Supported ECMAScript Version

[Xhanti]

Is there a table like this that tells someone which ECMAScript version this library support? I want to access if this will work for a project at work.

[koculu]

Topaz ECMAScript Compatibility:

ECMAScript 6 (ES2015)

Features	Supported	Alternative
Arrow Functions	✔
Classes	➖
Modules	➖	✔ use custom import from host
Template Strings	✔
Promises	➖	✔ use dotnet Task
let and const	✔
Destructuring Assignment	✔
Default Parameters	✔
Rest and Spread Operators	✔
Symbol Type	➖

ECMAScript 7 (ES2016)

Features	Supported	Alternative
Array.prototype.includes	✔
Exponentiation Operator	✔
Array.prototype.flat and Array.prototype.flatMap	✔

ECMAScript 8 (ES2017)

Features	Supported	Alternative
async/await	✔
Object.values and Object.entries	➖	✔ use dotnet Reflection
String padding	➖	✔ use dotnet string
Object.getOwnPropertyDescriptors	➖

ECMAScript 9 (ES2018)

Features	Supported	Alternative
Asynchronous Iteration	➖	✔ use await in normal loops
Rest/Spread Properties	✔
Promise.prototype.finally	➖	✔ use dotnet Task
Template Literal Revision (Tagged Templates)	✔

ECMAScript 10 (ES2019)

Features	Supported	Alternative
Array.prototype.flat and Array.prototype.flatMap (revision)	✔
Object.fromEntries	➖	✔ use dotnet Reflection
String trimming	➖	✔ use dotnet string
Optional Catch Binding	✔
Symbol.prototype.description	➖

ECMAScript 11 (ES2020)

Features	Supported	Alternative
BigInt	➖	✔ use dotnet BigInteger
Dynamic Import	➖	✔ use custom import from host
Optional Chaining Operator	✔
Nullish Coalescing Operator	✔
Promise.allSettled	➖	✔ use dotnet Task
GlobalThis	✔

ECMAScript 12 (ES2021)

Features	Supported	Alternative
String.prototype.replaceAll	➖	✔ use dotnet string
Logical Assignment Operators	✔
Numeric Separators	➖
Promise.any	➖	✔ use dotnet Task
WeakRefs	➖	✔ use dotnet WeakReference
Private Methods and Fields	➖
Logical Assignment Operators	✔

ECMAScript 13 (ES2022)

Features	Supported	Alternative
Top-level await	✔

[Xhanti]

Thank you

[uleelx]

How about "Proxies" (aka the global object "Proxy")?
For meta-programming, there is no alternative. This is important for code syntax improvements, or elegance. @koculu

[koculu]

There is no built-in Proxy object.
However, Proxy support can be implemented by creating a custom DefaultObjectProxy through TopazEngineSetup.