Svelte changelog

3.46.6

Actually include action TypeScript interface in published package (#7407)

3.46.5

Add TypeScript interfaces for typing actions (#6538)
Do not generate unused-export-let warning inside <script context="module"> blocks (#7055)
Do not collapse whitespace-only CSS vars (#7152)
Add aria-description to the list of allowed ARIA attributes (#7301)
Fix attribute escaping during SSR (#7327)
Prevent .innerHTML optimization from being used when style: directive is present (#7386)

3.46.4

Avoid maximum call stack size exceeded errors on large components (#4694)
Preserve leading space with preserveWhitespace: true (#4731)
Preserve leading space in <pre> tags (#6437)
Improve error message when trying to use style: directives on inline components (#7177)
Add FormData as a known global (#7199)
Mark css/instance/module AST properties as optional in types (#7204)

3.46.3

Ignore whitespace in {#each} blocks when containing elements with animate: (#5477)
Throw compiler error when variable in context="instance" collides with import in context="module" (#7090)
Fix compiler crash when {@const} contains arrow functions (#7134)

3.46.2

Export FlipParams interface from svelte/animate (#7103)
Fix style: directive reactivity inside {#each} block (#7136)

3.46.1

Handle style:kebab-case directives (#7122)
Improve AST produced for style: directives (#7127)

3.46.0

Implement {@const} tag (RFC #33, #6413)
Implement style: directive (RFC #42, #5923)
Fix style manager conflicts when using multiple Svelte instances (#7026)
Fix hydration when using {@html} (#7115)

3.45.0

Fix non-boolean attribute rendering in SSR to render truthy values as-is (#6121)
Fix binding to a member expression also invalidating the member property (#6921)
Fix default values in {#each}/etc. destructurings not being considered references for the purposes of compiler warnings (#6964)
Fix {:else if} value incorrectly being cached (#7043)
Add a11y-no-redundant-roles warning (#7067)
Fix code generation error with arrow functions whose bodies are object destructuring assignments (#7087)

3.44.3

Fix bind:this binding inside onMount for manually instantiated component (#6760)
Prevent cursor jumps with one-way binding for other type="text"-like <input>s (#6941)
Exclude async loops from loopGuardTimeout (#6945)

3.44.2

Fix overly restrictive preprocessor types (#6904)
More specific typing for crossfade function - returns a tuple, not an array (#6926)
Add URLSearchParams as a known global (#6938)
Add types field to exports map (#6939)

3.44.1

Fix code generation when a multi-line return statement contains comments (code-red#36)
Fix code generation when for/if/while statements have empty bodies (#6884)

3.44.0

Add enableSourcemap compiler option (#6835)

3.43.2

Fix regression where user-specified imports were not rewritten according to the sveltePath option (#6834)

3.43.1

Prevent a rejecting promise used in {#await} during SSR from appearing as an unhandled rejection (#6789)

3.43.0

Use export map to expose no-op versions of lifecycle functions for SSR (#6743)
Prefer context passed to component constructor, even when running synchronously in another component (#6753)
Handle preprocessors that return empty sourcemaps (#6757)

3.42.6

Hide private preprocess typings (#6622)
Fix reactive function in {:else if} expression not being properly re-run (#6727)

3.42.5

In draw transition, account for stroke-linecap in determining length (#4540)
Fix regression with destructuring assignments with default values (#6699)

3.42.4

Only apply optimized src attribute handling when in an html namespace (#6575)
Fix styles for transitions and animations being attached to the wrong document in <iframe>s (#6637)
Fix <select> with a {...spread} attribute that didn't provide a value key getting its value improperly unset (#6675)

3.42.3

Add BigInt as a known global (#6671)
Fix regression where onDestroy in svelte/ssr was improperly a no-op (#6676)

3.42.2

Collapse whitespace in class and style attributes (#6004)
Deselect all <option>s in a <select> where the bound value doesn't match any of them (#6126)
In hydrated components, only rely on helpers for creating the types of elements present in the component (#6555)
Add HTMLElement and SVGElement as known globals (#6643)
Account for scaling in flip animations (#6657)

3.42.1

Fix regression with reordering keyed {#each} blocks when compiling with hydration enabled (#6561)

3.42.0

Allow use:actions to be used on <svelte:body> (#3163)
Improve parser errors for certain invalid components (#6259, #6288)
Fix paths in generator JS sourcemaps to be relative (#6598)
Fix overzealous warnings about context="module" variables not being reactive (#6606)

3.41.0

Support export { ... } from syntax in components (#2214)
Support export let { ... } = syntax in components (#5612)
Support {#await ... then/catch} without a variable for the resolved/rejected value (#6270)

3.40.3

Fix <slot> data when a transition is cancelled before completing (#5394)
Fix destructuring into variables beginning with $ so that they result in store updates (#5653)
Fix in: transition configuration not properly updating when it's changed after its initial creation (#6505)
Fix applying :global() for > selector combinator (#6550)
Fix mounting component at detached DOM node (#6567)

3.40.2

Fix dynamic autofocus={...} attribute handling (#4995)
Add filename to combined source map if needed (#6089)
In AST, parse empty attribute values as an empty string (#6286)
Fix tracking whether transition has started (#6399)
Fix incorrect scoping of :global() selectors (#6550)

3.40.1

Fix store reactivity regression when using reactive statements (#6557)

3.40.0

Support rendering a component in a shadow DOM (#5869)
Fix :root selector being erroneously scoped to component (#4767)
Fix .end in AST for expressions inside attributes (#6258)
Fix one-way <select> binding when it has a spread attribute (#6433)
Various hydration improvements and fixes (#6449)
Use smaller versions of internal helpers when compiling without hydration support (#6462)
Fix two-way binding of values when updating through synchronous component accessors (#6502)

