People could've done bind:this and called instance methods on the instance - a rare case, but not impossible. This shims $set and $on when in legacy compat mode. $destroy is never shimmed because you shouldn't manually destroy a component, ever, and there's no way to make that work in the new world.
closes#10420
fixes#10271
The prior fix in #10307 wasn't quite right, because JSDom has a difference between window and event.composedPath which sounds like a bug, and a workaround in that PR made it so the test did pass when the bug still occurred. That's also why there isn't a test here, because we can't properly test this using JSDom.
* fix: correctly handle proxied signal writes before reads
* managed
* Update packages/svelte/src/internal/client/proxy.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
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Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
fixes#10511
We used the animation frame dance previously where the `$effect` timing was slightly different and did not wait on its children before rerunning. With that changed now everything false into place nicely.
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
The previous `bind_this` implementation had flaws around timing and didn't work correctly when the binding wasn't `$state` in runes mode.
This PR reimplements `bind_this` by aligning it more with how Svelte 4 bindings work, namely reacting to each block context variables updates properly and introducing a mechanism to get the previous binding destination using said variables.
* fix: improve $inspect handling of derived objects
* Update packages/svelte/src/internal/client/runtime.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
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Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* fix: remove memory leak
* changeset
* mutable_source is only used in non-runes mode, no need to check here
* simplify
* oops
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
* fix: remove readonly validation
The readonly dev time validation results in false-negative object equality checks: The original object is proxified and thus comparisons could be between the unproxified and proxified version, which will always return false. Fixes#10372
There's also the problem that an object could be passed into a component but then passed upwards into shared state. At that point, it should no longer be readonly, but it's not possible to statically analyze these points. Fixes#10372
Lastly, the each block logic mutates an internal array and that also throws errors with the readonly logic. Fixes#10037
* reinstate tests
* track ownership of state and mutations
* working?
* remove old changeset
* tidy
* error
* simplify
* fix
* fix
* fix
* tidy
* make it a warning
* rename test
* remove unused test
* update tests
* slap ts-expect-error everywhere, because its too finicky otherwise
* oops
* oh no the hall monitor is here
* only call add_owner in dev
* only owners can transfer ownership
* simplify
* fixes
* tidy up
* fix type error
* while we're at it
* rename file
* rename functions
* add some comments
* move ownership checking logic
* ugh eslint
* more detailed message
* only add filename in dev
* comment
* update tests
* move more code
* undo change to sourcemap tests
* allow proxy to have multiple owners
* use SignalDebug
* i was doing this all wrong
* tidy up
* implement inheritance
* fix
* tidy up
* update filename stuff
* changeset
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Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
Co-authored-by: Rich Harris <rich.harris@vercel.com>
Adjusts the escaping mechanism done for server compilation. For template literals it's now only applied when explicitly told, which is the case for generated literals from the html template. Fixes a bug where a template literal string inside the `@html` tag was wrongfully escaped (https://github.com/sveltejs/svelte/issues/10359#issuecomment-1949678228)
In Svelte 4, scripts inside `@html` were not executed when it was created client-side. This is because `innerHTML = ..` which was used under the hood does not execute scripts due to security reasons. This adjusts the code so the same is true for Svelte 5.
Ensure update methods of actions and reactive statements work with fine-grained `$state` by deep-reading them. This is necessary because mutations to `$state` objects don't notify listeners to only the object as a whole, it only notifies the listeners of the property that changed.
fixes#10460
fixes https://github.com/simeydotme/svelte-range-slider-pips/issues/130
* failing test for :is(...)
* simplify
* trim
* factor out truncate function
* pass stylesheet around
* recurse into :is and :where
* fix types
* fix types
* almost there
* gah so close
* tada
* changeset
* simplify
* feat: nested CSS support (#10491)
* parse nested CSS
* tests
* track parent rules
* some progress
* switch it up
* pruning
* works
* changeset
* lint
* error early on invalid nesting selector
* tidy
* note to self
* fix some specificity stuff
* failing test
* note to self
* fix: correctly scope CSS selectors with descendant combinators (#10502)
* fix traversal, but break some other stuff
* man this is fucken hard
* fixes
* getting closer
* be conservative for now
* tidy
* invert
* invert
* simplify
* switch
* for now
* progress
* i think it works?
