Index: frontend/node_modules/es-abstract/es2017.js
===================================================================
--- frontend/node_modules/es-abstract/es2017.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/es-abstract/es2017.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,157 @@
+'use strict';
+
+/* eslint global-require: 0 */
+// https://262.ecma-international.org/8.0/#sec-abstract-operations
+var ES2017 = {
+	'Abstract Equality Comparison': require('./2017/AbstractEqualityComparison'),
+	'Abstract Relational Comparison': require('./2017/AbstractRelationalComparison'),
+	'Strict Equality Comparison': require('./2017/StrictEqualityComparison'),
+	abs: require('./2017/abs'),
+	AdvanceStringIndex: require('./2017/AdvanceStringIndex'),
+	ArrayCreate: require('./2017/ArrayCreate'),
+	ArraySetLength: require('./2017/ArraySetLength'),
+	ArraySpeciesCreate: require('./2017/ArraySpeciesCreate'),
+	Call: require('./2017/Call'),
+	Canonicalize: require('./2017/Canonicalize'),
+	CanonicalNumericIndexString: require('./2017/CanonicalNumericIndexString'),
+	CharacterRange: require('./2017/CharacterRange'),
+	CompletePropertyDescriptor: require('./2017/CompletePropertyDescriptor'),
+	CompletionRecord: require('./2017/CompletionRecord'),
+	CreateDataProperty: require('./2017/CreateDataProperty'),
+	CreateDataPropertyOrThrow: require('./2017/CreateDataPropertyOrThrow'),
+	CreateHTML: require('./2017/CreateHTML'),
+	CreateIterResultObject: require('./2017/CreateIterResultObject'),
+	CreateListFromArrayLike: require('./2017/CreateListFromArrayLike'),
+	CreateMethodProperty: require('./2017/CreateMethodProperty'),
+	DateFromTime: require('./2017/DateFromTime'),
+	Day: require('./2017/Day'),
+	DayFromYear: require('./2017/DayFromYear'),
+	DaysInYear: require('./2017/DaysInYear'),
+	DayWithinYear: require('./2017/DayWithinYear'),
+	DefinePropertyOrThrow: require('./2017/DefinePropertyOrThrow'),
+	DeletePropertyOrThrow: require('./2017/DeletePropertyOrThrow'),
+	DetachArrayBuffer: require('./2017/DetachArrayBuffer'),
+	EnumerableOwnProperties: require('./2017/EnumerableOwnProperties'),
+	floor: require('./2017/floor'),
+	FromPropertyDescriptor: require('./2017/FromPropertyDescriptor'),
+	Get: require('./2017/Get'),
+	GetGlobalObject: require('./2017/GetGlobalObject'),
+	GetIterator: require('./2017/GetIterator'),
+	GetMethod: require('./2017/GetMethod'),
+	GetOwnPropertyKeys: require('./2017/GetOwnPropertyKeys'),
+	GetPrototypeFromConstructor: require('./2017/GetPrototypeFromConstructor'),
+	GetSubstitution: require('./2017/GetSubstitution'),
+	GetV: require('./2017/GetV'),
+	GetValueFromBuffer: require('./2017/GetValueFromBuffer'),
+	HasOwnProperty: require('./2017/HasOwnProperty'),
+	HasProperty: require('./2017/HasProperty'),
+	HourFromTime: require('./2017/HourFromTime'),
+	InLeapYear: require('./2017/InLeapYear'),
+	InstanceofOperator: require('./2017/InstanceofOperator'),
+	IntegerIndexedElementGet: require('./2017/IntegerIndexedElementGet'),
+	IntegerIndexedElementSet: require('./2017/IntegerIndexedElementSet'),
+	InternalizeJSONProperty: require('./2017/InternalizeJSONProperty'),
+	Invoke: require('./2017/Invoke'),
+	IsAccessorDescriptor: require('./2017/IsAccessorDescriptor'),
+	IsArray: require('./2017/IsArray'),
+	IsCallable: require('./2017/IsCallable'),
+	IsCompatiblePropertyDescriptor: require('./2017/IsCompatiblePropertyDescriptor'),
+	IsConcatSpreadable: require('./2017/IsConcatSpreadable'),
+	IsConstructor: require('./2017/IsConstructor'),
+	IsDataDescriptor: require('./2017/IsDataDescriptor'),
+	IsDetachedBuffer: require('./2017/IsDetachedBuffer'),
+	IsExtensible: require('./2017/IsExtensible'),
+	IsGenericDescriptor: require('./2017/IsGenericDescriptor'),
+	IsInteger: require('./2017/IsInteger'),
+	IsPromise: require('./2017/IsPromise'),
+	IsPropertyDescriptor: require('./2017/IsPropertyDescriptor'),
+	IsPropertyKey: require('./2017/IsPropertyKey'),
+	IsRegExp: require('./2017/IsRegExp'),
+	IsSharedArrayBuffer: require('./2017/IsSharedArrayBuffer'),
+	IsWordChar: require('./2017/IsWordChar'),
+	IterableToList: require('./2017/IterableToList'),
+	IteratorClose: require('./2017/IteratorClose'),