3.39.0

Support bind:group in SSR (#4621)
Add a11y warning a11y-mouse-events-have-key-events which checks that mouseover/mouseout are accompanied by focus/blur event handlers (#5938)
Make it possible to silence more warnings (#5954)
Add |trusted event modifier (#6137)
Add varsReport compiler option to include all variables reference in the component in the variables report (#6192)
Add errorMode compiler option to try to continue compiling when an error is detected (#6194)
Expose svelte/ssr which exports lifecycle methods as no-ops (#6416)
Add getAllContexts (#6447)
Throw proper error for export default function() {} and export default class {} rather than crashing the compiler (#3275)
Fix SSR rendering of falsy input values (#4551)
Fix preserveComments in SSR mode (#4730)
Do not warn if context="module" variables are not the only dependencies in reactive statements (#5954)
Stop checking a11y-media-has-caption a11y warning on <audio> elements (#6054)
Fix erroneous "unknown prop" warning when using slot on a component (#6065)
Add sourcemaps to all HTML elements (#6092)
Relax derived function signature (#6178)
Throw compiler error when passing empty directive names (#6299)
Fix compiler error when using :where() inside :global() (#6434)
Fix ordering of elements in keyed {#each} (#6444)
Remove deprecated a11y warning a11y-no-onchange warning (#6457)
Fix :global() with pseudo element not being seen as global (#6468)
Allow :global() to contain multiple selectors when it is not part of a larger selector (#6477)
Make <script> and <style> end tag parsing more robust (#6511)

3.38.3

Speed up hydration by reducing amount of element reorderings (#4308)
Fix escaping attribute values when using a spread in SSR (#5756)
Throw compiler error when :global() contains multiple selectors (#5907)
Give explicit error rather than crashing when an attribute shorthand {} is empty (#6086)
Make <textarea> end tag parsing more robust (#6276)
Fix :global(...):some-pseudoclass selectors not being seen as global (#6306)
Fix type signatures of writable and readable so it's possible to call them without arguments (#6291, #6345)
Preserve this in bubbled events (#6310)
Fix slot props not updating when transition is aborted (#6386)
Fix generic props relationship in SvelteComponentTyped (#6400)

3.38.2

Revert hydration optimisation for the time being (#6279)

3.38.1

Fix hydration regression (#6274)

3.38.0

Avoid recreating DOM elements during hydration (#1067)
Support passing CSS custom properties to component (#5628)
Support :global() as part of compound CSS selectors (#6222)
Fix updating <slot> contents when there's an aborted transition (#3542)
Fix setting boolean attributes on custom elements (#5951)
Add missing function overload for derived to allow explicitly setting an initial value for non-async derived stores (#6172)
Fix dynamic href values erroneously triggering a11y warnings (#5990)
Fix scope leak when updating an {#await} block (#6173)
Pass full markup source to script/style preprocessors (#6169)
Fix crossfade types to mark fallback as optional (#6201)
Add missing "context" typing to SvelteComponent constructor options (#6236)
Don't automatically switch to svg namespace when in foreign namespace (#6257)

3.37.0

Allow root-level context to be passed to the component constructor (#6032)

3.36.0

Add this: void typing to store functions (#6094)
Export Spring, Tweened and EasingFunction interfaces (#6070, #6056)
Export interfaces for transition parameters (#5207)
Export store's useful TypeScript definitions (#5864)
Fix previous breaking change to svelte/preprocess types location (#6100)
Fix missing slotted elements in AST (#6066)

3.35.0

Implement slotted components and <svelte:fragment slot="..."> (#1037, #2079)
Fix reactivity bug where slot="..." is specified after attributes that should be reactive (#5626)

3.34.0

Add a cssHash option for controlling the classname used for CSS scoping (#570)

3.33.0

In custom elements, call onMount functions when connecting and clean up when disconnecting (#1152, #2227, #4522)
Allow destructured defaults to refer to other variables (#5066)
Do not emit contextual-store warnings for function parameters or declared variables (#6008)

3.32.3

Fix removal of lone :host selectors (#5982)

3.32.2

Fix unnecessary additional invalidation with <Component bind:prop={obj.foo}/> (#3075, #4447, #5555)
Fix scoping of selectors with :global() and ~ sibling combinators (#5499)
Fix removal of :host selectors as unused when compiling to a custom element (#5946)

3.32.1

Warn when using module variables reactively, and close weird reactivity loophole (#5847)
Throw a parser error for class: directives with an empty class name (#5858)
Fix extraneous store subscription in SSR mode (#5883)
Don't emit update code for class: directives whose expression is not dynamic (#5919)
Fix type inference for derived stores (#5935)
Make parameters of built-in animations and transitions optional (#5936)
Make SvelteComponentDev typings more forgiving (#5937)
Fix foreign elements incorrectly disallowing bind:this (#5942)

3.32.0

Allow multiple instances of the same action on an element (#5516)
Support foreign namespace, which disables certain HTML5-specific behaviour and checks (#5652)
Support inline comment sourcemaps in code from preprocessors (#5854)

3.31.2

Rework SSR store handling to subscribe and unsubscribe as in DOM mode (#3375, #3582, #3636)
Fix error when removing elements that are already transitioning out (#5789, #5808)
Fix duplicate content race condition with {#await} blocks and out transitions (#5815)
Deconflict variable names used for contextual actions (#5834)

3.31.1

Fix scrolling of element with resize listener by making the <iframe> have z-index: -1 (#5448)
Fix location of automatically declared reactive variables (#5749)
Warn when using className or htmlFor attributes (#5777)
Fix checkbox bind:group in keyed {#each} where the array can be reordered (#5779)
Fix checkbox bind:group in nested {#each} contexts (#5811)
Add graphics roles as known ARIA roles (#5822)
Fix local transitions if a parent has a cancelled outro transition (#5829)
Support use:obj.some.deep.function as actions (#5844)

3.31.0

Use a separate SvelteComponentTyped interface for typed components (#5738)

3.30.1

Support consuming decoded sourcemaps as created by the source-map library's SourceMapGenerator (#5722)
Actually export hasContext (#5726)

3.30.0

Add a typed SvelteComponent interface (#5431)
Support spread into <slot> props (#5456)
Fix setting reactive dependencies which don't appear in the template to undefined (#5538)
Support preprocessor sourcemaps during compilation (#5584)
Fix ordering of elements when using {#if} inside {#key} (#5680)
Add hasContext lifecycle function (#5690)
Fix missing walk types in svelte/compiler (#5696)

3.29.7

Include ./register in exports map (#5670)

3.29.6

Include ./package.json in export map (#5659)

3.29.5

Fix $$props and $$restProps when compiling to a custom element (#5482)
Include an export map in package.json (#5556)
Fix function calls in <slot> props that use contextual values (#5565)
Fix handling aborted transitions in {:else} blocks (#5573)
Add Element and Node to known globals (#5586)
Fix $$slots when compiling to custom elements (#5594)
Fix internal imports so that we're exposing a valid ES module (#5617)

3.29.4

Fix code generation error with ?? alongside logical operators (#5558)

