* feat: add Spring class
* add some docs, Spring.of static method
* add Tween class
* lint
* preserveMomentum in milliseconds
* deprecate tweened
* changeset
* wrestle with types
* more consolidation
* flesh out the distinction a bit more, deprecate `subscribe`
---------
Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
* chore: make if blocks dead code eliminable
* chore: make if blocks dead code eliminable
* chore: make if blocks dead code eliminable
* address feedback
* address feedback
* prettier
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
When the `value` or `checked` attribute of an input or the contents of a textarea were static, setting the `defaulValue/defaultChecked` property caused the latter to take precedence over the former. This is due to how we transform the code: If the value is static, we put it onto
* tests
* typings
* implement for defaultValue/defaultChecked on inputs
* docs (draft)
* selected
* fix test
* remove
* tweak
* changeset
* untrack reads, they could be inside an effect
* Apply suggestions from code review
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* handle select reset case
* handle reset case specifically: use different props/queries in that case
* enhance test
* fix
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* fix: better error messages for invalid HTML trees
closes#13331
* fix test
* more concise
* tweak
* tweak messages
* adjust tests
* tweak message slightly, so it doesn't sound like the bad element is the one we're currently encountering
* put locations in generated message
* tidy up
* consistency
* fix
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* add failing test for #14268
* simplify
* proxify values when using ||=, &&= and ??= assignment operators
* proxify values assigned to private state fields
* changeset
* fix
* fix
* add warning
* update test
* fix: don't try to add owners to non-`$state` class fields
`$state.raw` and `$derived(.by)` will not have a state symbol on them, potentially causing a disastrous amount of traversal to potentially not find any state symbol. So it's better to not traverse them.
Potentially someone could create a `$state` while creating `$state.raw` or inside a `$derived.by`, but that feels so much of an edge case that it doesn't warrant a perf hit for the common case.
Fixes#14491
* for bind:, too
* fix: ensure SvelteDate cached methods have no reactive context
* fix: ensure SvelteDate cached methods have no reactive context
* fix
* lint
* use active reaction at time of instance creation
* tweak changeset
* Update packages/svelte/src/internal/client/dom/elements/bindings/shared.js
Co-authored-by: Paolo Ricciuti <ricciutipaolo@gmail.com>
---------
Co-authored-by: Dominic Gannaway <dg@domgan.com>
Co-authored-by: Paolo Ricciuti <ricciutipaolo@gmail.com>
* turn `reactive_declaration_non_reactive_property` into a runtime warning
* ignore warning
* Update packages/svelte/src/internal/client/reactivity/effects.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* Update packages/svelte/src/internal/client/runtime.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* fix
* test
* changeset
* Update .changeset/witty-turtles-bake.md
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* add some details
* check
* regenerate
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* Fix `$.update` and `$.update_pre` for bigints
* resolve conflicts
* fix some things
* fix thing i definitely didn't just break
* hopefully this will fix it
* fix formatting
* simplify
* style consistency
* simplify
* changeset
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* fix: upgrade to esm-env 1.2.1 to fix issues with non-Vite setups
* fix (albeit with annoying warnings)
* bundle with conditions to silence noise
* production is probably better
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
fixes#14466
The logic introduced in #14395 was flawed - not every text or expression outside the template is the child of an attribute. This turns it around: We know that every child of a fragment is inside the template, so we ignore all text/expression tags that are not child of a fragment
Fixes#14399
Add a mechanism to connect render tags to snippets to know where to walk when coming across render tags
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
fixes#14439
This bug was introduced in #13642 because setting the input to null means the equality check ("is the input different") fails if you set the value to null
Also fixes#14441 - this bug was present for a long time, and the reason is the same as for the other bug: The equality check always returns "yes this is the same" if the value is undefined initially. The fix is similar; we need to initialize the input to something that can never be equal to whatever value is passed
This reverts #13255 / #13158, and helps with the validation error part of #14120
If you would have a component like this...
```svelte
<td>hi there</td>
```
...and then render it on the server via our `render` function like this:
```js
const result = render(Main);
```
...then right now you get an error saying that `td` is not valid at this position. But that doesn't seem right, because we should give people the benefit of the doubt: It may very well be that someone renders such a component and then correctly puts it into a `tr` tag themselves on the server (another example is rendering a full html document like in #14120).
All the other validation where there's a known parent (X not valid inside Y) is untouched by this.
