text: 
  'use strict';
  
  var GetIntrinsic = require('../GetIntrinsic');
  
  var $TypeError = GetIntrinsic('%TypeError%');
  var $parseInt = GetIntrinsic('%parseInt%');
  
  var inspect = require('object-inspect');
  
  var regexTester = require('../helpers/regexTester');
  var callBound = require('../helpers/callBound');
  var every = require('../helpers/every');
  
  var isDigit = regexTester(/^[0-9]$/);
  
  var $charAt = callBound('String.prototype.charAt');
  var $strSlice = callBound('String.prototype.slice');
  
  var IsArray = require('./IsArray');
  var IsInteger = require('./IsInteger');
  var Type = require('./Type');
  
  var canDistinguishSparseFromUndefined = 0 in [undefined]; // IE 6 - 8 have a bug where this returns false
  
  var isStringOrHole = function (capture, index, arr) {
  	return Type(capture) === 'String' || (canDistinguishSparseFromUndefined ? !(index in arr) : Type(capture) === 'Undefined');
  };
  
  // https://www.ecma-international.org/ecma-262/6.0/#sec-getsubstitution
  
  // eslint-disable-next-line max-statements, max-params, max-lines-per-function
  module.exports = function GetSubstitution(matched, str, position, captures, replacement) {
  	if (Type(matched) !== 'String') {
  		throw new $TypeError('Assertion failed: `matched` must be a String');
  	}
  	var matchLength = matched.length;
  
  	if (Type(str) !== 'String') {
  		throw new $TypeError('Assertion failed: `str` must be a String');
  	}
  	var stringLength = str.length;
  
  	if (!IsInteger(position) || position < 0 || position > stringLength) {
  		throw new $TypeError('Assertion failed: `position` must be a nonnegative integer, and less than or equal to the length of `string`, got ' + inspect(position));
  	}
  
  	if (!IsArray(captures) || !every(captures, isStringOrHole)) {
  		throw new $TypeError('Assertion failed: `captures` must be a List of Strings, got ' + inspect(captures));
  	}
  
  	if (Type(replacement) !== 'String') {
  		throw new $TypeError('Assertion failed: `replacement` must be a String');
  	}
  
  	var tailPos = position + matchLength;
  	var m = captures.length;
  
  	var result = '';
  	for (var i = 0; i < replacement.length; i += 1) {
  		// if this is a $, and it's not the end of the replacement
  		var current = $charAt(replacement, i);
  		var isLast = (i + 1) >= replacement.length;
  		var nextIsLast = (i + 2) >= replacement.length;
  		if (current === '$' && !isLast) {
  			var next = $charAt(replacement, i + 1);
  			if (next === '$') {
  				result += '$';
  				i += 1;
  			} else if (next === '&') {
  				result += matched;
  				i += 1;
  			} else if (next === '`') {
  				result += position === 0 ? '' : $strSlice(str, 0, position - 1);
  				i += 1;
  			} else if (next === "'") {
  				result += tailPos >= stringLength ? '' : $strSlice(str, tailPos);
  				i += 1;
  			} else {
  				var nextNext = nextIsLast ? null : $charAt(replacement, i + 2);
  				if (isDigit(next) && next !== '0' && (nextIsLast || !isDigit(nextNext))) {
  					// $1 through $9, and not followed by a digit
  					var n = $parseInt(next, 10);
  					// if (n > m, impl-defined)
  					result += (n <= m && Type(captures[n - 1]) === 'Undefined') ? '' : captures[n - 1];
  					i += 1;
  				} else if (isDigit(next) && (nextIsLast || isDigit(nextNext))) {
  					// $00 through $99
  					var nn = next + nextNext;
  					var nnI = $parseInt(nn, 10) - 1;
  					// if nn === '00' or nn > m, impl-defined
  					result += (nn <= m && Type(captures[nnI]) === 'Undefined') ? '' : captures[nnI];
  					i += 2;
  				} else {
  					result += '$';
  				}
  			}
  		} else {
  			// the final $, or else not a $
  			result += $charAt(replacement, i);
  		}
  	}
  	return result;
  };
  