3.29.3

Hopefully actually republish with proper UMD build for use in the REPL

3.29.2

Republish with proper UMD build for use in the REPL

3.29.1

Fix compiler hanging on <slot slot="..."> (#5475)
Fix types on get function in svelte/store (#5483)
Add missing end field on ASTs for non-top-level <style> elements (#5487)
Fix {#if} inside {#await} with destructuring (#5508)
Fix types on lifecycle hooks (#5529)

3.29.0

Support <slot slot="..."> (#2079)
Fix unmounting components with a bidirectional transition with a delay (#4954)
Add types to get function in svelte/store (#5269)
Add a warning when a component looks like it's trying to use another component without beginning with a capital letter (#5302)
Add EventSource to known globals (#5463)
Fix compiler exception with ~/+ combinators and {...spread} attributes (#5465)

3.28.0

Add {#key} block for keying arbitrary content on an expression (#1469)

3.27.0

Add |nonpassive event modifier, explicitly passing passive: false (#2068)
Scope CSS selectors with ~ and + combinators (#3104)
Fix keyed {#each} not reacting to key changing (#5444)
Fix destructuring into store values (#5449)
Fix erroneous missing-declaration warning with use:obj.method (#5451)

3.26.0

Support use:obj.method as actions (#3935)
Support _ as numeric separator (#5407)
Fix assignments to properties on store values (#5412)
Add special style scoping handling of [open] selectors on <details> elements (#5421)
Support import.meta in template expressions (#5422)

3.25.1

Fix specificity of certain styles involving a child selector (#4795)
Fix transitions that are parameterised with stores (#5244)
Fix scoping of styles involving child selector and * (#5370)
Fix destructuring which reassigns stores (#5388)
Fix {#await}s with no {:catch} getting stuck unresolved if the promise rejects (#5401)

3.25.0

Use null rather than undefined for coerced bound value of <input type="number"> (#1701)
Expose object of which slots have received content in $$slots (#2106)
Correctly disallow using lifecycle hooks after synchronous component initialisation (#4259, #4899)
Re-throw an unhandled rejection when an {#await} block with no {:catch} gets a rejection (#5129)
Add types to createEventDispatcher (#5211)
In SSR mode, do not automatically declare variables for reactive assignments to member expressions (#5247)
Include selector in message of unused-css-selector warning (#5252)
Fix using <Namespaced.Component/>s in child {#await}/{#each} contexts (#5255)
Fix using <svelte:component> in {:catch} (#5259)
Fix setting one-way bound <input> value to undefined when it has spread attributes (#5270)
Fix deep two-way bindings inside an {#each} involving a store (#5286)
Use valid XHTML for elements that are optimised and inserted with .innerHTML (#5315)
Fix reactivity of $$props in slot fallback content (#5367)

3.24.1

Prevent duplicate invalidation with certain two-way component bindings (#3180, #5117, #5144)
Fix reactivity when passing $$props to a <slot> (#3364)
Fix transitions on {#each} {:else} (#4970)
Fix unneeded invalidation of $$props and $$restProps (#4993, #5118)
Provide better compiler error message when mismatched tags are due to autoclosing of tags (#5049)
Add a11y-label-has-associated-control warning (#5074)
Add a11y-media-has-caption warning (#5075)
Fix bind:group when using contextual reference (#5174)

3.24.0

Support nullish coalescing (??) and optional chaining (?.) operators (#1972)
Support import.meta (#4379)
Fix only setting <input> values when they're changed when there are spread attributes (#4418)
Fix placement of {@html} when used at the root of a slot, at the root of a component, or in <svelte:head> (#5012, #5071)
Fix certain handling of two-way bound contenteditable elements (#5018)
Fix handling of imported value that is used as a store and is also mutated (#5019)
Do not display a11y-missing-content warning on elements with contenteditable bindings (#5020)
Fix handling of this in inline function expressions in the template (#5033)
Fix collapsing HTML with static content (#5040)
Prevent use of $store at compile time when top-level store has been shadowed (#5048)
Update <select> with one-way value binding when the available <option>s change (#5051)
Fix published tweened types so the .set() and .update() options are optional (#5062)
Fix contextual bind:this inside {#each} block (#5067)
Preprocess self-closing <script> and <style> tags (#5080)
Fix types for animation- and transition-related param objects so each param is optional (#5083)

3.23.2

Fix bind:group inside {#each} (#3243)
Don't crash when using an arrow function as a statement (#4617)
Deconflict bind:this variable (#4636)

3.23.1

Fix checkbox bind:group when multiple options have the same value (#4397)
Fix bind:this to the value of an {#each} block (#4517)
Fix reactivity when assigning to contextual {#each} variable (#4574, #4744)
Fix binding to contextual {#each} values that shadow outer names (#4757)
Work around EdgeHTML DOM issue when removing attributes during hydration (#4911)
Throw CSS parser error when :global() does not contain a selector (#4930)

3.23.0

Update <select> with bind:value when the available <option>s change (#1764)
Add muted binding for media elements (#2998)
Fix inconsistencies when setting a two-way bound <input> to undefined (#3569)
Fix setting <select multiple> when there are spread attributes (#4392)
Fix let-less <slot> with context overflow (#4624)
Fix resize listening on certain older browsers (#4752)
Add a11y-no-onchange warning (#4788)
Fix use: actions being recreated when a keyed {#each} is reordered (#4693)
Fix {@html} when using tags that can only appear inside certain tags (#4852)
Fix reactivity when binding directly to {#each} context (#4879)

3.22.3

Support default values and trailing commas in destructuring {#await} (#4560, #4810)
Fix handling of tweened store when set using duration: 0 (#4799, #4846)
Fix setting value attribute with bind:group and attribute spread (#4803)
Fix issue with compound {#if} block involving static condition, dynamic condition, and inline component (#4840)
Update a11y warnings per ARIA 1.2 working draft (#4844)

3.22.2

Fix compiler exception with a11y-img-redundant-alt and value-less alt attribute (#4777)

3.22.1

Fix compiler exception with a11y-img-redundant-alt and dynamic alt attribute (#4770)

3.22.0

Fix misaligned line numbers in source maps (#3906)
Make setting a tweened store using duration: 0 instantly update the value (#4399)
Fix reactivity with imported values that are then mutated (#4555)
Fix contextual dynamic bind:this inside {#each} block (#4686)
Do not display a11y warning about missing href for <a> with name or id (#4697)
Disable infinite loop guard inside generators (#4698)
Display a11y-invalid-attribute warning for href="javascript:..." (#4733)
Implement a11y-img-redundant-alt warning (#4750)
Fix variable name conflict with component called <Anchor> (#4768)

