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title: What's new in Svelte: July 2021 description: Keeping cool with fixes, TypeScript tooling and tonnes of new features author: Daniel Sandoval authorURL: https://desandoval.net

As the northern hemisphere heats up, Svelte has stayed cool with lots of performance and bug fixes, better TypeScript support, and lots of new components & tools from around the ecosystem. Let's take a peek 👀

New in SvelteKit

  • adapter-node now precompresses assets using gzip & brotli (#1693)
  • Support for TypeScript transpilation has been added to the svelte-kit package tooling (#1633)
  • Improved caching defaults in adapter-node (#1416)
  • Allow configuring Rollup output options (#1572)
  • Fixed usage of SSL with HMR (#1517)

Features & bug fixes from around svelte/*

  • Svelte 3.38.3 (released June 22) includes a bunch of performance and bug fixes - including hydration optimizations, this preservation in bubbled events, and more!
  • The latest language tools releases added support for prop renaming from outside of a component, PostCSS syntax grammar, and a .d.ts output target in svelte2tsx which can be used to create type definitions from Svelte files.
  • Also in language tools, some long-awaited experimental features for enhanced TypeScript support were added - including explicitly typing all possible component events or slots, and using generics. Have a look at the RFC for more details and leave feedback in this issue if you are using it.
  • svelte-scroller got some quality-of-life fixes in 2.0.7 - fixing an initial width bug and updating its index more conservatively

Coming soon to Svelte

  • Constants in markup (RFC): Adds a new {@const ...} tag that defines a local constant (PR)

Community Showcase

Apps & Sites

  • SvelteThemes is a curated list of Svelte themes and templates built using svelte, sveltekit, elderjs, routify etc.
  • Beatbump is an alternative frontend for YouTube Music created using Svelte/SvelteKit.
  • Sveltuir is an app help you memorize the guitar fretboard

Educational Content

Libraries, Tools & Components

  • svelte-pipeline provides custom Javascript contexts and the Svelte Compiler as Svelte Stores, for REPLs, Editors, etc.
  • Sveltotron is an Electron-based app made to inspect your Svelte app
  • svelte-qr-reader-writer is a Svelte component that helps read and write data from QR codes
  • svelte-stack-router Aims to make Svelte apps feel more native by routing with Stacks
  • svelte-typed-context provides an interface which, when provided to getContext or setContext, allows for stricter types
  • svelte-modals is a simple, flexible, zero-dependency modal manager for Svelte

Want to contribute a component? Interested in helping make Svelte's presence on the web better? Submit a Component to the Svelte Society site by making a PR to this file or check out the list of open issues if you'd like to contribute to the Svelte Society rewrite in SvelteKit.

See you next month!

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