* fix
* tidy up
* revert some stuff
* remove some junk
* handle weird cases
* update
* tweak
* shrink
* changeset
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
* Update playgrounds/sandbox/run.js
* changeset
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
* feat: add hydrate method, make hydration treeshakeable
Introduces a new `hydrate` method which does hydration. Refactors code so that hydration-related code is treeshaken out when not using that method.
closes#9533
part of #9827
* get docs building
* ugh
* one more
* Update packages/svelte/scripts/check-treeshakeability.js
Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>
* warn
* Update sites/svelte-5-preview/src/routes/docs/content/01-api/05-functions.md
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Co-authored-by: Rich Harris <richard.a.harris@gmail.com>
Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>
Co-authored-by: Rich Harris <rich.harris@vercel.com>
Add source map merging for preprocessors and get tests passing.
- fixed some issues around the `sources` array where they weren't calculated relative to the input correctly
- adjusted some CSS tests because due to our own CSS parser the AST is less granular, so there are less mappings now. Don't think this is a problem, but worth thinking about
- removed enableSourcemap but only log a warning, the reason this was introduced was to mitigate a bug in Vite which occured when having the source map inlined into the SSR'd output. Since SSR doesn't contain inlined CSS anymore (and if it did, we would omit the source map) the reason for which it was introduced no longer exists
- files without js mapping in it have no source mappings yet (originally added in Svelte 4 for #6092)
* rename $derived.call to $derived.by
* more replacements, plus a compiler error
* regenerate types
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
Relax the runtime error to only throw when you're passing a binding with an undefined value. This makes it possible to provide components in a way that can be used more flexibly while keeping the error to guard against the case that we want to avoid: a default value propagation up.
* fix: handle sole empty expression tags
When there's only a single expression tag and its value evaluates to the empty string, special handling is needed to create and insert a text node
fixes#10426
* fix
* need this, too
* Update packages/svelte/src/internal/client/operations.js
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Co-authored-by: Rich Harris <richard.a.harris@gmail.com>
Closes#9420.
This PR creates an $effect.pre (before beforeUpdate and an $effect (for afterUpdate) and, inside those, listen for all locally declared signals plus reactive props. This does mean that we need to link the locally declared signals to the component context (the reverse of the current behaviour, wherein we link the component context to locally declared signals).
fixes#10296
Also make sure to use the server export conditions when resolving Svelte imports from inside the server compiler output
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
- Previously, any each block parents where used as keys for the sub group. That's wrong, it should only be using each blocks whos declarations contribute to the `bind:group` expression. Fixes#10345
- Only the left-most identifier of the expression was used to determine the binding group. This is wrong, all identifiers within the expression need to be taken into account. Fixes#9947
* fix: don't reuse proxies when state symbol refers to stale value
When somebody copies over the state symbol property onto a new object (you can retrieve the symbol by using `Reflect.ownKeys(...)`), it was wrongfully assumed that it always relates to the current value. This PR adds an additional check that this is actually the case.
This also adds a dev time warning when an object is frozen but contains a state property, which hints at a bug in user land.
fixes#10316
* lint
* rename
* remove warning
* update test
* changeset
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
Co-authored-by: Rich Harris <richard.a.harris@gmail.com>
* strip typescript assertions before analysis
* add test
* changeset
* move ts handling from transform to before analysis
* format
* types
* remove unwrap_ts_expression
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Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
* fix: improve unstate handling of non enumerable properties
* Update packages/svelte/src/internal/client/proxy.js
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Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* give this another try
* fix: lint
* fix: Forgot to save
* feat: it works boiiii
* look, ok, it did work, i just needed to update the snapshots
* bruh
* changeset
* feat: ok I think the client snippet block finally works
* feat: current tests pass; I'm sure I'm missing stuff for new things
* fix: snapshot
* feat: I think non-destructured rest should work now?
* chore: duplicated computation
* feat: Tests (passing and failing
* feat: it's... alive?