3.21.0

Support dimension bindings in cross-origin environments (#2147)
Fix several related outro bugs (#3202, #3410, #3685, #4620, #4630)
Try using globalThis rather than globals for the benefit of non-Node servers and web workers (#3561, #4545)
Support {#await ... catch ...} syntax shorthand (#3623)
Fix attaching of JS debugging comments to HTML comments (#4565)
Fix <svelte:component/> within <slot/> (#4597)
Fix bug with updating simple {#if} blocks (#4629)
Fix issues with <input type="number"> updates (#4631, #4687)
Prevent illegal attribute names (#4648)
Fix {#if} block directly within <slot/> (#4703)

3.20.1

Fix compiler regression with slots (#4562)

3.20.0

Allow destructuring in {#await} blocks (#1851)
Allow <svelte:self> to be used in a slot (#2798)
Expose object of unknown props in $$restProps (#2930)
Prevent passing named slots other than from the top level within a component (#3385)
Allow transitions and animations to work within iframes (#3624)
Fix initialising slot fallbacks when unnecessary (#3763)
Disallow binding directly to const variables (#4479)
Fix re-attaching event handlers on keyed {#each} blocks (#4491)
Fix updating keyed {#each} blocks with {:else} (#4536, #4549)
Fix hydration of top-level content (#4542)

3.19.2

In dev mode, display a runtime warning when a component is passed an unexpected slot (#1020, #1447)
In vars array, correctly indicate whether module variables are mutated or reassigned (#3215)
Fix spread props not updating in certain situations (#3521, #4480)
Use the fallback content for slots if they are passed only whitespace (#4092)
Fix bitmask overflow for {#if} blocks (#4263)
In dev mode, check for unknown props even if the component has no writable props (#4323)
Exclude global variables from $capture_state (#4463)
Fix bitmask overflow for slots (#4481)

3.19.1

Do not treat modifications to $$props as updates to a store called $props (#4368)
Deconflict value parameter name used in contextual bindings (#4445)
Fix dev mode validation of {#each} blocks using strings (#4450)

3.19.0

Fix indirect bindings involving elements with spreads (#3680)
$capture_state/$inject_state now act on the component's entire state, rather than its props (#3822)
Warn when using <Foo/> and Foo is dynamic (#4331)
Display compilation warnings in svelte/register in dev mode (#4364)
Fix unneeded updating of keyed each blocks (#4373)
Throw runtime error in dev mode for non-array-like values in {#each} blocks (#4408)

3.18.2

Fix binding to module-level variables (#4086)
Improve parsing error messages when there is a pending unclosed tag (#4131)
Disallow attribute/prop names from matching two-way-bound names or {shorthand} attribute/prop names (#4325)
Improve performance of flush() by not using .shift() (#4356)
Permit reserved keywords as destructuring keys in {#each} (#4372)
Disallow reserved keywords in {expressions} (#4372)
Fix code generation error with precedence of arrow functions (#4384)
Fix event handlers that are dynamic via reactive declarations or stores (#4388)
Fix invalidation in expressions like ++foo.bar (#4393)

3.18.1

Fix code generation error with adjacent inline and block comments (#4312)
Fix detection of unused CSS selectors that begin with a :global() but contain a scoped portion (#4314)

3.18.0

Fix infinite loop when instantiating another component during onMount (#3218)
Make autosubscribing to a nullish store a no-op (#2181)

3.17.3

Fix updating a <slot> inside an {#if} or other block (#4292)
Fix using RxJS observables in derived stores (#4298)
Add dev mode check to disallow duplicate keys in a keyed {#each} (#4301)
Fix hydration of <title> when starting from SSR-generated code with hydratable: true (#4310)

3.17.2

Fix removing attributes during hydration (#1733)
Disallow two-way binding to a variable declared by an {#await} block (#4012)
Allow access to let: variables in sibling attributes on slot root (#4173)
Fix ~= and class selector matching against values separated by any whitespace characters (#4242)
Fix code generation for awaited expressions that need parentheses (#4267)
Preserve JavaScript comments from the original component source where possible (#4268)
Add some more known globals (#4276)
Correctly apply event modifiers to <svelte:body> events (#4278)

3.17.1

Only attach SSR mode markers to a component's <head> elements when compiling with hydratable: true (#4258)

3.17.0

Remove old <head> elements during hydration so they aren't duplicated (#1607)
Prevent text input cursor jumping in Safari with one-way binding (#3449)
Expose compiler version in dev events (#4047)
Don't run actions before their element is in the document (#4166)
Fix reactive assignments with destructuring and stores where the destructured value should be undefined (#4170)
Fix hydrating {:else} in {#each} (#4202)
Do not automatically declare variables in reactive declarations when assigning to a member expression (#4212)
Fix stringifying of attributes in SSR mode when there are spread attributes (#4240)
Only render one <title> in SSR mode when multiple components provide one (#4250)

3.16.7

Also apply actions in the order they're given along with other directives (#2446, #4156)
Check whether a dynamic event handler is a function before calling it (#4090)
Correctly mark event handlers as dynamic when they involve an expression used in a bind: elsewhere (#4155)

3.16.6

Fix CSS specificity bug when encapsulating styles (#1277)
Apply directives in the order they're given (#2446)
Fix destructuring in let: directives (#2751)
Preserve whitespace around <tspan>s in <svg>s (#3998)

3.16.5

Better fix for cascading invalidations and fix some regressions (#4098, #4114, #4120)

3.16.4

Fix slots with props not propagating through to inner slots (#4061)
Fix noting autosubscribed stores as referenced in vars for tooling (#4081)
Fix cascading invalidations in certain situations (#4094)

3.16.3

Fix bitmask overflow when using slotted components (#4077)
Remove unnecessary $$invalidate calls from init block (#4018)

3.16.2

Handle slot updates when parent component has a bitmask overflow (#4078)

3.16.1

Fix unused export warning for props used as stores (#4021)
Fix {:then} without resolved value containing {#each} (#4022)
Fix incorrect code generated with loopGuardTimeout (#4034)
Fix handling of bitmask overflow and globals (#4037)
Fix {:then} containing {#if} (#4044)
Fix bare imports in format: 'cjs' output mode (#4055)
Warn when using a known global as a component name (#4070)

