* 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>
We're now on Svelte v5.0.0-next.42 which made one test match the 42 of the next version instead of the number in the code, resulting in that test suddenly failing. This fixes the regex to replace that number with x's instead
* 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>
The generated types were invalid TypeScript ("cannot use unique symbol at this position"). Use utility types to ensure the types are not unpacked during type generation.
Leftover from #9988
* 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>
Infer namespace from parents where possible, and do a runtime-best-effort where it's not statically known
fixes#9645
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Co-authored-by: Simon Holthausen <simon.holthausen@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
* Fix weird formatting in recent changelog entry
A recent auto-generated changelog entry had a `<p>` in it, which caused the Markdown rendering to look strange. Replacing `<p>` with `<p>` fixes the rendering.
* Update packages/svelte/CHANGELOG.md
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Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
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.
closes#9969
this also fixes the following along the way:
the + in nth-of-type(+xn-b) would be parsed as a combinator.
invalid cases like these are not allowed anymore:
b(+/-)b
-ax
-ax-b
-b
To ensure that changes to code/types doesn't result in unwanted changes in type generation, or that bumps to dts-buddy don't cause unwanted regressions, we're checking in the generated types. Types should be committed as-is (don't format it with prettier!). CI is enhanced to check that git sees no changed files after generating the types, which would mean types have changed.
closes#10036, this also moves the HTMLDetailsElement toggle event to its interface as it was conflicting with HTMLElement popover toggle event.
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Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* use $$props directly in runes mode
* this makes no sense
* use $$props directly in runes mode
* tidy up
* typo
* remove unreachable code
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* fix: prevent infinite loops stemming from invalidation method
The logic was flawed: the captured signals where always added to the previous captured no matter what, which meant a) memory leak b) that when another one runs afterwards, it will falsely contain the signals from the previous run
fixes#9788
* fix lint
- Expect the thing that's checked to be wrapped with the proxy already, so that we can just check for the state symbol
- Make error message more descriptive
* use proxy instead of signal in createRoot
* DRY
* remove for now
* lint
* chore: use proxies instead of signals for spread/rest props (#9801)
* use proxies instead of signals for spread/rest
* fix some spread attribute stuff
* remove is_signal calls
* simplify some more
* more
* remove some unnecessary unwrapping
* another
* simplify
* simplify
* simplify
* remove another MaybeSignal
* more
* remove more unwraps
* code-golf, docs
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
* add missing jsdoc annotation
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>
* WIP
* update tests
* only make readonly in runes mode
* remove this for now
* changeset
* ugh
* add reassignment test
* tweak message
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
* feat: add unstate utility function
* Update packages/svelte/src/internal/client/proxy/proxy.js
Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>
* update docs
* add class support
* oops
* lint
* fix docs
* remove symbol and class support
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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>
* magic objects
* read length eagerly — triggers reconciliation
* nested magic
* tests
* more tests
* fix array memory leak
* skipped, partially passing array test
* Fix each
revert bad changes
* more 1337
* eliminate closures
* maybe this is unnecessary?
* only create sources for own properties
* more
* rename stuff
* shuffle things around
* emit $.proxy
* remove proxy helper from public API
* only create sources for writable properties
* update test
* get tests passing
* fix
* remove state-not-mutated warning, which is no longer valid
* track reassignments separately from mutations
* update test - effects no longer fire on mutations unnecessarily
* move util into utils file
* move each logic into its own module; breathe sigh of relief
* tweaks
* more tweaks
* improve runtime
* fix mistake
* ensure we proxy when assigning to state
* fix test
* handle frozen
* create sources when reading proxy properties inside deriveds
* only mutate in legacy mode
* add immutable to transform state
* remove unused second argument to derived
* remove unused second argument to source, and runtime immutable option to createRoot (not sure what that was doing there?)
* oops, backwards
* dedicated binding.kind for legacy reactive imports
* avoid using prop_source in more cases. bit hacky, could be tidier, but it works
* distinguish between source and mutable_source
* remove immutable option from mount
* remove unused apparatus around immutable option
* deprecate immutable
* fix
* tweak
* better default value handling
* remove unnecessary exports
* whitespace is free
* remove obsolete symbol from proxy
* cleanup ts
* improve runtime perf by removing version reads in has()
* add missing proxy call
* tune perf of has() more
* ensure we only create sources in effect_active()
* fix proxy of computed fields
* simplify and fix issue with indexed each blocks
* fix compiler errors around exported state
* only create source for state that is reassigned
* temporary fix, we should come up with something better than this
* readonly props
* fix test
* add test for bind:
* make readonly dev-only
* docs
* forbid setPrototypeOf
* lol whoops
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
Co-authored-by: Dominic Gannaway <dg@domgan.com>
* rename dev script, update contributor guide and readme
* turns out we can do this!
* increase accuracy
* justify FILTER
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Co-authored-by: Rich Harris <rich.harris@vercel.com>
* fix: handle ts expressions when dealing with runes
related to #9639
* docs, more tests
* simplify
---------
Co-authored-by: Rich Harris <rich.harris@vercel.com>
The deleted code ensured that a static variable wouldn't update when it's in the same text expression as a reactive variable. We solved this through emitting a warning about this instead, marking it as undefined behavior.
- doesn't add spread_dynamic_element_attributes when there are no attributes — Unnecessary spread_dynamic_element_attributes call #9646
- skips the child render function altogether if there is nothing to do
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