Doing this as cleanup prior to tackling #13331
* fix: always use set for private identifiers
* we can simplify this further - no need to check the value was transformed, since the outcome of not returning immediately is the same but with extra steps
* add explanatory note
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
through #14363 I noticed our `export default` validation wasn't quite right:
- missed checking for derived/state exports
- the "cannot have a default export" error was only thrown if you did `export default` from the instance script, but it shouldn't matter from which component part you export it; it's never ok
* fix: ensure internal cloning can work circular values
* better fixc
* 'original' feels slightly clearer than 'json_instance'
* use an optional parameter, so we can omit it in most cases
* Update packages/svelte/src/internal/shared/clone.js
Co-authored-by: Rich Harris <rich.harris@vercel.com>
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
The detection whether or not props are writable is buggy; it doesn't take into account the case when instantiating components via `mount` or legacy-`new`
Fixes#14161
This posed an interesting question: What to do about (non-)`bind:`able properties? The answer I arrived on was: Treat it as if everything that _can_ be bound _is_ treated as bound, and everything else as readonly. In other words, if you're reassigning a prop, it will diverge from the passed in props if it's not bindable or not set in the parent, otherwise it will mutate the passed in props. I think that makes the most sense, given that you can't control this behavior from the outside.
* fix: avoid marking subtree as dynamic for inlined attributes
* fix: i'm a silly goose 🪿
* chore: refactor `is_inlinable_expression` to accept the attribute
* feat: inline dom expression too
* fix: special case literals with `"` in it and fix standalone case
* chore: simpler check first
Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>
* typo
* add more stuff to snapshot test
* simplify/speedup by doing the work once, during analysis
* simplify
* simplify - no reason these cases should prevent inlining
* return template
* name is incorrect
* name is incorrect
* fix escaping
* no longer necessary
* remove obsolete description
* better concatenation
* fix test
* do the work at runtime
* fix another thing
* tidy
* tidy up
* simplify
* simplify
* fix
* note to self
* another
* simplify
* more accurate name
* simplify
* simplify
* explain what is happening
* tidy up
* simplify
* better inlining
* update test
* colocate some code
* better inlining
* use attribute metadata
* Update packages/svelte/src/compiler/phases/2-analyze/visitors/Identifier.js
Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>
* Apply suggestions from code review
---------
Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>
Co-authored-by: Rich Harris <rich.harris@vercel.com>
We previously marked all `:root` selectors as global-like, which excempted them from further analysis. This causes problems:
- things like `:not(...)` are never visited and therefore never marked as used -> we gotta do that directly when coming across this
- `:has(...)` was never visited, too. Just marking it as used is not enough though, because we might need to scope its contents
Therefore the logic is enhanced to account for these special cases. Fixes#14118
While fixing this I cleaned up some inconsistencies in what we mark as global. This simplified code and fixed some adjacent bugs, which conindicentally also fixes#14189
* fix: consider static attributes that are inlined in the template
* fix: use `is_inlinable_expression`
* fix: move check for inlinable expression as last
* fix: simplify and correct
* chore: accept single node in `is_inlinable_expression`
* chore: update comment
* chore: add snapshots for non static nodes
Previously, we were applying an explicit nesting selector to the start of a relative selector chain only when starting the traversal. Prepending the selector is important because it ensures we traverse upwards to the parent rule when the current selectors all matched and there's still more to do. But we forgot to do the prepend for parent rules, which meant that if we were nested two levels deep, we would stop too early. This fix ensures we prepend in that case, too.
Fixes#14178
fixes#14168
This reverts the whole "selectors inside `:not` are scoped" logic. Scoping is done so that styles don't bleed. But within `:not`,everything is reversed, which means scoping the selectors now means they are more likely to bleed. That is the opposite of what we want to achieve, therefore we should just leave those selectors alone.
The exception are `:not` selectors with descendant selectors, as that means "look up the tree" and we need to scope all ancestor elements in that case.
If the contents of a `:not` selector don't match, then it's actually a match for `:not` because it's inverted. Therefore, we need to scope such elements. We're also making sure that contents of `:not` that never match actually count as a used (because the result is negated), and as such the contents of `:not` that always match are actually marked as unused.
