# Announcing TypeScript 5.9 RC

DevFeed: [Announcing TypeScript 5.9 RC](<https://devfeed.tech/articles/announcing-typescript-5-9-rc-2916.md>)

Original publisher: [Read original article](<https://devblogs.microsoft.com/typescript/announcing-typescript-5-9-rc/>)

Author: Daniel Rosenwasser

Published: 2025-07-25T16:53:10Z

Content type: article

Language: en

Sources: [TypeScript](<https://devfeed.tech/sources/typescript.md>)

Topics: [TypeScript](<https://devfeed.tech/topics/typescript.md>), [ECMAScript](<https://devfeed.tech/topics/ecmascript.md>), [npm](<https://devfeed.tech/topics/npm.md>)

Tags: [compiler](<https://devfeed.tech/tags/compiler.md>), [dependencies](<https://devfeed.tech/tags/dependencies.md>), [developers](<https://devfeed.tech/tags/developers.md>), [features](<https://devfeed.tech/tags/features.md>), [npm](<https://devfeed.tech/tags/npm.md>), [release](<https://devfeed.tech/tags/release.md>), [typescript](<https://devfeed.tech/tags/typescript.md>)

## AI overview

This article announces the Release Candidate of TypeScript 5.9. It describes changes to the generated tsconfig configuration and introduces support for ECMAScript deferred module evaluation through import defer.

## Source excerpt

Today we are excited to announce the Release Candidate (RC) of TypeScript 5.9! To get started using the Release Candidate, you can get it through npm with the following command: npm install -D typescript@rc Let's take a look at what's new in TypeScript 5.9! Minimal and Updated tsc --init Support for import defer Support for [...] The post Announcing TypeScript 5.9 RC appeared first on TypeScript.