2540 Commits (svelte@5.55.2)

Author	SHA1	Message	Date
github-actions[bot]	2e29c87cc9	Version Packages (#18036) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.55.2 ### Patch Changes - fix: invalidate `@const` tags based on visible references in legacy mode ([#18041](https://github.com/sveltejs/svelte/pull/18041)) - fix: handle parens in template expressions more robustly ([#18075](https://github.com/sveltejs/svelte/pull/18075)) - fix: disallow `--` in `idPrefix` ([#18038](https://github.com/sveltejs/svelte/pull/18038)) - fix: correct types for `ontoggle` on `<details>` elements ([#18063](https://github.com/sveltejs/svelte/pull/18063)) - fix: don't override `$destroy/set/on` instance methods in dev mode ([#18034](https://github.com/sveltejs/svelte/pull/18034)) - fix: unskip branches of earlier batches after commit ([#18048](https://github.com/sveltejs/svelte/pull/18048)) - fix: never set derived.v inside fork ([#18037](https://github.com/sveltejs/svelte/pull/18037)) - fix: skip rebase logic in non-async mode ([#18040](https://github.com/sveltejs/svelte/pull/18040)) - fix: don't reset status of uninitialized deriveds ([#18054](https://github.com/sveltejs/svelte/pull/18054)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	2 weeks ago
Rich Harris	8966601dcd	fix: handle parens in template expressions more robustly (#18075) ... While looking into #17954 I realised that a) our code for handling parentheses in expressions is unnecessarily convoluted and b) it doesn't handle the case where you have an opening parent outside the first comment — this fails to parse: ```svelte {(/**/ 42)} ``` This fixes it and simplifies the code a good bit. ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint`	2 weeks ago
Simon H	0395ef0df7	fix: unskip branches of earlier batches after commit (#18048) ... Fixes #17571 where the situation is the following: A derived creates a new query. That query initializes loading with true. This means the if block is marked for destruction (therefore effects inside branch are skipped), but it's not doing that yet because the query promise is pending. Then query resolves and loading is set back to false right before resolving, but it's not the same tick so `loading=false` is a separate thing. Because that later batch doesn't see any overlap with an earlier batch (the earlier batch did set loading to true but not via set but indirectly via recreating the query) it doesn't wait on it and flushes right away. Now the if block is marked as visible again but the earlier batch doesn't know that if noone unskips its branch. If we don't do that the render effect that is now dirty as part of that batch will not run.	2 weeks ago
Rich Harris	cd5bda00a8	chore: fix changeset (#18073) ... prevents the changelog from getting borked up	2 weeks ago
Simon H	d86cb5cc32	fix: skip rebase logic in non-async mode (#18040) ... Fixes part of #17940 (the hydration->error thing still needs a repro). Essentially in sync mode render effects are executed during traversing the effect tree, and when flushSync is called during that it can cause the timing of things getting out of sync such that you end up wanting to rebase another branch, which is never needed in sync mode. So we just skip that logic in sync mode. Another way would be to adjust flushSync such that it does appends itself to the end of the current flushing cycle if it notices processing is already ongoing. This will not work when you pass a callback function to `flushSync` though - another indicator that we should probably remove that callback argument. --------- Co-authored-by: Rich Harris <rich.harris@vercel.com> Co-authored-by: Rich Harris <hello@rich-harris.dev>	2 weeks ago
Simon H	adba758067	fix: don't reset status of uninitialized deriveds (#18054) ... If a new branch is created (e.g. if block becomes truthy) inside a fork and a derived is read inside the new branch for the first time, it will get reactions but its true value will stay uninitialized due to the fork. If the fork then commits, it will NOT change its value because it will not reexecute: there is no effect running after commit telling it to do that, because it was only read inside new effects which already ran while still inside the fork. Now, when that branch is removed (e.g. if block becomes falsy), the derived loses its reactions again and becomes disconnected, at which point the status is reset. So we end up with a maybe_dirty or clean derived and an uninitialized value, causing breakage if it's called again afterwards. The fix is to not reset the status in this case. Fixes https://github.com/sveltejs/kit/issues/15126 Fixes https://github.com/sveltejs/kit/issues/15318 Fixes https://github.com/sveltejs/kit/issues/15061	2 weeks ago
