How to use the es-abstract/es6.ToString function in es-abstract

var atShim = function at(pos) {
	ES.RequireObjectCoercible(this);
	var O = ES.ToObject(this);
	var S = ES.ToString(O);
	var position = ES.ToInteger(pos);
	var size = S.length;
	if (position < 0 || position >= size) {
		return '';
	}
	// Get the first code unit and code unit value
	var cuFirst = S.charCodeAt(position);
	var cuSecond;
	var nextIndex = position + 1;
	var len = 1;
	// Check if it’s the start of a surrogate pair.
	var isHighSurrogate = cuFirst >= 0xD800 && cuFirst <= 0xDBFF;
	if (isHighSurrogate && size > nextIndex /* there is a next code unit */) {
		cuSecond = S.charCodeAt(nextIndex);
		if (cuSecond >= 0xDC00 && cuSecond <= 0xDFFF) { // low surrogate
			len = 2;

module.exports = function padStart(maxLength) {
	var O = ES.RequireObjectCoercible(this);
	var S = ES.ToString(O);
	var stringLength = ES.ToLength(S.length);
	var fillString;
	if (arguments.length > 1) {
		fillString = arguments[1];
	}
	var filler = typeof fillString === 'undefined' ? '' : ES.ToString(fillString);
	if (filler === '') {
		filler = ' ';
	}
	var intMaxLength = ES.ToLength(maxLength);
	if (intMaxLength <= stringLength) {
		return S;
	}
	var fillLen = intMaxLength - stringLength;
	while (filler.length < fillLen) {
		var fLen = filler.length;
		var remainingCodeUnits = fillLen - fLen;
		filler += fLen > remainingCodeUnits ? slice(filler, 0, remainingCodeUnits) : filler;
	}

	var truncatedStringFiller = filler.length > fillLen ? slice(filler, 0, fillLen) : filler;
	return truncatedStringFiller + S;

module.exports = function padStart(maxLength) {
	var O = ES.RequireObjectCoercible(this);
	var S = ES.ToString(O);
	var stringLength = ES.ToLength(S.length);
	var fillString;
	if (arguments.length > 1) {
		fillString = arguments[1];
	}
	var filler = typeof fillString === 'undefined' ? '' : ES.ToString(fillString);
	if (filler === '') {
		filler = ' ';
	}
	var intMaxLength = ES.ToLength(maxLength);
	if (intMaxLength <= stringLength) {
		return S;
	}
	var fillLen = intMaxLength - stringLength;
	while (filler.length < fillLen) {
		var fLen = filler.length;

module.exports = function padEnd(maxLength) {
	var O = ES.RequireObjectCoercible(this);
	var S = ES.ToString(O);
	var stringLength = ES.ToLength(S.length);
	var fillString;
	if (arguments.length > 1) {
		fillString = arguments[1];
	}
	var filler = typeof fillString === 'undefined' ? '' : ES.ToString(fillString);
	if (filler === '') {
		filler = ' ';
	}
	var intMaxLength = ES.ToLength(maxLength);
	if (intMaxLength <= stringLength) {
		return S;
	}
	var fillLen = intMaxLength - stringLength;
	while (filler.length < fillLen) {
		var fLen = filler.length;

module.exports = function padEnd(maxLength) {
	var O = ES.RequireObjectCoercible(this);
	var S = ES.ToString(O);
	var stringLength = ES.ToLength(S.length);
	var fillString;
	if (arguments.length > 1) {
		fillString = arguments[1];
	}
	var filler = typeof fillString === 'undefined' ? '' : ES.ToString(fillString);
	if (filler === '') {
		filler = ' ';
	}
	var intMaxLength = ES.ToLength(maxLength);
	if (intMaxLength <= stringLength) {
		return S;
	}
	var fillLen = intMaxLength - stringLength;
	while (filler.length < fillLen) {
		var fLen = filler.length;
		var remainingCodeUnits = fillLen - fLen;
		filler += fLen > remainingCodeUnits ? slice(filler, 0, remainingCodeUnits) : filler;
	}

	var truncatedStringFiller = filler.length > fillLen ? slice(filler, 0, fillLen) : filler;
	return S + truncatedStringFiller;