-
-	// Handle the basic code points.
-	for (const currentValue of input) {
-		if (currentValue < 0x80) {
-			output.push(stringFromCharCode(currentValue));
-		}
-	}
-
-	let basicLength = output.length;
-	let handledCPCount = basicLength;
-
-	// `handledCPCount` is the number of code points that have been handled;
-	// `basicLength` is the number of basic code points.
-
-	// Finish the basic string with a delimiter unless it's empty.
-	if (basicLength) {
-		output.push(delimiter);
-	}
-
-	// Main encoding loop:
-	while (handledCPCount < inputLength) {
-
-		// All non-basic code points < n have been handled already. Find the next
-		// larger one:
-		let m = maxInt;
-		for (const currentValue of input) {
-			if (currentValue >= n && currentValue < m) {
-				m = currentValue;
-			}
-		}
-
-		// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
-		// but guard against overflow.
-		const handledCPCountPlusOne = handledCPCount + 1;
-		if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
-			error('overflow');
-		}
-
-		delta += (m - n) * handledCPCountPlusOne;
-		n = m;
-
-		for (const currentValue of input) {
-			if (currentValue < n && ++delta > maxInt) {
-				error('overflow');
-			}
-			if (currentValue == n) {
-				// Represent delta as a generalized variable-length integer.
-				let q = delta;
-				for (let k = base; /* no condition */; k += base) {
-					const t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
-					if (q < t) {
-						break;
-					}
-					const qMinusT = q - t;
-					const baseMinusT = base - t;
-					output.push(
-						stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
-					);
-					q = floor(qMinusT / baseMinusT);
-				}
-
-				output.push(stringFromCharCode(digitToBasic(q, 0)));
-				bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
-				delta = 0;
-				++handledCPCount;
-			}
-		}
-
-		++delta;
-		++n;
-
-	}
-	return output.join('');
-};
-
-/**
- * Converts a Punycode string representing a domain name or an email address
- * to Unicode. Only the Punycoded parts of the input will be converted, i.e.
- * it doesn't matter if you call it on a string that has already been
- * converted to Unicode.
- * @memberOf punycode
- * @param {String} input The Punycoded domain name or email address to
- * convert to Unicode.
- * @returns {String} The Unicode representation of the given Punycode
- * string.
- */
-const toUnicode = function(input) {
-	return mapDomain(input, function(string) {
-		return regexPunycode.test(string)
-			? decode(string.slice(4).toLowerCase())
-			: string;
-	});
-};
-
-/**
- * Converts a Unicode string representing a domain name or an email address to
- * Punycode. Only the non-ASCII parts of the domain name will be converted,
- * i.e. it doesn't matter if you call it with a domain that's already in
- * ASCII.
- * @memberOf punycode
- * @param {String} input The domain name or email address to convert, as a
- * Unicode string.
- * @returns {String} The Punycode representation of the given domain name or
- * email address.
- */
-const toASCII = function(input) {
-	return mapDomain(input, function(string) {
-		return regexNonASCII.test(string)
-			? 'xn--' + encode(string)
-			: string;
-	});
-};
-
-/*--------------------------------------------------------------------------*/
-
-/** Define the public API */
-const punycode = {
-	/**
-	 * A string representing the current Punycode.js version number.
-	 * @memberOf punycode
-	 * @type String
-	 */
-	'version': '2.1.0',
-	/**
-	 * An object of methods to convert from JavaScript's internal character
-	 * representation (UCS-2) to Unicode code points, and back.
-	 * @see <https://mathiasbynens.be/notes/javascript-encoding>
-	 * @memberOf punycode
-	 * @type Object
-	 */
-	'ucs2': {
-		'decode': ucs2decode,
-		'encode': ucs2encode
-	},
-	'decode': decode,
-	'encode': encode,
-	'toASCII': toASCII,
-	'toUnicode': toUnicode
-};
-
-module.exports = punycode;