ottomated	14adb8caa9	fix: correct types for `ontoggle` on <details> elements (#18063) ... `<details>` elements fire `ontoggle` as ToggleEvents ([source](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/toggle_event)), but they're currently just typed as Event. ### Before submitting the PR, please make sure you do the following - [ ] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [ ] This message body should clearly illustrate what problems it solves. - [ ] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint`	2 weeks ago
Rich Harris	c93e251654	fix: never set derived.v inside fork (#18037) ... This started out as me implementing https://github.com/sveltejs/svelte/pull/17998/changes#r3018047965, but then I realised that I'd also fixed the bug that #17998 addresses. So I guess it's an alternative to that PR --------- Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>	2 weeks ago
Rich Harris	edcbb0e640	fix: invalidate `@const` tags based on visible references in legacy mode (#18041) ... closes #17992	3 weeks ago
Rich Harris	ff3495dc05	fix: disallow `--` in `idPrefix` (#18038) ... supersedes #17993	3 weeks ago
Simon H	97d45f85c6	fix: don't override `$destroy/set/on` instance methods in dev mode (#18034) ... Don't think we need a test for this Fixes #17988	3 weeks ago
github-actions[bot]	37ab33c0a3	Version Packages (#18006) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.55.1 ### Patch Changes - fix: correctly handle bindings on the server ([#18009](https://github.com/sveltejs/svelte/pull/18009)) - fix: prevent hydration error on async `{@html ...}` ([#17999](https://github.com/sveltejs/svelte/pull/17999)) - fix: cleanup `superTypeParameters` in `ClassDeclarations`/`ClassExpression` ([#18015](https://github.com/sveltejs/svelte/pull/18015)) - fix: improve duplicate module import error message ([#18016](https://github.com/sveltejs/svelte/pull/18016)) - fix: reschedule new effects in prior batches ([#18021](https://github.com/sveltejs/svelte/pull/18021)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	3 weeks ago
Rohit Nair P	4879f9da99	fix: improve duplicate module import error message (#18016) ... ## Description **While investigating the compiler analysis phase for errors or missing lines, I located an explicit `TODO fix the message here` comment in the source code (`packages/svelte/src/compiler/phases/2-analyze/visitors/shared/utils.js`).** ### Triggering Code ```svelte <script module> import { foo } from './somewhere.js'; </script> <script> let foo = 'conflict'; // Triggers the duplicate module import error </script> ``` ## The Bug When a component author creates a local `let` declaration in the instance `<script>` block that shadows a variable imported in the `<script module>` block, the compiler emits a `declaration_duplicate_module_import` error. However, the error message text was misleading. It stated: ```diff - Cannot declare a variable with the same name as an import inside `<script module>` + Cannot declare a variable with the same name as an import from `<script module>` ``` This incorrectly implies that the duplicate declaration itself is happening *inside* the module script block, rather than colliding with an import *from* that block. ## Changes Made | Action | Target (File / Function) | Description | | :--- | :--- | :--- | | **Template Fix** | `packages/svelte/messages/compile-errors/script.md` | Changed "inside" to "from" to accurately reflect the nature of the shadow collision. | | **Regenerated Errors** | `packages/svelte/src/compiler/errors.js` | Ran `pnpm generate` to apply the updated markdown template into the dictionary list. | | **Removed TODO** | `ensure_no_module_import_conflict` function | Removed the original `// TODO fix the message here` notation from the validator. | | **Test Adjustments** | `illegal-variable-declaration/errors.json` | Updated the validator test suite snapshots to assert against the correct error message format. | ## Validation Results * The error correctly throws when a user replicates this component structure. * Vitest suite `tests/validator/test.ts` successfully asserts the new, clearer message. --- ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint` # THANK YOU	3 weeks ago
Simon H	04eadbc8a9	fix: correctly handle bindings on the server (#18009) ... `item.subsume(item)` did nothing, honestly kinda weird how this only turned up now Fixes #17981	3 weeks ago
