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This PR contains the following updates:
^3.52.0->^4.0.0Release Notes
sveltejs/svelte
### [`v4.0.0`](https://togithub.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#400) [Compare Source](https://togithub.com/sveltejs/svelte/compare/v3.59.2...svelte@4.0.0) ##### Major Changes - breaking: Minimum supported Node version is now Node 16 ([#8566](https://togithub.com/sveltejs/svelte/pull/8566)) - breaking: Minimum supported webpack version is now webpack 5 ([#8515](https://togithub.com/sveltejs/svelte/pull/8515)) - breaking: Bundlers must specify the `browser` condition when building a frontend bundle for the browser ([#8516](https://togithub.com/sveltejs/svelte/pull/8516)) - breaking: Minimum supported vite-plugin-svelte version is now 2.4.1. SvelteKit users can upgrade to 1.20.0 or newer to ensure a compatible version (\[[#8516](https://togithub.com/sveltejs/svelte/issues/8516)] [https://github.com/sveltejs/svelte/pull/8516](https://togithub.com/sveltejs/svelte/pull/8516)8516)) - breaking: Minimum supported `rollup-plugin-svelte` version is now 7.1.5 ([198dbcf](https://togithub.com/sveltejs/svelte/commit/198dbcf)) - breaking: Minimum supported `svelte-loader` is now 3.1.8 ([198dbcf](https://togithub.com/sveltejs/svelte/commit/198dbcf)) - breaking: Minimum supported TypeScript version is now TypeScript 5 (it will likely work with lower versions, but we make no guarantees about that) (\[[#8488](https://togithub.com/sveltejs/svelte/issues/8488)] [https://github.com/sveltejs/svelte/pull/8488](https://togithub.com/sveltejs/svelte/pull/8488)8488)) - breaking: Remove `svelte/register` hook, CJS runtime version and CJS compiler output ([#8613](https://togithub.com/sveltejs/svelte/pull/8613)) - breaking: Stricter types for `createEventDispatcher` (see PR for migration instructions) ([#7224](https://togithub.com/sveltejs/svelte/pull/7224)) - breaking: Stricter types for `Action` and `ActionReturn` (see PR for migration instructions) ([#7442](https://togithub.com/sveltejs/svelte/pull/7442)) - breaking: Stricter types for `onMount` - now throws a type error when returning a function asynchronously to catch potential mistakes around callback functions (see PR for migration instructions) ([#8136](https://togithub.com/sveltejs/svelte/pull/8136)) - breaking: Overhaul and drastically improve creating custom elements with Svelte (see PR for list of changes and migration instructions) (\[[#8457](https://togithub.com/sveltejs/svelte/issues/8457)]\(https://github. com/sveltejs/svelte/pull/8457)) - breaking: Deprecate `SvelteComponentTyped` in favor of `SvelteComponent` ([#8512](https://togithub.com/sveltejs/svelte/pull/8512)) - breaking: Make transitions local by default to prevent confusion around page navigations ([#6686](https://togithub.com/sveltejs/svelte/issues/6686)) - breaking: Error on falsy values instead of stores passed to `derived` ([#7947](https://togithub.com/sveltejs/svelte/pull/7947)) - breaking: Custom store implementers now need to pass an `update` function additionally to the `set` function (\[[#6750](https://togithub.com/sveltejs/svelte/issues/6750)]\(https://github.com/sveltejs/svelte/pull/ 6750\)) - breaking: Do not expose default slot bindings to named slots and vice versa ([#6049](https://togithub.com/sveltejs/svelte/pull/6049)) - breaking: Change order in which preprocessors are applied ([#8618](https://togithub.com/sveltejs/svelte/pull/8618)) - breaking: The runtime now makes use of `classList.toggle(name, boolean)` which does not work in very old browsers (\[[#8629](https://togithub.com/sveltejs/svelte/issues/8629)]\(https://github.com/sveltejs/svelte/ pull/8629)) - breaking: apply `inert` to outroing elements ([#8627](https://togithub.com/sveltejs/svelte/pull/8627)) - breaking: use `CustomEvent` constructor instead of deprecated `createEvent` method ([#8775](https://togithub.com/sveltejs/svelte/pull/8775)) ##### Minor Changes - Add a way to modify attributes for script/style preprocessors ([#8618](https://togithub.com/sveltejs/svelte/pull/8618)) - Improve hydration speed by adding `data-svelte-h` attribute to detect unchanged HTML elements ([#7426](https://togithub.com/sveltejs/svelte/pull/7426)) - Add `a11y no-noninteractive-element-interactions` rule ([#8391](https://togithub.com/sveltejs/svelte/pull/8391)) - Add `a11y-no-static-element-interactions`rule ([#8251](https://togithub.com/sveltejs/svelte/pull/8251)) - Allow `#each` to iterate over iterables like `Set`, `Map` etc ([#7425](https://togithub.com/sveltejs/svelte/issues/7425)) - Improve duplicate key error for keyed `each` blocks ([#8411](https://togithub.com/sveltejs/svelte/pull/8411)) - Warn about `:` in attributes and props to prevent ambiguity with Svelte directives ([#6823](https://togithub.com/sveltejs/svelte/issues/6823)) - feat: add version info to `window`. You can opt out by setting `discloseVersion` to `false` in the compiler options ([#8761](https://togithub.com/sveltejs/svelte/pull/8761)) - feat: smaller minified output for destructor chunks ([#8763](https://togithub.com/sveltejs/svelte/pull/8763)) ##### Patch Changes - Bind `null` option and input values consistently ([#8312](https://togithub.com/sveltejs/svelte/issues/8312)) - Allow `$store` to be used with changing values including nullish values ([#7555](https://togithub.com/sveltejs/svelte/issues/7555)) - Initialize stylesheet with `/* empty */` to enable setting CSP directive that also works in Safari ([#7800](https://togithub.com/sveltejs/svelte/pull/7800)) - Treat slots as if they don't exist when using CSS adjacent and general sibling combinators ([#8284](https://togithub.com/sveltejs/svelte/issues/8284)) - Fix transitions so that they don't require a `style-src 'unsafe-inline'` Content Security Policy (CSP) ([#6662](https://togithub.com/sveltejs/svelte/issues/6662)). - Explicitly disallow `var` declarations extending the reactive statement scope ([#6800](https://togithub.com/sveltejs/svelte/pull/6800)) - Improve error message when trying to use `animate:` directives on inline components ([#8641](https://togithub.com/sveltejs/svelte/issues/8641)) - fix: export ComponentType from `svelte` entrypoint ([#8578](https://togithub.com/sveltejs/svelte/pull/8578)) - fix: never use html optimization for mustache tags in hydration mode ([#8744](https://togithub.com/sveltejs/svelte/pull/8744)) - fix: derived store types ([#8578](https://togithub.com/sveltejs/svelte/pull/8578)) - Generate type declarations with dts-buddy ([#8578](https://togithub.com/sveltejs/svelte/pull/8578)) - fix: ensure types are loaded with all TS settings ([#8721](https://togithub.com/sveltejs/svelte/pull/8721)) - fix: account for preprocessor source maps when calculating meta info ([#8778](https://togithub.com/sveltejs/svelte/pull/8778)) - chore: deindent cjs output for compiler ([#8785](https://togithub.com/sveltejs/svelte/pull/8785)) - warn on boolean compilerOptions.css ([#8710](https://togithub.com/sveltejs/svelte/pull/8710)) - fix: export correct SvelteComponent type ([#8721](https://togithub.com/sveltejs/svelte/pull/8721))Configuration
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