Lots of new features this month, from both Svelte and Sapper! In this monthly post, you'll find new features, bug fixes, and a showcase of Svelte projects from around the community. _We know it's been a while since we posted a new blog post... there will be lots more soon, starting with this monthly series!_
## New features
1. `use:obj.method` allows functions defined within objects to be used within actions ([Example](https://svelte.dev/repl/c305722adb4a4545b27b198ea8ff9bde?version=3.26.0), **3.26.0**)
2. `_` is now supported as a "numerical seperator", similar to a `.` or `,` ([Example](https://svelte.dev/repl/6612cec5c50b44cbab7f4a64ff930153?version=3.26.0), **3.26.0**)
1. `use:obj.method` allows functions defined within objects to be used within actions ([Example](https://svelte.dev/repl/c305722adb4a4545b27b198ea8ff9bde?version=3.27.0), **3.26.0**, warning removed in **3.27.0**)
2. `_` is now supported as a "numerical seperator", similar to a `.` or `,` ([Example](https://svelte.dev/repl/844c39e91d1248649fe54af839fab570?version=3.26.0), **3.26.0**)
3. `import.meta` now works in template expressions ([Example](https://svelte.dev/repl/9630de41957a4c80a4fce264360a6bc7?version=3.26.0), **3.26.0**)
4. CSS Selectors with `~` and `+` combinators are now supported ([Example](https://svelte.dev/repl/91ad9257d2d1430185a504a18cc60172?version=3.29.0), **3.27.0**, with a compiler fix in **3.29.0**)
5. The `{#key}` block is now available to key arbitrary content on an expression ([More info](https://github.com/sveltejs/svelte/issues/1469), **3.29.0**)
6. Slots can now be forwarded through child components! This used to only be possible by adding extra wrapper `<div>`s ([More info](https://github.com/sveltejs/svelte/issues/2079), **3.29.0**)
**New from Sapper!**
Sapper 0.28.9 just came out. The highlights from it include much better support for CSP nonces, asset preload support for exported pages, and error details are now available in the $page store on error pages.
In addition, Sapper's CSS handling has been rewritten over the course of recent releases in order to fix existing CSS handling bugs, refactor the CSS handling to occur entirely within a Rollup plugin, and remove the need internally to register CSS in the routing system. Congrats and thank you to the folks working on Sapper for all their solid work!
These last two updates come from an update to Svelte’s upstream dependency, [acorn](https://github.com/acornjs/acorn). Acorn generates Svelte’s Abstract Syntax Tree (AST) and is explained in detail [here](https://github.com/sveltejs/svelte/issues/1011#issuecomment-351262252)!
_If you're interested in contributing to Sapper, [check out these "good first issue"s](https://github.com/sveltejs/sapper/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)!_
## Impactful bug fixes
1. CSS compilation will no longer remove rules for the `open` attribute on `<details>` elements ([Example](https://svelte.dev/repl/ab4c0c177d1f4fab92f46eb8539cea9a?version=3.26.0), **3.26.0**)
- CSS compilation will no longer remove rules for the `open` attribute on `<details>` elements ([Example](https://svelte.dev/repl/ab4c0c177d1f4fab92f46eb8539cea9a?version=3.26.0), **3.26.0**)
## Coming up
- Anything coming down the pipe???
- [Svelte Summit](https://sveltesummit.com/) is taking place on October 18!
See the [CHANGELOG](https://github.com/sveltejs/svelte/blob/master/CHANGELOG.md) for a full list of features and bugfixes.
For all the features and bugfixes see the CHANGELOG for [Svelte](https://github.com/sveltejs/svelte/blob/master/CHANGELOG.md) and [Sapper](https://github.com/sveltejs/sapper/blob/master/CHANGELOG.md).
---
@ -33,7 +43,8 @@ See the [CHANGELOG](https://github.com/sveltejs/svelte/blob/master/CHANGELOG.md)
#### In-depth learning:
- [Svelte 3 Up and Running](https://www.amazon.com/dp/B08D6T6BKS/ref=cm_sw_r_tw_dp_x_OQMtFb3GPQCB2) is a new book about building production-ready static web apps with Svelte 3
- [Sapper Tutorial (Crash Course)](https://www.youtube.com/playlist?list=PL4cUxeGkcC9gdr4Qhx83gBBcID-KMe-PQ) walks through the ins-and-outs of Sapper, the Svelte-powered applicaiton framework
- [Sapper Tutorial (Crash Course)](https://www.youtube.com/playlist?list=PL4cUxeGkcC9gdr4Qhx83gBBcID-KMe-PQ) walks through the ins-and-outs of Sapper, the Svelte-powered application framework
- [Svelte Society Day France](https://france.sveltesociety.dev/) happened September 27th featuring a wide variety of topics all in French! You can find the full recording [here](https://www.youtube.com/watch?v=aS1TQ155JK4).
#### Plug-and-play components:
- [svelte-zoom](https://github.com/vaheqelyan/svelte-zoom) brings "nearly native" pan-and-zoom to images on desktop and mobile
@ -42,7 +53,6 @@ See the [CHANGELOG](https://github.com/sveltejs/svelte/blob/master/CHANGELOG.md)
- [This Tilt component](https://svelte.dev/repl/7b23ad9d2693424482cd411b0378b55b?version=3.24.1) implements a common UX pattern where the hovered element tilts to follow the mouse
#### Lots of examples of how use JS tech came out this month:
@ -52,7 +62,7 @@ See the [CHANGELOG](https://github.com/sveltejs/svelte/blob/master/CHANGELOG.md)
**Reminder**: There's a [Svelte integrations repo](https://github.com/sveltejs/integrations) that demonstrates ways to incorporate Svelte into your stack (and vice versa). If you've got questions on how to use a particular piece of tech with Svelte, you may find your answer there... and if you've gotten something to work with Svelte, consider contributing!
For more amazing Svelte projects, check out the [Svelte Community showcase](https://svelte-community.netlify.app/showcase/), [Reddit](https://www.reddit.com/r/sveltejs/) and [Discord](https://discord.com/invite/yy75DKs)… and be sure to post your own!
For more amazing Svelte projects, check out the [Svelte Society](https://sveltesociety.dev/), [Reddit](https://www.reddit.com/r/sveltejs/) and [Discord](https://discord.com/invite/yy75DKs)… and be sure to post your own!
Daniel Sandoval
5 years ago
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GitHub