Paolo Ricciuti	957f2755fa	fix: cleanup `superTypeParameters` in `ClassDeclarations`/`ClassExpression` (#18015) ... Closes #18012 We were removing `superTypeArguments` but the AST showed `superTypeParameters`. Luckily, I was able to pinpoint `esrap@2.2.4` as the cause... I've only bumped `esrap` and that made the test fail (so that I could fix it) And of course it was that...there's literally a commit that explicitly print them lol f9137c4101	3 weeks ago
Simon H	a9d8439ad1	fix: reschedule new effects in prior batches (#18021) ... If a batch creates a new branch (e.g. through an if block becoming true) the previous batches so far do not know about the new effects created through that. This can lead to stale values being shown. We therefore schedule those new effects on prior batches if they are touched by a `current` value of that batch Fixes #17099 extracted from #17971	3 weeks ago
Simon H	669f6b45a3	fix: prevent hydration error on async `{@html ...}` (#17999) ... Fixes #17981	4 weeks ago
github-actions[bot]	6e52f40d41	Version Packages (#17984) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.55.0 ### Minor Changes - feat: export TweenOptions, SpringOptions, SpringUpdateOptions and Updater from svelte/motion ([#17967](https://github.com/sveltejs/svelte/pull/17967)) ### Patch Changes - fix: ensure HMR wrapper forwards correct start/end nodes to active effect ([#17985](https://github.com/sveltejs/svelte/pull/17985)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	4 weeks ago
Simon H	1773cb5b59	fix: ensure HMR wrapper forwards correct start/end nodes to active effect (#17985) ... Fixes #17982 (two issues reported there) Adding the start/end statically at the end once does not work because it's going to be stale when there's a HMR reload of the wrapped component. For reasons not completely clear to me it also fails in another case. So instead of wrapping the HMR with comments we just forward the nodes of the inner effect to the outer active effect, pretending the wrapper isn't there from a "remove dom nodes"-perspective.	4 weeks ago
moaaz	a94924b677	fix: export TweenOptions, SpringOptions, SpringUpdateOptions and Updater from svelte/motion (#17967) ... Exports `TweenedOptions`, `SpringOpts`, `SpringUpdateOpts`, and `Updater` from `svelte/motion`. These types are required for the public method signatures of `spring` and `tweened` (e.g., as parameters for `.set()` and `.update()`). This PR makes them accessible to TypeScript users, following the established pattern in modules like `svelte/store` and `svelte/transition`. Internal implementation details like `TickContext` remain private as they do not appear in any public-facing signatures. Fixes #16151 ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint` --------- Co-authored-by: Rich Harris <rich.harris@vercel.com> Co-authored-by: Rich Harris <hello@rich-harris.dev>	4 weeks ago
github-actions[bot]	db69b7e345	Version Packages (#17965) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.54.1 ### Patch Changes - fix: hydration comments during hmr ([#17975](https://github.com/sveltejs/svelte/pull/17975)) - fix: null out `effect.b` in `destroy_effect` ([#17980](https://github.com/sveltejs/svelte/pull/17980)) - fix: group sync statements ([#17977](https://github.com/sveltejs/svelte/pull/17977)) - fix: defer batch resolution until earlier intersecting batches have committed ([#17162](https://github.com/sveltejs/svelte/pull/17162)) - fix: properly invoke `iterator.return()` during reactivity loss check ([#17966](https://github.com/sveltejs/svelte/pull/17966)) - fix: remove trailing semicolon from {@const} tag printer ([#17962](https://github.com/sveltejs/svelte/pull/17962)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	4 weeks ago
Abishek Raj R R	7123bf3a13	fix: remove trailing semicolon from {@const} tag printer (#17962) ... Fixes #17720 ## Problem The `{@const}` tag was being printed with a trailing semicolon, producing invalid Svelte syntax like: {@const a = 1;} This happened because the `ConstTag` visitor in the printer was delegating to esrap's `VariableDeclaration` handler, which always appends a semicolon (correct for JS, but wrong for Svelte template syntax). ## Solution Instead of delegating to `VariableDeclaration`, the `ConstTag` visitor now manually prints the tag by: - Writing `{@const ` directly - Iterating through declarators and visiting each one - Separating multiple declarations with commas - Closing with `}` — no trailing semicolon ## Before {@const a = 1;} {@const a = 1, b = 2;} ## After {@const a = 1} {@const a = 1, b = 2} ## Changes - `packages/svelte/src/compiler/print/index.js` — fixed `ConstTag` visitor - `packages/svelte/tests/print/samples/const-tag/output.svelte` — updated expected test output --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> Co-authored-by: Rich Harris <hello@rich-harris.dev> Co-authored-by: Rich Harris <rich.harris@vercel.com>	4 weeks ago