3.16.0

Use bitmasks to track changes (#3945)
Fix heisenbug with component styles (#3977)
Do not warn about missing expected props for export function foo() {} (#3954)
Fix context="module" exports with the same name as an instance variable (#3983)
Fix binding to contextual values from {#each} blocks referring to global variables (#3992)
Use requestAnimationFrame callback argument for smoother transitions (#4014)
Fix listen_dev argument order (#4016)

3.15.0

Hide commented sections from preprocessors (#3894)
Add seeking and ended bindings to media elements (#3650)
Add videoWidth and videoHeight bindings to video elements (#3927)
Fix for dynamic event handlers (#3934)
Handle scale transforms when using the flip animation (#3555)
Fix some code generation bugs (#3929, #3939)
Add aria-hidden="true" to objects generated when adding resize-listeners, to improve accessibility (#3948)

3.14.1

Deconflict block method names with other variables (#3900)
Fix entity encoding issue in text nodes with constant expressions (#3911)
Make code for unknown prop warnings compatible with older js engines (#3914)

3.14.0

Add loopGuardTimeout option that augments for/while loops to prevent infinite loops, primarily for use in the REPL (#3887)
Keep component bindings in sync when changed in reactive statements (#3382)
Update attributes before bindings (#3857)
Prevent variable naming conflict (#3899)

3.13.0

New structured code generation, which eliminates a number of edge cases and obscure bugs (#3539)

Also:

Fix {#each} context not shadowing outer scope when using bind: (#1565)
Fix edge cases in matching selectors against elements (#1710)
Fix several bugs related to interaction of {...spread} attributes with other features (#2721, #2916, #3421, #3681, #3764, #3790)
Allow exiting a reactive block early with break $ (#2828)
Fix binding to props that have been renamed with export { ... as ... } (#3508)
Fix application of style scoping class in cases of ambiguity (#3544)
Check attributes have changed before setting them to avoid image flicker (#3579)
Fix generating malformed code for {@debug} tags with no dependencies (#3588)
Fix generated code in specific case involving compound ifs and child components (#3595)
Fix bind:this binding to a store (#3591)
Use safer HTMLElement check before extending class (#3608)
Add location as a known global (#3619)
Support {#await} with {:catch} but no {:then} (#3623)
Clean up dead code emitted for <slot/>s (#3631)
Fix tracking of dependencies of compound assignments in reactive statements (#3634)
Flush changes in newly attached block when using {#await} (#3660)
Throw exception immediately when calling createEventDispatcher() after component instantiation (#3667)
Fix globals shadowing contextual template scope (#3674)
Fix <svelte:window> bindings to stores (#3832)
Deconflict generated var names with builtins (#3724)
Allow spring/tweened values to be initially undefined (#3761)
Warn if using <svelte:options tag="..."> without customElement: true option (#3782)
Add Event to list of known globals (#3810)
Throw helpful error on empty CSS declaration (#3801)
Support easing param on fade transition (#3823)
Generate valid names from filenames with unicode characters (#3845)
Don't generate any code for markup-less components (#2200)
Deconflict with internal name block (#3854)
Set attributes before bindings, to prevent erroneous assignments to input.files (#3828)
Smarter unused CSS detection (#3825)
Allow dynamic event handlers (#3040)
Prevent erroneous "undefined" class name (#3876)
Prevent resetting of src attribute unless changed (#3579)
Prevent hydration of void element 'children' (#3882)
Hoist globals even if mentioned in <script> block (#3745)

3.12.1

Escape @ symbols in props, again (#3545)

3.12.0

Fire events on document in development to facilitate dev tooling (#3005)
Remove old props when the keys in spread props are removed (#2282)

3.11.0

$capture_state and $inject_state HMR hooks in dev mode (#3148)
Allow unclosed tags inside if/each/etc blocks (#2807)
Invalidate unreferenced store values inside <script> (#3537)
Print null text when hydrating (#3379)

3.10.1

Preserve reactivity inside if block heads etc (#3512)
Fix store bindings inside each blocks (#3455)
Generate correct code for if-else blocks with static conditions (#3505)
Avoid generating unnecessary component update code (#3526)
Make bind:currentTime more reliable (#3524)
Prevent errors when setting spread props on SVG elements (#3522)

3.10.0

Add blur transition (#3477)
Prevent <input type="number"> edge case with spread props (#3426)
Robustify cyclical dependency detection, improve errors (#3459)

3.9.2

Fix handling of additional @-rules in style blocks (#2995)
Fix if blocks with complex but static conditions (#3447)

3.9.1

Only update style properties if necessary (#3433)
Only update if/await blocks if necessary (#2355)
Set context correctly inside await blocks (#2443)
Handle !important inline styles (#1834)
Make index references reactive in event handlers inside keyed each blocks (#2569)

3.9.0

Support is attribute on elements, with a warning (#3182)
Handle missing slot prop (#3322)
Don't set undefined/null input values, unless previous value exists (#1233)
Fix style attribute optimisation bailout (#1830)

3.8.1

Set SVG namespace for slotted elements (#3321)

3.8.0

Add self event modifier (#3372)
Generate valid code when spreading literal (#3185)
Coerce tag values to string before checking equality (#2290)

3.7.1

Assume let variables are dynamic for slots (#3354)
Allow transition functions to return nothing (#2246)

3.7.0

Disable warnings via svelte-ignore comments (#3351)
Throw if $ or $$... is referenced as global (#3272)
Remount HTML tags correctly (#3329)
Treat data attributes like other attributes (#3337)

3.6.11

Handle reassigned RxJS observables (#3304)
Remove commas from HTMLified attributes with multiple chunks (#3341)
Prevent class on element with scoped styles from rendering as undefined (#3283)
Allow references to index in key expression (#3274)
Mark attribute selectors as used if corresponding binding exists (#3281)
Preserve async/* when hoisting functions (#3179)
Make raf a noop on server (#3324)
Prevent erroneous a11y warning for image input with alt attribute (#3331)
Add several well-known globals (#3316)

3.6.10

Use change event for file inputs (#3226)
Always fire reactive declarations with $$props (#3286)
More conservative spread prop updates (#3289)
Quote props if necessary in SSR mode (#3312)

3.6.9

Always update derived stores with a derived input whose value does not change (#3191)

3.6.8

Preserve global keyframes that don't match local elements (#3228)
Fix spread/class: combination (#3242)
Never scope :root selector (#3250)
Prevent trailing commas in function arguments (#3255)

3.6.7

Prevent corruption of outro callbacks with nested keyed each blocks (#3209)
Prevent cursor jumping in bound input in Safari (#3199)
Make resize listener object unfocusable (#3206)