+	IteratorComplete: require('./2017/IteratorComplete'),
+	IteratorNext: require('./2017/IteratorNext'),
+	IteratorStep: require('./2017/IteratorStep'),
+	IteratorValue: require('./2017/IteratorValue'),
+	MakeDate: require('./2017/MakeDate'),
+	MakeDay: require('./2017/MakeDay'),
+	MakeTime: require('./2017/MakeTime'),
+	max: require('./2017/max'),
+	min: require('./2017/min'),
+	MinFromTime: require('./2017/MinFromTime'),
+	modulo: require('./2017/modulo'),
+	MonthFromTime: require('./2017/MonthFromTime'),
+	msFromTime: require('./2017/msFromTime'),
+	NewPromiseCapability: require('./2017/NewPromiseCapability'),
+	NormalCompletion: require('./2017/NormalCompletion'),
+	NumberToRawBytes: require('./2017/NumberToRawBytes'),
+	ObjectCreate: require('./2017/ObjectCreate'),
+	ObjectDefineProperties: require('./2017/ObjectDefineProperties'),
+	OrdinaryCreateFromConstructor: require('./2017/OrdinaryCreateFromConstructor'),
+	OrdinaryDefineOwnProperty: require('./2017/OrdinaryDefineOwnProperty'),
+	OrdinaryGetOwnProperty: require('./2017/OrdinaryGetOwnProperty'),
+	OrdinaryGetPrototypeOf: require('./2017/OrdinaryGetPrototypeOf'),
+	OrdinaryHasInstance: require('./2017/OrdinaryHasInstance'),
+	OrdinaryHasProperty: require('./2017/OrdinaryHasProperty'),
+	OrdinarySetPrototypeOf: require('./2017/OrdinarySetPrototypeOf'),
+	OrdinaryToPrimitive: require('./2017/OrdinaryToPrimitive'),
+	QuoteJSONString: require('./2017/QuoteJSONString'),
+	RawBytesToNumber: require('./2017/RawBytesToNumber'),
+	RegExpCreate: require('./2017/RegExpCreate'),
+	RegExpExec: require('./2017/RegExpExec'),
+	RequireObjectCoercible: require('./2017/RequireObjectCoercible'),
+	SameValue: require('./2017/SameValue'),
+	SameValueNonNumber: require('./2017/SameValueNonNumber'),
+	SameValueZero: require('./2017/SameValueZero'),
+	SecFromTime: require('./2017/SecFromTime'),
+	Set: require('./2017/Set'),
+	SetFunctionName: require('./2017/SetFunctionName'),
+	SetIntegrityLevel: require('./2017/SetIntegrityLevel'),
+	SetValueInBuffer: require('./2017/SetValueInBuffer'),
+	SpeciesConstructor: require('./2017/SpeciesConstructor'),
+	SplitMatch: require('./2017/SplitMatch'),
+	StringCreate: require('./2017/StringCreate'),
+	StringGetOwnProperty: require('./2017/StringGetOwnProperty'),
+	SymbolDescriptiveString: require('./2017/SymbolDescriptiveString'),
+	TestIntegrityLevel: require('./2017/TestIntegrityLevel'),
+	thisBooleanValue: require('./2017/thisBooleanValue'),
+	thisNumberValue: require('./2017/thisNumberValue'),
+	thisStringValue: require('./2017/thisStringValue'),
+	thisTimeValue: require('./2017/thisTimeValue'),
+	TimeClip: require('./2017/TimeClip'),
+	TimeFromYear: require('./2017/TimeFromYear'),
+	TimeWithinDay: require('./2017/TimeWithinDay'),
+	ToBoolean: require('./2017/ToBoolean'),
+	ToDateString: require('./2017/ToDateString'),
+	ToIndex: require('./2017/ToIndex'),
+	ToInt16: require('./2017/ToInt16'),
+	ToInt32: require('./2017/ToInt32'),
+	ToInt8: require('./2017/ToInt8'),
+	ToInteger: require('./2017/ToInteger'),
+	ToLength: require('./2017/ToLength'),
+	ToNumber: require('./2017/ToNumber'),
+	ToObject: require('./2017/ToObject'),
+	ToPrimitive: require('./2017/ToPrimitive'),
+	ToPropertyDescriptor: require('./2017/ToPropertyDescriptor'),
+	ToPropertyKey: require('./2017/ToPropertyKey'),
+	ToString: require('./2017/ToString'),
+	ToUint16: require('./2017/ToUint16'),
+	ToUint32: require('./2017/ToUint32'),
+	ToUint8: require('./2017/ToUint8'),
+	ToUint8Clamp: require('./2017/ToUint8Clamp'),
+	Type: require('./2017/Type'),
+	TypedArrayCreate: require('./2017/TypedArrayCreate'),
+	TypedArraySpeciesCreate: require('./2017/TypedArraySpeciesCreate'),
+	UTF16Decode: require('./2017/UTF16Decode'),
+	UTF16Encoding: require('./2017/UTF16Encoding'),
+	ValidateAndApplyPropertyDescriptor: require('./2017/ValidateAndApplyPropertyDescriptor'),
+	ValidateAtomicAccess: require('./2017/ValidateAtomicAccess'),
+	ValidateTypedArray: require('./2017/ValidateTypedArray'),
+	WeekDay: require('./2017/WeekDay'),
+	WordCharacters: require('./2017/WordCharacters'),
+	YearFromTime: require('./2017/YearFromTime')
+};
+
+module.exports = ES2017;