Fixes#13974
`<a>` tags are valid in both the SVG and HTML namespace. If there's no parent, we therefore have to look downwards to see if it's the parent of a SVG or HTML element.
fixes#7807fixes#13793
We didn't account for the `$props` rune being writtin in a way that makes some props unknown, and they would only be visible through the `customElement.props` definition. This changes the iteration to account for that and also adds a note to the documentation that you need to list out the properties explicitly.
fixes#13785
Fixes#13848.
When we set custom element attributes/props, we should be doing so without the current effect/reaction active. Otherwise, the custom element lifecycle might attach effects/dependencies to the wrong reaction and all manner of things can incorrectly occur
---------
Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
We originally didn't extend from `Error` anymore because its fields are of no real value to us, and has problems with serialization in a worker context.
Turns out this was a mistake, because various build tools rely on errors being thrown as something that extends Error, else they try to wrap it in their own error.
We therefore revert that change while still trying to preserve most of the advantages of not extending `Error`, namely nuking the useless stack trace and making sure the message is enumerable.
When CSS is externalized we rightfully rely on the following tooling chain to properly minify CSS. When we inject the CSS however, that tooling won't be able to do that, so we gotta do it ourselves.
This PR brings back most of that logic that existed in Svelte 4. Fixes#13716
Only count down after timeout, else we would reach 0 before our own render effect reruns, but reach 1 again when the tick callback of the prior teardown runs. That would mean we re-subcribe unnecessarily and create a memory leak because the old subscription is never cleaned up.
* fix: add empty stack to `CompileDiagnostic` to show error on build
* chore: generate types
* chore: make stack optional to make TS happy
* chore: generate types -.-"
* chore: add comment
* fix: ensure value is correctly set to zero on the progress element
* fix: ensure value is correctly set to zero on the progress element
* fix: ensure value is correctly set to zero on the progress element
* chore: highlight swallowed errors from await blocks in DEV
* chore: highlight swallowed errors from await blocks in DEV
* chore: highlight swallowed errors from await blocks in DEV
* lint
* feedback
* feedback
* add test
* Update packages/svelte/tests/runtime-runes/samples/await-no-catch-error/main.svelte
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* fix: ensure SVG element attributes have case preserved
* fix: ensure SVG element attributes have case preserved
* fix: ensure SVG element attributes have case preserved
* fix: enable bound store props in runes mode components
* add some JSDoc, since it could be a headscratcher for future us
* make it clear that this is specifically about bindings
* skip intermediate value
* tweak other names too
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* fix: internally wrap store subscribe in untrack
* lint
* Update packages/svelte/src/store/utils.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* Version Packages
* Update packages/svelte/CHANGELOG.md
---------
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
Closes#13493.
This PR allows the usage of getContext() inside $derived runes. Previously, you could use it, but only on init and not updates – and this inconsistency was unnecessary. We can make it work just like we do in other places.
I resisted this previously because it felt a bit wasteful, but I now think that there's really no way around this: Instead of only going upwards the tree while matching, for `:has` we go _down_ the tree to see what matches. More specifically, we're collecting the children of the current element and then check if one of those does match the selectors inside `:has`.
This makes the way the code works easier to reason about and also removes some boolean tracking we had to add for the previous approach.
Fixes#13779
Fixes#13717
There are two parts to this:
1. the parent selectors weren't passed along for the check inside `:has`, which in case of a leading combinator would mean it would always count as unused
2. In case if a selector like `x > y:has(z)`, the prior logic would correctly determine that for element `z` there's a match for the `:has` selector, by first checking its contents and then walking up the tree. But after it did that, it would try to walk up the tree once more, which is a) wasteful b) buggy because the tree walking mechanism would no longer be adjusted for the `:has` special case, resulting in false negatives. To fix that, the `:has` will return a new value from the function, signaling that it already fully checked the upper selectors, and so the function calling it will skip doing that.
- detect store mutations and not use `$derived` in that case, fixes#13723
- better detect `let x` that can be folded into `$derived`, fixes#13727
---------
Co-authored-by: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>
- correctly assign children snippet to default slot, fixes#13067
- allow `svelte:fragment` without `let:` directives to be rendered by `@render children()`, fixes#13066
* fix: avoid chromium issue with dispatching blur on element removal
* fix: avoid chromium issue with dispatching blur on element removal
* fix: avoid chromium issue with dispatching blur on element removal
* active effect too
* try/finally
* fix: moving deriveds during migration deletes part of the inserted code
* fix: use update instead of remove
* Update .changeset/cool-apes-confess.md
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
The other part of #13395
This implements scoping for selectors inside `:not(...)`. The approach is almot the same as for `:is/where(...)`.