3.6.6

Prevent dynamic components being detached twice (#3113, #2086)

3.6.5

Handle RxJS-style observables with get (#3153)
Pass let values to bindings (#3140)
Escape @ symbols in props (#3173)
Scale crossfaded elements (#3175)

3.6.4

Run onMount functions in correct order, and before initial afterUpdate functions (#2281)
Fix code transformation for shorthand methods (#2906)
Fix assignments in inline functions (#3038)

3.6.3

Fix await block mounting inside removed if block (#1496)
Update when element references are removed (#2034)
Don't attempt to serialize non-string values in server-rendered bindings (#2135)
Recognise dependencies in function expressions (#2693)
Scope pseudo-class selectors without class/type (#1705)
Allow nested at-rules (#3135)
Allow attributes to contain = characters (#3149)

3.6.2

Fix placement of each-else block (#2917)
Make context accessible to bind:this (#2806)
Pass hoisted values to slots (#2586)

3.6.1

Fix escaping of @ in dev mode debug filename (#3114)

3.6.0

Add innerHTML and textContent bindings for contenteditable elements (#2996)
Fix destructuring assignments where targets are member expressions (#3092)
Deconflict with used globals (#2963)
Always run onDestroy functions, not just for detaching components (#3058)
Fix scope analysis around catch clauses (#3064)
Add error constructors to known globals (#3064)
Always bail out of hoisting on encountering local state in function definition (#3044)
Fix incorrect merging of top-level text nodes (#3027)
Handle removal of components in each blocks without props (#3035)
Only call subscriber once when resubscribing to a store (#3022)
Check for existence of dynamic component before introing (#3054)
Sanitize names of bubbled event handlers (#2923)

3.5.4

Preserve whitespace at the boundaries of {#each} blocks (#713)
Fix dynamic bind:this on components (#2333)
Fix binding to values in a component when it uses $$props (#2725)
Fix parsing ambiguous HTML entities (#3071)

3.5.3

Don't double-destroy keyed each blocks with outros (#3055)

3.5.2

Prevent duplicated outros causing errors (#3001)
Fix automatic name generation (#2843)
Fix .d.ts stubs (#3009)
Don't strip non-breaking spaces (#3014)
Fix requestAnimationFrame context (#2933)
Allow space before attribute value (#3026)
Remove null/undefined attributes (#1434)
Fix whitespace in static markup (#3030)

3.5.1

Accommodate webpack idiosyncracies

3.5.0

Update package folder structure (#2887)
Support once modifier on component events (#2654)
Allow empty <title> tags (#2980)
Render textarea binding values inside element (#2975)
Fix delayed animation glitch (#2871)
Solve diamond dependencies problem with stores (#2660)
Fix missing outros inside each blocks (#2689)
Support animations without transitions (#2908)
Add missing transition events (#2912)

3.4.4

Publish type declaration files (#2874)
Don't trigger updates for unreferenced values (#2865)
Omit readonly bindings from SSR output (#2339)
Prevent outdated animation CSS (#2871)
Repair dynamic {@html ...} in head (#2880)
Don't create unknown prop warnings for internal props, or if component has $$props (#2881)

3.4.3

Add type declaration files for everything (#2842)
Prevent svelte/store being bundled (#2786)
Warn on unknown props in dev mode (#2840)
Treat requestAnimationFrame as a no-op on the server (#2856)
Add raw property to AST's Text nodes (#2714)
Add <details bind:open> (#2854)

3.4.2

Use empty string for empty data attributes (#2804)
Support customElement: true with no <svelte:options> (#2821)
Add docstrings to svelte/store (#2795)

3.4.1

Handle non-falsy non-function return values from derivers (#2780)
Allow spring to work server-side (#2773)

3.4.0

Allow custom element to be defined without a tag (#2417)
Fix parsing of quote marks inside attribute values (#2715)
Convert svelte/store to TypeScript (#2733)
Allow debug tags to include hoisted values (#2764)
Parse error if attribute name is missing = (#1513)
Allow reactive declarations to depend on mutated const values (#2728)

3.3.0

Allow multiple event listeners on a single node (#2688)
Allow derivers to return a cleanup function (#2553)
Support namespaced components (<Foo.Bar/>) (#2743)

3.2.2

Add window and document to expected globals (#2722)
Prevent hoisting of functions that depend on reactive state (#2703)
Generate correct code when slot has no changes (#2697)
Prevent Object.prototype-related bugs (#2696)

3.2.1

Use same comparison logic for derived as for other stores (#2644)
Invalidate dependencies of reactive declarations (#2444)
Fix instrumentation of auto-subscription self-assignments (#2681)
Warn on non-top-level or module-context statements labeled with $: (#2176)

3.2.0

Improve spring animations, and add hard/soft options (#2627)
Expose parse and walk functions (#2661, #2534)
Support array/object rest in each block destructuring patterns (#2647, #2658)
Use setAttribute to change form property on form elements (#1742)
Fix a11y warning when <figcaption> is non-direct descendant of <figure> (#2582)
Squelch erroneous 'empty block' warnings (#1716)
Fix IE9/10 error with insertBefore (#2573)
Prevent $$scope from being spread onto an element (#2520)
Resubscribe to stores that are assigned to in <script> (#2435)
Allow reactive declarations to depend on const variables (#2285)
Trigger store changes on UpdateExpression (#2625)
Squelch missing prop warning if variable is initialised (#2635)
Add alert, confirm and prompt to known globals (#2648)

3.1.0

Allow store subscribe functions to return an object with an unsubscribe method, providing native RxJS support (#2549)

3.0.1

Prevent text input cursor jumping in Safari (#2506)
Allow assignments to member expressions (#2510)
Prevent mutually dependent functions causing an infinite during hoisting (#2542)
Reuse scheduler promise instead of creating new one each time (#2555)
Various site/docs fixes

3.0.0

Everything

2.15.4

IE classList fix (#1868)

2.15.3

Don't mutate AST

2.15.2

Expose stats.props (#1837)

2.15.1

Don't throw missing store error when store is declared in component (#1828)

2.15.0

Event modifiers (#1088)
Wheel and touch events are passive by default (#1088)
Add <svelte:document> tag (#1484)
Include binding values in server-rendered HTML (#1205)
Remove attributes when value is undefined/null (#1434)
Initialise window scroll from component data (#938)
Remove references to unused properties in generated code (#1187)
Add TypeScript definitions for store (#1207)
Better error for missing store (#1807)

2.14.3

Account for directive dependencies (#1793)
Detach each block iterations in each blocks with no update method (#1795)

