Implementation status tracking

[rkirsling]

JSC: https://bugs.webkit.org/show_bug.cgi?id=200199

V8: https://bugs.chromium.org/p/v8/issues/detail?id=9553

SM: https://bugzilla.mozilla.org/show_bug.cgi?id=1566143

[MatthiasKunnen]

TypeScript: microsoft/TypeScript#16

[devsnek]

wow that is an old feature request for typescript 😅

[devsnek]

Initial implementation of optional chaining has landed in V8 behind --harmony-optional-chaining (v8/v8@ceb7bd5)

[devsnek]

Initial implementation of optional chaining has landed in engine262 behind --features=OptionalChaining (engine262/engine262@e4c6798)

[rkirsling]

Landed in JSC (behind feature flag) in WebKit/WebKit@2af340f (https://trac.webkit.org/r248829).

[MatthiasKunnen]

Landed in TypeScript 3.7

• https://devblogs.microsoft.com/typescript/announcing-typescript-3-7/
• https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html

[rkirsling]

This is now on by default in JSC (will likely be available in STP 97).

[robpalme]

V8 unflagged on master on 2019-11-01 which makes it available in Chrome 80. You can try it using Chrome Canary.

[avp]

Landed in Hermes: facebook/hermes@f6577a4

[rhuanjl]

I've opened an issue on chakracore chakra-core/ChakraCore#6349 I may try and do the implementation in the next 2-3 weeks if no one else does.

[codehag]

landed today unflagged in Firefox nightly. You can expect it with firefox 74