* chore: Clean up my messes
* chore: devtime stuff
* fix: fmt
* chore: see if this fixes repl
* chore: make naming more offensive
* fix: Don't throw on missing keys, return undefined as it usually would
* Update packages/svelte/src/compiler/phases/1-parse/state/tag.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* Update packages/svelte/src/compiler/phases/1-parse/state/tag.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* fix: Hopefully default param values now work
* dumb
* types
* feat: Test it
* fix: Turns out javascript parameters are optional
* feat: The Final Solution
* document function
* feat: Better bracket matching, unit tests
* feat: exclude test files from publish
* feat: More unit tests
* feat: Use more efficient parsing for @const
* Update .changeset/curvy-cups-cough.md
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* Update packages/svelte/package.json
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* Update packages/svelte/src/compiler/phases/1-parse/utils/bracket.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* fix: changesets
* chore: additional comments
* fix: kill foreach
* fix: foreach again
* feat: Docs
* Revert "fix: kill foreach"
This reverts commit 9a688cc543.
* fix: My own stupidity
* fix: style
* fix - maybe
* Update sites/svelte-5-preview/src/routes/docs/content/01-api/03-snippets.md
* Update tag.js
Co-authored-by: Rich Harris <richard.a.harris@gmail.com>
* Update .changeset/curvy-cups-cough.md
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* chore: Remove rest params
* Delete .changeset/eighty-rivers-wash.md
* fix: Honestly idk why it was broken but it's fixed now
* fix: var name lol
* fix: typegen
* fix: idk
* fix: It looks like a bunch of unformatted shit came in through main?? idk
* Revert "fix: It looks like a bunch of unformatted shit came in through main?? idk"
This reverts commit ab851d5627.
* fix: format again
* this is getting ridiculous
* Update tag.js
Co-authored-by: Rich Harris <richard.a.harris@gmail.com>
* fix errors
* simplify a bit
* use read_context
* use read_context for const as well
* remove unused code
* unused import
* unused export
* remove spread args. sorry elliott
* tidy up SnippetBlock interface
* fix test
* simplify
* tweak
* revert example, so that it matches the surrounding text
* move PropsWithChildren back to public.d.ts
* update typing docs, so that it flows from previous example
* temporarily revert const parsing changes, to get prettier working again (???)
* oops
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Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
Co-authored-by: Rich Harris <richard.a.harris@gmail.com>
Co-authored-by: Rich Harris <rich.harris@vercel.com>
If you had `on:` directives listening to the same name (through multiple on:click on the same element or indirectly through multiple `<svelte:window>` elements with event listeners of the same name) there was a bug of delegation firing too often. This PR fixes that by tweaking the "should I continue with the given path index" logic.
fixes#10271
Accessing values might throw errors if they're not just values but getters. Guard against that by try-catching every access so that `$inspect` doesn't fail
fixes the iframe error in the playground reported in #10174
Someone could programmatically add a class to an element and Svelte doesn't see it, so having global be part of a modifier is necessary so that Svelte doesn't mark it as unused
fixes#10210
If a list is passed to a component and an item of that list is passed as a slot prop back up, then mutating a property of that item did not result in a rerun. The reason was that derived is using object identity equality, resulting in the value not being updated. To fix it, we use safe-equals in this situations instead.
* fix: simplify event delegation logic
Only delegate event attributes, and don't take into account bindings/actions while determining that. Never delegate `on:` directives. This simplifies the logic and makes it easier to explain, while avoiding any accidental breaking changes when upgrading from Svelte 4 to 5 without changing code.
Fixes#10165
Related to #9714
* update types
Add recursive check for logic blocks, ignore things such as ConstTags and Comments
closes#10025
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Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
It's an unnecessary restruction because it can be worked around (hide it behind a getter/setter), already works for bind:x and prevents valid use cases
The validation exists to error on html that would result in the browser repairing it, causing hydration errors. input is never moved, so we can remove it from the array
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Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
- the objects could contain getters with reactive values, so we play it safe and assume they're always reactive - fixes#10065
- isolate spreads with call expression similar to how we do it with other effects -fixes #10013
When doing `$inspect({ x, y })`, both `x` and `y` are now unstated if they are signals, compared to before where `unstate` was only called on the top level object, leaving the proxies in place which results in a worse debugging experience.
Also improved typings which makes it easier to find related code paths.
Simon H
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