2.14.2

Fix issue with nested {#if} blocks (#1780)

2.14.1

Fix block insertion order regression (#1778)
Fix blocks inside <svelte:head> (#1774)
Better attribute parsing (#1772)
Fix parse errors inside directives (#1788)

2.14.0

Refactor internals (#1678)
Deprecate onerror option (#1745)
Handle edge cases where destroy is called before mount (#1653)
Make scroll binding more efficient (#1579)
Make 'readonly property' store error more informative (#1761)

2.13.5

Fix missing dependencies in shorthand class directives (#1739)

2.13.4

Support dynamic import() in template expressions

2.13.3

Fix bug with keyed each blocks and nested components (#1706)

2.13.2

Coalesce simultaneous store/component updates (#1520)
Fix nested transitions preventing each block item removal (#1617)
Add class directive shorthand and encapsulate styles (#1695)
Prevent erroneous updates of bound inputs (#1699)

2.13.1

Coerce second argument to toggleClass (#1685)

2.13.0

Add class directive (#890)
Remove sourcemaps from npm package (#1690)

2.12.1

Allow actions to take any expression (#1676)
Run transitions in component context (#1675)
Correctly set select value on mount (#1666)
Support {@debug} in SSR (#1659)
Don't treat   as empty whitespace (#1658)
Fix outros for if blocks with no else (#1688)
Set style.cssText in spread attributes (#1684)

2.12.0

Initialise actions on mount rather than hydrate (#1653)
Allow non-existent components to be destroyed (#1677)
Pass AMD ID from CLI correctly (#1672)
Minor AST tweaks (#1673, #1674)
Reduce code duplication in component initialisation (#1670)

2.11.0

Add --shared CLI option (#1649)
Run first onstate before fragment is rendered (#1522)
Exclude current computed prop from state object (#1544)

2.10.1

Add sourcemaps to {@debug} tags (#1647)

2.10.0

Add a {@debug} tag, for inspecting values in templates in dev mode (#1635)
Fix dimension bindings in iOS (#1642)

2.9.11

Pass props to custom elements rather than setting attributes, where appropriate (#875)
Handle whitespace in lists consistently between SSR and DOM renderers (#1637)
Improve error for invalid ref names (#1613)

2.9.10

Handle null consistently in tags (#1598)
Support object rest in computed properties (#1540)
Always update dynamic components when expression changes (#1621)
Encapsulate local styles inside global styles (#1618)

2.9.9

Fix attribute name regex (#1623)

2.9.8

Sanitize spread attributes in SSR — fixes vulnerability CVE-2018-6341 (#1623)

2.9.7

Allow <input type=file bind:files> (#1608)
Ensure child window exists before removing listener in addResizeHandler (#1600)
Handle transitions in else block (#1589)

2.9.6

Provide more useful error if SSR component attempts to render non-SSR component (#1605)

2.9.5

Null out refs to dynamic components (#1596)

2.9.4

Make identifier optional for then and catch blocks (#1507)
Group outros correctly (#1575)

2.9.3

Fix bug when an each block contains transitions but its else branch does not (#1559)
If an event handler throws an exception, don't block all future calls to that handler (#1573)

2.9.2

Fix conflict when using multiple if-else blocks, some of which use outros and some of which do not (#1580)
Fix some cases where .innerHTML was being used to create child elements when it shouldn't (#1581)

2.9.1

Use template.content instead of template where appropriate (#1571)

2.9.0

Play outro transitions on <svelte:component> if nestedTransitions is true (#1568)
Allow illegal identifiers to be component prop names, for e.g. spreading data-foo props (#887)
Abort transition when node is detached (#1561)
Only include transitionManager when necessary (#1514)

2.8.1

Fix prefixed animation name replacement (#1556)

2.8.0

Correctly set store on nested components (to parent store, not root store) (#1538)

2.7.2

Prevent unnecessary remounts (#1527)
Allow refs.* as callee (#1526)
Handle empty lists when outroing (#1532)

2.7.1

Fix spread props with multiple dependencies (#1515)

2.7.0

Add __svelte_meta object to elements in dev mode, containing source info (#1499)
Fix bind:online in dev mode (#1502)
Update v1 warnings/errors (#1508)
Transform prefixed keyframes (#1504)

2.6.6

Fix nested transition bug (#1497)

2.6.5

Handle cases where only some if block branches have outros (#1492)

2.6.4

Web worker support (#1487)
Update dynamic component bindings when component changes (#1489)

2.6.3

Nested transitions respect skipIntroByDefault (#1460)
Always create outro for top-level block (#1470)

2.6.2

Fix spread+bindings on dynamic components (#1433)
Abort in-progress animations, if a new one starts (#1458)
Allow animations to be parameterised (#1462)

2.6.1

Absolutely position outroing animated nodes (#1457)

2.6.0

Add animate directive (#1454)
Add skipIntroByDefault compiler option and intro: true init option (#1448)
Add nestedTransitions compiler option (#1451)
Component outros, if nestedTransitions is true (#1211)
Allow transition functions to return a function, for inter-transition coordination (#1453)
Pass 1 - t as second argument to transition functions (#1452)

2.5.1

Add new ARIA attributes (#1436)
Add Promise to whitelisted globals (#1441)
Allow spaces around reserved keyword attributes (#1445)

2.5.0

Support transitions in await blocks (#956)
Abort outros if block is recreated (#1425)
Wait until transitions have completed before removing styles (#648)
Support event shorthand on dynamic components (#1427)
Various codegen improvements (#1419, #1421, #1422, #1424)
Correctly handle await blocks with no dynamic content (#1417)
Allow spread props on elements with static attribute tests (#1429)

2.4.4

Declare missing variable in Store (#1415)
ALways declare spread levels (#1413)

2.4.3

ref directives prevent HTMLified content (#1407)
Store computed properties update components immediately upon declaration (#1327)

2.4.2

Evaluate each key in child scope (#1397)
Prevent false negatives and positives when detecting cyclical computed store properties (#1399)
Only update dynamic component props (#1394)

2.4.1

Fix DOM event context (#1390)

2.4.0

Integrate CLI (#1360)
Allow arbitrary destructuring for each block items, with binding (#1385)
Each block keys can use arbitrary expressions (#703)
bind:offsetWidth, bind:offsetHeight, bind:clientWidth and bind:clientHeight (#984)
Leaner generated code for each blocks (#1287)