Nitin Sahu	8e4de9b145	fix: null out effect.b in destroy_effect to prevent memory leak (#17980) ... ## Fix: #17881 ### Root Cause When a dynamic component switches (e.g. `<Component />`), branch effects are destroyed via `destroy_effect()`. However, the `effect.b` (Boundary reference) field was not cleared alongside other references (`next`, `prev`, `ctx`, `deps`, `fn`, `nodes`, `ac`). As a result, destroyed effects retained a reference to the `Boundary` instance, which holds references to component state and child effects. This prevented destroyed component subtrees from being garbage collected, causing memory usage to grow during repeated component switching. ### Solution Clear the boundary reference during effect destruction. ```diff effect.next = effect.prev = effect.teardown = effect.ctx = effect.deps = effect.fn = effect.nodes = effect.ac = + effect.b = null; ``` ### Test Plan * All existing tests pass: * runtime-runes: 2,459 * runtime-legacy: 3,294 * signals: 96 * Total: 5,849 tests * Added a dynamic component switching test that toggles components repeatedly and verifies correct DOM output. ### Validation Reproduced the issue using the example from #17881. After applying the fix: * Memory usage stabilizes during repeated component switching * Destroyed components are properly reclaimed by the garbage collector * No behavioral regressions observed ### Impact * Fixes memory leak in dynamic component switching * Minimal, safe change * No API or behavior changes --------- Co-authored-by: Rich Harris <rich.harris@vercel.com>	4 weeks ago
Simon H	6b33dd2a1e	fix: group sync statements (#17977) ... We were just putting each statement into its own promise. Besides this being bad for perf, it also introduces subtle timing issues - the execution order of the code could change in bad ways. Fixes #17940	4 weeks ago
Paolo Ricciuti	425fba33fe	fix: hydration comments during hmr (#17975) ... Closes #17972 Claude found this fix I had a look and I think it makes sense (we are injecting a new comment which messes up the marching during hydration). I'm slightly confused why this only applied to `css_props` but I guess that's because there's an "hidden" element there which makes it special. I don't super-like the `if` situation, but I guess it is what it is. Also the test was using `hmr` without `dev` and this brought to my attention that we were just assuming components return something while it's not the case...I guess it doesn't really matter unless you are using `hmr` in prod which is not a thing but fixing this is simple so we might just as well doing it	1 month ago
Simon H	803c565feb	fix: properly invoke `iterator.return()` during reactivity loss check (#17966) ... The logic was flipped - `iterator.return()` should be called when the iterator is abnormally ending, not when it's normally ending. Fixes #16610	1 month ago
Rich Harris	0adc22c9ae	fix: defer batch resolution until earlier intersecting batches have committed (#17162) ... This fixes an awkward bug with `each` blocks containing `await`, especially keyed `each` blocks. If you do `array.push(...)` multiple times in distinct batches, something weird happens — to the `each` block, the array looks this... ```js [1] ``` ...then this... ```js [undefined, 2] ``` ...then this... ```js [undefined, undefined, 3] ``` ...and so on. That's because as far as Svelte's reactivity is concerned, what we're _really_ doing is assigning to `array[0]` then `array[1]` then `array[2]`. Those (along with `array.length`) are each backed by independent sources, which we can rewind individually when we need to 'apply' a batch. When it comes to sources that actually _are_ independent, this is useful, since we apply the changes from batch B to the DOM while we're still waiting for a promise in batch A to resolve. But in this case it's not ideal, because you would expect these changes to accumulate. In particular, this fails with keyed `each` blocks because duplicate keys are disallowed (assuming the key function doesn't break on `undefined` _before_ the duplicate check happens). This PR fixes it by stacking batches that are interconnected. Specifically, if a later batch has some (but not all) sources in common with an earlier batch, then when we apply the batch we include the sources from the earlier batch, and block it until the earlier batch commits. When the earlier batch commits, it will check to see if doing so unblocks any later batches, and if so process them. In the course of working on this I realised that `SvelteSet` and `SvelteMap` aren't async-ready — will follow up this PR with ones for those. Fixes #17050 --------- Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com> Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>	1 month ago
