The popular JavaScript transpiler now supports ECMAScript 2020 features by default with no plugins needed for nullish coalescing (??), optional chaining (?.) and dynamic import(). Work is also underway on Babel 8 with two upcoming issues outlined in this post too. 

.NET Core

• January 2020 Updates – 2.1.15, 3.0.2, and 3.1.1

• .NET Core 3.1.1 and .NET Core SDK 3.1.101( Release Notes | Download )

• .NET Core 3.0.2 and .NET Core SDK 3.0.102 ( Release Notes | Download )

• .NET Core 2.1.15 and .NET Core SDK 2.1.803 ( Release Notes | Download )

• Outstanding support for T4 templates is here with capabilities such as template execution, debugging, code highlighting, navigation, refactorings, code completion, and much more. 

• New responsive containers! Over a year in the making, fluid up to a particular breakpoint, available for all responsive tiers.
• New responsive .row-cols classes for quickly specifying the number of columns across breakpoints. This one is huge for those of you who have asked for responsive card decks. 

New Breaking Changes

Angular now compiles with Ivy by default. See Ivy compatibility section.

Typescript 3.4 and 3.5 are no longer supported. Please update to Typescript 3.6.

tslib is now listed as a peer dependency rather than a direct dependency. Users not using the CLI will need to manually install tslib via yarn add tslib or npm install tslib --save. 

Announcing TypeScript 3.7 RC 

Moments ago we published a new bugfix – please welcome ReSharper Ultimate 2019.2.3 . It delivers highly requested support for the .NET Core 3.0 release build, which was released earlier, for all the tools in the ReSharper Ultimate family! 

The main goal for this release is to add full support for the just-released .NET Core 3.0 for you to take advantage of. If you use top-notch technologies like the latest bits of .NET Core – install Rider 2019.2.3 and enjoy! 

Announcing TypeScript 3.7 Beta 

// Before
if (foo && foo.bar && foo.bar.baz) {
    // ...
}

// After-ish
if (foo?.bar?.baz) {
    // ...
}