NativeScript ES2016+ compatibility table

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NativeScript V8 JavaScriptCore
⬤ Minor difference (1 point) ⬤ Small feature (2 points) ⬤ Medium feature (4 points) ⬤ Large feature (8 points)

			NativeScript						Desktop browsers
Feature name	Current browser		NS 6.5 Android v8	NS 7.0 Android v8	NS 8.0 Android v8	NS 6.5 iOS JSC	NS 7.0 iOS v8	NS 8.0 iOS v8	CH 89	CH 90	SF 14 Beta	SF TP
2016 features
§exponentiation (**) operator	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3
§basic support	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§assignment	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§early syntax error for unary negation without parens	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Array.prototype.includes	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3
§Array.prototype.includes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Array.prototype.includes is generic	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§%TypedArray%.prototype.includes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
2016 misc
§generator functions can't be used with "new" ^[1]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§generator throw() caught by inner generator ^[2]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§strict fn w/ non-strict non-simple params is error ^[3]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§nested rest destructuring, declarations ^[4]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§nested rest destructuring, parameters ^[5]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Proxy, "enumerate" handler removed ^[6]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Proxy internal calls, Array.prototype.includes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
2017 features
§Object static methods	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4
§Object.values	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Object.entries	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Object.getOwnPropertyDescriptors	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Object.getOwnPropertyDescriptors doesn't provide undefined descriptors	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§String padding	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2
§String.prototype.padStart	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§String.prototype.padEnd	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§trailing commas in function syntax	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2
§in parameter lists	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§in argument lists	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§async functions	16/16	16/16	16/16	16/16	16/16	16/16	16/16	16/16	16/16	16/16
§return	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§throw	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§no line break between async and function	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§no "prototype" property	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§await	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§await, rejection	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§must await a value	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§can await non-Promise values	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§cannot await in parameters	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§async methods, object literals	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§async methods, classes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§async arrow functions in methods, classes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§async arrow functions	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§correct prototype chain	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§async function prototype, Symbol.toStringTag	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§async function constructor	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§shared memory and atomics	17/17	17/17	17/17	0/17	17/17	16/17	17/17	17/17	0/17	0/17
§SharedArrayBuffer	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§SharedArrayBuffer[Symbol.species]	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§SharedArrayBuffer.prototype.byteLength	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§SharedArrayBuffer.prototype.slice	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§SharedArrayBuffer.prototype[Symbol.toStringTag]	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.add	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.and	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.compareExchange	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.exchange	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.wait	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.wake	Yes	Yes	Yes	No	Yes	No	Yes	Yes	No^[7]	No^[7]
§Atomics.isLockFree	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.load	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.or	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.store	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.sub	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
§Atomics.xor	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No^[7]	No^[7]
2017 misc
§RegExp "u" flag, case folding	No	No	No	Yes	No	No	Yes	Yes	Yes	Yes
§arguments.caller removed	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
2017 annex b
§Object.prototype getter/setter methods	16/16	16/16	16/16	16/16	16/16	16/16	16/16	16/16	16/16	16/16
§__defineGetter__	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__defineGetter__, symbols	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__defineGetter__, ToObject(this)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__defineSetter__	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__defineSetter__, symbols	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__defineSetter__, ToObject(this)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupGetter__	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupGetter__, prototype chain	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupGetter__, symbols	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupGetter__, ToObject(this)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupGetter__, data properties can shadow accessors	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupSetter__	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupSetter__, prototype chain	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupSetter__, symbols	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupSetter__, ToObject(this)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupSetter__, data properties can shadow accessors	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Proxy internal calls, getter/setter methods	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4
§__defineGetter__	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__defineSetter__	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupGetter__	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§__lookupSetter__	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§assignments allowed in for-in head in non-strict mode	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
2018 features
§object rest/spread properties	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2
§object rest properties	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§object spread properties	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Promise.prototype.finally	3/3	3/3	3/3	3/3	2/3	3/3	3/3	3/3	3/3	3/3