github-actions[bot]	7ec156a7b0	Version Packages (#17953) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.54.0 ### Minor Changes - feat: allow `css`, `runes`, `customElement` compiler options to be functions ([#17951](https://github.com/sveltejs/svelte/pull/17951)) ### Patch Changes - fix: reinstate reactivity loss tracking ([#17801](https://github.com/sveltejs/svelte/pull/17801)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	1 month ago
Rich Harris	c89f6abae8	feat: allow `css`, `runes`, `customElement` compiler options to be functions (#17951) ... Alternative to #17950. Closes #17952 The goal of this is to allow svelte.config.js to contain functions for setting certain options, so that there's a single source of truth for everything that needs to interact with Svelte config (plugins, editor extensions, etc): ```js // svelte.config.js export default { compilerOptions: { css: ({ filename }) => filename.endsWith('/OG.svelte') ? 'injected' : 'external', experimental: { async: true }, runes: ({ filename }) => !filename.split(/\/\\/).includes('node_modules') } }; ``` Once this ships, we can deprecate `dynamicCompileOptions` in `vite-plugin-svelte`. ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [ ] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint`	1 month ago
Rich Harris	5faf102782	fix: reinstate reactivity loss tracking (#17801) ... We commented out this code in #17038 because it was broken. I suspect it was broken because we weren't correctly calling `unset_context` inside `run`, leading to false positives — this is now fixed, and as such I _think_ we can safely reinstate it. One small change — I got rid of the `was_read` check. I assume this existed to prevent duplicate warnings, but it actually causes false negatives in the case where you read a signal while the reaction is being tracked then again while it's untracked. ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [ ] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint` --------- Co-authored-by: Tee Ming <chewteeming01@gmail.com>	1 month ago
github-actions[bot]	6a303c3638	Version Packages (#17936) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.53.13 ### Patch Changes - fix: ensure `$inspect` after top level await doesn't break builds ([#17943](https://github.com/sveltejs/svelte/pull/17943)) - fix: resume inert effects when they come from offscreen ([#17942](https://github.com/sveltejs/svelte/pull/17942)) - fix: don't eagerly access not-yet-initialized functions in template ([#17938](https://github.com/sveltejs/svelte/pull/17938)) - fix: discard batches made obsolete by commit ([#17934](https://github.com/sveltejs/svelte/pull/17934)) - fix: ensure "is standalone child" is correctly reset ([#17944](https://github.com/sveltejs/svelte/pull/17944)) - fix: remove nodes in boundary when work is pending and HMR is active ([#17932](https://github.com/sveltejs/svelte/pull/17932)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	1 month ago
Simon H	f081a6c3b1	fix: resume inert effects when they come from offscreen (#17942) ... The offscreen branch was missing the "resume inert effects" logic that was just below; it never reached that because of the early continue. Fixes #17851	1 month ago
Rich Harris	1cd06451af	fix: remove nodes in boundary when work is pending and HMR is active (#17932) ... Fixes https://github.com/sveltejs/svelte/issues/17918#issuecomment-4054067024. The issue here was that in `boundary.#render`, if `this.#pending_count > 0` we yoink the content out of the DOM so we can replace it with the `pending` fragment. This works by taking everything from `effect.nodes.start` to `effect.nodes.end` and putting it in a `DocumentFragment`. With HMR, that doesn't work, because the effect with the nodes is buried inside the HMR effect. This fixes it. Draft because I'd like to try this out in a few more places before merging.	1 month ago
Simon H	32a48ed174	fix: don't eagerly access not-yet-initialized functions in template (#17938) ... Our "hey this is a thunk invoking a function, let's flatten that" logic caused a bug where lazily-initialized functions where eagerly referenced in the template effect. That causes a nullpointer. Ensuring these variables are always referenced in a closure fixes #17404 --------- Co-authored-by: Rich Harris <rich.harris@vercel.com>	1 month ago
