JS feature	TS lib	v8-android 9.93.0	v8-android 10.100.0	v8-android 9.93.0 (no Intl)	v8-android 10.100.0 (no Intl)	hermes 0.5.1	hermes 0.7.2	hermes 0.8.1	hermes 0.9.0	hermes 0.11.0	jsc-android 245459	jsc-android 250230	jsc-android 245459 (no Intl)	jsc-android 250230 (no Intl)	iOS 11	iOS 12	iOS 12.4	iOS 13	iOS 13.1	iOS 13.2	iOS 13.3	iOS 13.4	iOS 13.5	iOS 13.6	iOS 13.7	iOS 14	iOS 14.1	iOS 14.2	iOS 14.3	iOS 14.4	iOS 14.5	iOS 15	iOS 15.2
RN			*	*	*	*	0.63.x	0.64.x	0.65.x	0.66.x, 0.67.x	0.68.x, 0.69.x	0.60.x...0.64.x	0.65.x...0.69.x	0.60.x...0.64.x	0.65.x...0.69.x	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*
	Symbol	es2015.symbol	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Reflect	es2015.reflect	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Proxy	es2015.proxy	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Promise	es2015.promise	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Map	es2015.collection	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Set	es2015.collection	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	function* (){ ... }	es2015.generator	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Symbol.iterator	es2015.iterable	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Array.prototype.includes	es2016.array	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	SharedArrayBuffer	es2017.sharedmemory	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
	Atomics	es2017.typedarrays	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
	Uint8Array	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Uint8ClampedArray	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Int16Array	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Uint16Array	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Int32Array	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Uint32Array	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Float32Array	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Float64Array	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Int8Array	es2017.typedarrays	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Intl.DateTimeFormat::formatToParts(date)	es2017.intl	✅	✅	❌	❌	❌	❌	✅	✅	✅	❌	✅	❌	❌	❌	❌	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Object.getOwnPropertyDescriptors(obj)	es2017.object	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Object.values(obj)	es2017.object	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Object.entries(obj)	es2017.object	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	String.prototype.padEnd	es2017.string	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	String.prototype.padStart	es2017.string	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	async function* () { ... }	es2018.asyncgenerator	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️
	for await (let value of range) { ... }	es2018.asynciterable	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️
	Symbol.asyncIterator	es2018.asynciterable	✅	✅	✅	✅	❌	❌	❌	❌	❌	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Intl.PluralRules	es2018.intl	✅	✅	❌	❌	❌	❌	❌	❌	❌	✅	✅	❌	❌	❌	❌	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	RegExp.dotAll	es2018.regexp	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Promise.prototype.finally	es2018.promise	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Array.prototype.flat	es2019.array	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Array.prototype.flatMap	es2019.array	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Object.fromEntries	es2019.object	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	String.prototype.trimEnd	es2019.string	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	String.prototype.trimStart	es2019.string	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	String.prototype.trimLeft	es2019.string	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	String.prototype.trimRight	es2019.string	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Symbol.prototype.description	es2019.symbol	✅	✅	✅	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	BigInt	es2020.bigint	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅	✅	✅	✅	✅	✅	✅
	BigInt64Array	es2020.bigint	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅
	BigUint64Array	es2020.bigint	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅
	Promise.allSettled()	es2020.promise	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
	str.matchAll(/regex/g)	es2020.string	✅	✅	✅	✅	❌	✅	✅	✅	✅	❌	✅	❌	✅	❌	❌	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Symbol.matchAll	es2020.symbol.wellknown	✅	✅	✅	✅	❌	✅	✅	✅	✅	❌	✅	❌	✅	❌	❌	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	Promise.any()	es2021.promise	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
	String.prototype.replaceAll	es2021.string	✅	✅	✅	✅	❌	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
	WeakRef	es2021.weakref	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅	✅
	Intl.ListFormat	es2021.intl	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅	✅
	Intl.ListFormat.supportedLocalesOf	es2021.intl	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅	✅
	Array.prototype.at	es2022.array	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
	String.prototype.at	es2022.string	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
	AggregateError	es2022.error	✅	✅	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅	✅	✅	✅	✅	✅	✅
	Atomics.waitAsync	es2022.sharedmemory	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
	Object.hasOwn	es2022.object	✅	✅	✅	✅	❌	❌	❌	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
	Intl.Segmenter	es2022.intl	✅	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	✅	✅	✅