§basic support	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§don't change resolution value	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§change rejection value	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes
§s (dotAll) flag for regular expressions	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§RegExp named capture groups	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§RegExp Lookbehind Assertions	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No	No
§RegExp Unicode Property Escapes	No	No	No	Yes	No	No	Yes	Yes	Yes	Yes
§Asynchronous Iterators	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2
§async generators	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§for-await-of loops	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
2018 misc
§Proxy "ownKeys" handler, duplicate keys for non-extensible targets	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§template literal revision	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
2019 features
§Object.fromEntries	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§string trimming	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4	4/4
§String.prototype.trimLeft	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§String.prototype.trimRight	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§String.prototype.trimStart	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§String.prototype.trimEnd	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Array.prototype.{flat, flatMap}^[8]	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3
§Array.prototype.flat	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Array.prototype.flatMap	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§flat and flatMap in Array.prototype[@@unscopables]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
2019 misc
§optional catch binding	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3
§basic	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§await	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§yield	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Symbol.prototype.description	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3	3/3
§basic	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§empty description	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§undefined description	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Function.prototype.toString revision	7/7	7/7	7/7	4/7	7/7	7/7	7/7	7/7	4/7	4/7
§functions created with the Function constructor	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	?	?
§arrows	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§[native code]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§class expression with implicit constructor	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§class expression with explicit constructor	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§unicode escape sequences in identifiers	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	?	?
§methods and computed property names	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	?	?
§JSON superset	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2
§LINE SEPARATOR can appear in string literals	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§PARAGRAPH SEPARATOR can appear in string literals	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§Well-formed JSON.stringify	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
2020 features
§String.prototype.matchAll	2/2	2/2	2/2	1/2	2/2	2/2	2/2	2/2	2/2	2/2
§basic functionality	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§throws on non-global regex	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§BigInt	8/8	8/8	8/8	0/8	8/8	8/8	8/8	8/8	4/8	8/8
§basic functionality	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§constructor	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§BigInt.asUintN	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§BigInt.asIntN	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§BigInt64Array	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	?	Yes
§BigUint64Array	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	?	Yes
§DataView.prototype.getBigInt64	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	?	Yes
§DataView.prototype.getBigUint64	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	?	Yes
§Promise.allSettled	?	?	?	?	?	?	Yes	Yes	Yes	Yes
§globalThis	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2
§"globalThis" global property is global object	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§"globalThis" global property has correct property descriptor	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
§optional chaining operator (?.)	4/5	4/5	4/5	0/5	4/5	4/5	4/5	4/5	5/5	5/5
§optional property access	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§optional bracket access	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§optional method call	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§optional function call	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
§spread parameters after optional chaining	No	No	No	No	No	No	No	No	Yes	Yes
§nullish coalescing operator (??)	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
2021 features
§String.prototype.replaceAll	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§Promise.any	0/2	0/2	0/2	0/2	0/2	2/2	2/2	2/2	2/2	2/2
§fulfillment	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§AggregateError	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§WeakReferences	0/2	0/2	0/2	0/2	2/2	2/2	2/2	2/2	2/2	2/2
§WeakRef minimal support	No	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes
§FinalizationRegistry minimal support	No	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes
§Logical Assignment	0/9	0/9	0/9	0/9	0/9	9/9	9/9	9/9	9/9	9/9
§\|\|= basic support	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§\|\|= short-circuiting behaviour	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§\|\|= setter not unecessarily invoked	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§&&= basic support	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§&&= short-circuiting behaviour	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§&&= setter not unecessarily invoked	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§??= basic support	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§??= short-circuiting behaviour	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§??= setter not unecessarily invoked	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
§numeric separators	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

Thanks to Kangax, webspacedspace, zloirock and the rest of the people who contributed to Kangax ES Compatibility Table

This site uses the base of the awesome compat-table and adds all the code to handle the additional testing on the NativeScript runtimes, and ability to export the data and collate it back to these tables...

^[1] TC39 meeting notes from July 28, 2015.

^[2] 'Semantics of yield* in throw case' GitHub issue in ECMA-262 repo.

^[3] TC39 meeting notes from July 29, 2015.

^[4] TC39 meeting notes from July 28, 2015.

^[5] TC39 meeting notes from July 28, 2015.

^[6] 'Normative: Remove [[Enumerate]] and associated reflective capabilities' GitHub Pull Request in ECMA-262 repo.

^[7] The feature was temporarily disabled to mitigate the Meltdown and Spectre CPU bugs.

^[8] Name of Array.prototype.flatten() changed to Array.prototype.flat() due to web compatibility issues.