This is a breaking change because people could've used `:not(.unknown)` with `.unknown` not appearing in the HTML, and so they need to do `:not(:global(.unknown))` instead.
While implementing it I also discovered a few bugs, which are fixed in this PR:
- `foo :is(bar baz)` wasn't properly handled. This selector can mean `foo bar baz` but it can also mean `bar foo baz` (super weird, but it is what it is). Since our current algorithm isn't suited for handling this, we just assume it matches and scope it. Worst case is we missed a prune
- `bar` in `:global(foo):is(bar)` was always marked as unused, even if it matched
The main part of #13395
This implements scoping for selectors inside `:has(...)`. The approach is to first descend into the contents of a `:has(...)` selector, then in case of a match, try to match the rest of the selector ignoring the `:has(...)` part. In other words, `.x:has(y)` is essentially treated as `x y` with `y` being matched first, then walking up the selector chain taking into account combinators.
This is a breaking change because people could've used `:has(.unknown)` with `.unknown` not appearing in the HTML, and so they need to do `:has(:global(.unknown))` instead
* fix: ensure effects destroy owned deriveds upon teardown
* add test
* make old test work
* tune
* tune
* Update packages/svelte/src/internal/client/runtime.js
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* do no rerun the each block when array change from empty to empty
* rename empty yo was_empty
* add test
* fix nullable array on SSR
* format
* rewrite
* chore: add changeset
---------
Co-authored-by: Paolo Ricciuti <ricciutipaolo@gmail.com>
- make sure to not overfire before/afterUpdate
- make sure to not fire mutable sources when they were mutated
- only show deprecation warning when in runes mode to not clutter up console (this is in line with how we made it in other places)
fixes#13454
* fix: ensure set_text applies coercion to objects before diff
* lint
* feedback
* Update packages/svelte/src/internal/client/render.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
fixes#13270 by resetting the has_call boolean to false to style/class attributes, which means we're not creating a separate template effect for the attribute, instead they're added to the common template effect in which style/class directives are also added to later
Fix a bug where play/pause events may never be added to the media element. Also simplifies the logic by making it an effect instead of a render effect
---------
Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
* feat: migrate `svelte:self`
* chore: regenerate types
* fix: special case `<svelte:self></svelte:self>`
* chore: add special case to tests
* chore: add no filename test
* chore: better migration task message
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* chore: make filename an options object to futureproof it
* chore: simplify open tag `svelte:self`
* chore: simplify migration comment test
* chore: generate types
* chore: apply smart suggestion
* chore: changeset
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* feat: enable snippets to fill slots
This allows people to use snippets to fill slots. It is implemented in the same way the default slot interop is already implemented, by passing a boolean to the hidden `$$slots` object, and using that at runtime to determine the correct outcome. The impact on bundle size is neglible.
By enabling this, we can enhance our migration script to always transform slot usages (including `let:x` etc) to snippets. This wasn't possible before because we couldn't be sure if the other side was transformed to using render tags at the same time. This will be part of #13419. This is important because currently the migration script is transforming `<slot />` creations inside components, but since it's not touching its usage points the migration will make your app end up in a broken state which you have to finish by hand.
This is a reduced alternative to, and closes#11619, which was also enabling the other way around, but that is a) not as necessary and b) more likely to confuse people / break, because it only works if your render function has 0-1 arguments.
* unused
* ditto - annotation is redundant
* couple of drive-by consistency tweaks
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* fix: allow combinator at start of nested CSS selector
Solved by moving the combinator positioning validation into the analysis phase
Fixes#13433
* highlight the combinator, not the start of the combinator
* fix
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* feat: fix accessors and support migration of accessors
* fix: exclude slots
* fix: remove call to proxy for accessors props
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* chore: add test for accessors
* chore: fix lint
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* feat: allow migration of `svelte:component`
* chore: simplify a lot (thanks @dummdidumm)
* chore: update output
* chore: use `next()` and `snip` instead of walking the AST
* fix: migrate nested `svelte:component`
* Update .changeset/good-vans-bake.md
---------
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
Fixes#13390
There's pruning logic in a different place where all unused selectors are commented out. If all selectors are unused, the whole prelude is commented out, resulting in invalid syntax. This is a case that shouldn't happen, therefore simplify the whole "is used" logic to only look at the prelude.
Rich Harris
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