Simon H	b472171de6	fix: ensure `$inspect` after top level await doesn't break builds (#17943) ... Turn empty statements into empty thunks so that `$.run/$$render.run` don't throw (as they expect functions as input) Fixes #17514	1 month ago
Simon H	d4bd6ad8f3	fix: ensure "is standalone child" is correctly reset (#17944) ... We didn't set this back to `false`, which can lead to wrong results if the parent happened to have it set to `true` Fixes #17730	1 month ago
Rich Harris	98e8b635fa	fix: discard batches made obsolete by commit (#17934) ... Batches that are made stale (because of a `STALE_REACTION`) can end up sticking around indefinitely, forcing every subsequent batch into time-traveling mode and causing incorrect `previous` values to be rendered. This partially fixes it, by discarding any older batches that are subsets of a batch currently being committed. It's not a complete fix, though — if an earlier batch is stale but is _not_ a subset of the committed batch, it becomes a zombie, and its changes will never be applied. Haven't quite figured out how to think about that yet. ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint`	1 month ago
github-actions[bot]	8b86bdd82d	Version Packages (#17919) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.53.12 ### Patch Changes - fix: update `select.__value` on `change` ([#17745](https://github.com/sveltejs/svelte/pull/17745)) - chore: add `invariant` helper for debugging ([#17929](https://github.com/sveltejs/svelte/pull/17929)) - fix: ensure deriveds values are correct across batches ([#17917](https://github.com/sveltejs/svelte/pull/17917)) - fix: handle async RHS in `assignment_value_stale` ([#17925](https://github.com/sveltejs/svelte/pull/17925)) - fix: avoid traversing clean roots ([#17928](https://github.com/sveltejs/svelte/pull/17928)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	1 month ago
Simon H	1ebed68322	fix: avoid traversing clean roots (#17928) ... Before #17805, all batches drew from the same `queued_root_effects` and did reset them to the empty array when starting a flush. After the refactoring roots are scheduled per batch. This introduces a possible race condition where the same root is scheduled multiple times. It was possible because of the rebase logic in `#commit` not clearing the array of roots, so if you somehow flush that same batch later, you will end up traversing a clean root. (it is possible a bug like this always existed with rebasing it was just impossible hard to trigger it before because everyone drew from the same root effects array) The fix is a bit more complicated than just checking if new roots where added, we gotta check if we actually created async work before traversing. Fixes #17918 --------- Co-authored-by: Rich Harris <rich.harris@vercel.com>	1 month ago
Conduitry	965f2a0ac8	fix: handle async RHS in assignment_value_stale (#17925) ... Fixes #17924. This also DRYs stuff a bit by making `operator` an argument to the runtime helper function, which means we only need two variants of it: regular and async. It also makes it so that `=` assignments don't use the getter, because they don't need to be done lazily. I've added `skip_no_async` to the new test, but I'm not entirely clear on why it was failing the TestNoAsync run to begin with. ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint` --------- Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>	1 month ago
Rich Harris	a513da0445	chore: add invariant utility (#17929) ... With this, we can add invariants to the codebase so we can identify problems like 'this batch already has roots scheduled', which indicate a bug somewhere, without a) needing tests for scenarios that are inherently hard to anticipate, or b) cluttering people's prod bundles	1 month ago
Apoorv Darshan	3dbd95075c	fix: keep select.__value current when effect is deferred (#17745) ... ## Summary Fixes #17148 When a `<select>` is focused inside an async boundary, the `bind_select_value` effect gets deferred by the batch system, leaving `select.__value` stale. If options then change dynamically (e.g. via `{#each}`), the `MutationObserver` in `init_select` uses the stale `__value`, snapping the select to the wrong option. - Update `__value` in the change handler so it's always current, even when the effect is deferred - Update `__value` in the effect's early-return path (defensive fix for when the effect runs but skips the DOM update) ## Test plan - Added `select-dynamic-options-while-focused` test that renders a `<select>` with dynamic `{#each}` options inside an async boundary, selects a non-initial option while focused, adds another option, and verifies the select retains the user's choice - Verified existing `async-binding-update-while-focused-3` test still passes - All 7151 tests pass (`pnpm test`) --------- Co-authored-by: Tee Ming <chewteeming01@gmail.com> Co-authored-by: Rich Harris <rich.harris@vercel.com> Co-authored-by: Rich Harris <hello@rich-harris.dev>	1 month ago
