Typescript Update

Version 3.6

Announcement / Release Note)

• More Accurate Array Spread

Version 3.7

Announcement / Release Note)

• ES2020
  • Optional Chaining (let x = foo?.bar.baz();)
  • Nullish Coalescing operator (let x = foo ?? bar();)
• better handling of JS & d.ts generation (--declaration and --allowJs)
• Recursive Type Aliases
• Uncalled Function Checks (e.g. user user.isAdministrator instead of user.isAdministrator())
• Flatter Error Reporting

Version 3.8

Announcement / Release Note)

• Type-Only Imports and Exports (import type { SomeThing } from "./some-module.js"; export type { SomeThing };)
• ES2020
  • ECMAScript Private Fields (⚠️ Use WeakMaps / only supported by Chromium + Safari 14.1 (~ 70%))

Version 4.0

Announcement / Release Note)

Breaking changes : 4.0.0 & 4.0.1

• this inside a module isn't treated as a globalThis anymore (see Inside of modules, this should be undefined #35882)
• props deletion now invalidate the associated interface (see deleting a prop doesn't invalidate the interface #13783)