TypeScript Weekly

Issue #149 — September 2, 2020

Announcing TypeScript 4.0

TypeScript 4.0 has been released and brings some exciting new features, including variadic tuple types, labeled tuple elements, the new assignment operators &&=, ||=, and ??=, and more. Although it is a major release, there are no major breaking changes.

Daniel Rosenwasser

this in JavaScript and TypeScript

This post explains how the this keyword works in JavaScript and how TypeScript can help you understand what this refers to.

Stefan Baumgartner

Template String Types and Mapped Type `as` Clauses

Anders Hejlsberg has been working on interesting new type system capabilities: template string types as well as mapped type as clauses. Both features are slated for the upcoming TypeScript 4.1 release.

Anders Hejlsberg

Recursive Conditional Types

Another pull request by Anders Hejlsberg that adds support for recursive conditional types to TypeScript. Up until now, conditional types were restricted to be non-recursive.

Anders Hejlsberg

TypeScript Support in Svelte

How to use TypeScript in Svelte applications: all the way from configuring the project to migrating it from JavaScript to TypeScript.

MDN