Simon H	44c4f213e9	fix: ensure deriveds values are correct across batches (#17917) ... capture derived updates aswell so they become part of current/previous so that `batch_values` computation is correct when e.g. using `$state.eager` with a derived. Fixes #17849	1 month ago
github-actions[bot]	bd433c5ceb	Version Packages (#17901) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.53.11 ### Patch Changes - fix: remove `untrack` circular dependency ([#17910](https://github.com/sveltejs/svelte/pull/17910)) - fix: recover from errors that leave a corrupted effect tree ([#17888](https://github.com/sveltejs/svelte/pull/17888)) - fix: properly lazily evaluate RHS when checking for `assignment_value_stale` ([#17906](https://github.com/sveltejs/svelte/pull/17906)) - fix: resolve boundary in correct batch when hydrating ([#17914](https://github.com/sveltejs/svelte/pull/17914)) - chore: rebase batches after process, not during ([#17900](https://github.com/sveltejs/svelte/pull/17900)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	1 month ago
Rich Harris	7c9ff8fc69	fix: resolve boundary in correct batch when hydrating (#17914) ... Fixes #17907. When hydrating, we were resolving the boundary in the hydration batch rather than the batch created inside the `queue_micro_task` inside `#hydrate_pending_content`. This meant that effects got scheduled inside a batch that was already resolved. ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint`	1 month ago
Rich Harris	667896a753	fix: recover from errors that leave a corrupted effect tree (#17888) ... https://github.com/sveltejs/svelte/pull/17680#issuecomment-3888440736. Errors that occur during traversal (not inside a template effect etc) can leave dirty effects inside the effect tree, but with clean parents. This means that a) subsequent changes to their dependencies won't schedule them to re-run b) subsequent batch flushes won't 'reach' them unless a sibling effect happens to be made dirty The easiest way to fix this is to just repair the tree if traversal fails. If you had a truly ginormous tree this could conceivably take a noticeable amount of time, but that's probably better than the app just being broken. Note that this doesn't apply to errors that occur inside an error boundary, because in that case the offending subtree gets destroyed. This is just for errors that bubble all the way to the root. Closes #17680, closes #17679.	1 month ago
Paolo Ricciuti	e4e089310d	fix: remove `untrack` circular dependency (#17910) ... Closes #17899 by importing `untrack` from the actual file instead of the `index-client.js`. Verified by packing the library and launching a build with it.	1 month ago
Conduitry	58f161dee2	fix: properly lazily evaluate RHS when checking for assignment_value_stale (#17906) ... Fixes #17904 by wrapping the RHS in a `() =>`. ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint`	1 month ago
Rich Harris	0e8f49b25f	chore: rebase batches after process, not during (#17900) ... This is part of me trying to figure out #17162. It feels less confusing to rebase other branches after the current batch has been processed, rather than sort of doing it in the middle (which is an artifact of historical constraints that no longer apply). No test because it doesn't change any user-observable behaviour (but I added a changeset just in case) ### Before submitting the PR, please make sure you do the following - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] Prefix your PR title with `feat:`, `fix:`, `chore:`, or `docs:`. - [x] This message body should clearly illustrate what problems it solves. - [ ] Ideally, include a test that fails without this PR but passes with it. - [x] If this PR changes code within `packages/svelte/src`, add a changeset (`npx changeset`). ### Tests and linting - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint`	1 month ago
github-actions[bot]	72cd247c33	Version Packages (#17896) ... This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.53.10 ### Patch Changes - fix: re-process batch if new root effects were scheduled ([#17895](https://github.com/sveltejs/svelte/pull/17895)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>	1 month ago