2.3.0

Allow computed properties to have entire state object as dependency (#1303)
Fix stats when options.generate is false (#1368)
Assign custom methods to custom elements (#1369)
Fix this value in custom event handlers (#1297)
Re-evaluate each values lazily (#1286)
Preserve outer context in await blocks (#1251)

2.2.0

Internal refactoring (#1367)

2.1.1

Report initial changed based on state, not expected props (#1356)
Set state to empty object, not null, on destroy (#1354)
Prevent stale state in component event handlers (#1353)

2.1.0

Allow shorthand imports (#1038)
Update spread props inside each blocks (#1337)

2.0.0

See the blog post for information on how to upgrade your apps

New template syntax (#1318)
Emit ES2015 code, not ES5 (#1348)
Add onstate and onupdate hooks, remove component.observe method (#1197)
Use destructuring syntax for computed properties (#1069
Change signature of svelte.compile (#1298)
Remove validate and Stylesheet from public API (#1348)
Don't typecast numeric attributes (#657)
Always compile with Store support, and cascading disabled (#1348)
Remove unused hash property from AST (#1348)
Rename loc property to start in warnings and errors (#1348)

1.64.1

Fix computed properties in SSR renderer (#1349)

1.64.0

Deprecate passing a string argument to component.get (#1347)

1.63.1

Allow observe method to be overwritten

1.63.0

Add onstate and onupdate lifecycle hooks and deprecate component.observe (#1197)
Add on and fire to Store, deprecate onchange and observe (#1344)
Require computed properties to have destructured argument in v2 mode (#1069)

1.62.0

Add a code field to errors and warnings (#474)
When using v2 syntax, do not use interpolation in non-root <style> tags (#1339)

1.61.0

Support v2 syntax with parser: 'v2' option (#1318)

1.60.3

Fix validation of multiple attributes on bound <select> elements (#1331)

1.60.2

Fix order of insertions for keyed each blocks with siblings (#1306)
Bail out of CSS DCE if element has spread attribute (#1300)
Allow console etc in component events (#1278)
Deconflict against inherited contexts (#1275)
Make CSS DCE case insensitive (#1269)
Error on dynamic multiple attribute for bound select (#1270)
Allow custom events on <:Window> (#1268)

1.60.1

Fix spread updates on dynamic components (#1307)

1.60.0

Spread properties (#195)
svelte.compile returns an object with { js, css, ast } properties, where js and css are { code, map } objects (#1298)
Fixed broken compile errors when using Rollup (#1296)

1.59.0

Deprecate teardown in custom event handlers (#531)
Allow static content in keyed each block (#1291)
Allow empty content in keyed each block (#1295)
Only delete applicable transitions (#1290)

1.58.5

Allow backtick string literals for svg, tag, and props properties (#1284)
Fix removal of transition styles under Firefox (#1288)

1.58.4

Fix initial state regression (#1283)

1.58.3

Actions run in the context of the component (#1279)
Set refs when mounting dynamic components (#1280)

1.58.2

(1.58.1 failed to publish)

1.58.1

Actions (#1247)
Support preserveComments option in SSR mode (#1265)
Fix performance regression (#1274)

1.58.0

Fast row swapping (#588)
Better error messages for invalid directives (#1242)
Fix local context variable bugs (#1240, #1254)
Skip missing property warnings for computed/global properties in dev mode (#1246)
Add end position to warnings (#1250)

1.57.4

Deconflict context names (#1229)
Use setAttribute to set input types (#1209)
Scale transition duration correctly (#1221)

1.57.3

Fix scoped CSS on static child elements (#1223)

1.57.2

Fix scoped CSS on SVG elements (#1224)

1.57.1

Add each_value to contextProps (#1206)

1.57.0

Use classes (not attributes) for style encapsulation, and base36-encode hashes (#1118)

1.56.4

Allow component and state to be context names (#1213)
Don't remove @supports rules when cascade: false (#1215)

1.56.3

Top-level transitions work inside nested components (#1188)
Always use internal _mount method (#1201)

1.56.2

Null out key for children of keyed each blocks (#1202)

1.56.1

Fix if-in-each bug (#1195)
Cross-browser scrollX/scrollY support (#1175)

1.56.0

Internal refactor (#1122)
Use correct context for component events (#1184)
Allow observing $foo in dev mode (#1181)
Handle dynamic data in default slot (#1144)

1.55.1

Fix cancellation of store onchange handlers (#1177)
Write ["default"] instead of .default in legacy mode (#1166)
Upgrade Acorn (#1182)
Don't warn about capitalisation if options.name begins with non-alphabetical character (#1179)

1.55.0

Add immutable compiler option for Svelte and runtime option for Store (#1146)
Fix component store bindings (#1100)
Fire oncreate when custom element is attached (#1117)
Downgrade empty blocks to a warning (#1156)
Error on unclosed comment (#1156)

1.54.2

Prevent await blocks using stale state (#1131)
Prevent erroneous missing data warnings for custom elements (#1065)
Remove empty selectors in prod mode (#1138)
Escape attribute values in SSR mode (#1155)
Remove <noscript> elements in DOM mode (#1108)
Allow hydration of non-root <script>/<style> tags (#1163)
Allow interpolation in non-root <style> tags (#1163)

1.54.1

Hoist destructured references (#1139)
Add bind:volume for media elements (#1143)

1.54.0

Run oncreate hooks depth-first, top-to-bottom (#1135)
Render boolean attributes correctly in SSR mode (#1109)
Add feed aria role to expected roles when doing a11y checks (#1124)
More complete fix for case sensitive attributes (#1062)
Handle CLRF line endings in await block comments (#1132)

1.53.0

Base scoping selectors on <style> contents alone (#1091)

1.52.0

Deconflict referenced globals (#1079)
Validate contents of await blocks (#1061)
Fire oncreate for components in await blocks (#1061)
Automatically fix attribute casing (#1062)
Fix escaping in <script> and <style> (#1082)
Error if invalid characters are used in computed properties, and allow any valid identifier in props (#1083)
Don't run a11y tests on components (#1110)
Respect store option in SSR mode (#1107)

1.51.1

Only escape <, > and & characters (#1082)

1.51.0

Lock scroll bindings (#1071)
Escape HTML entities when compiling to static HTML (#1066)
Apply a11y warnings to SVG <a> attributes with xlink:href (#1008)

1.50.1

Prevent main fragment being created twice in custom elements (#1064)

1.50.0

Detect unused/misplaced components (#1039)
Warn on unused event definitions/transitions (#1051)
Remove whitespace inside <:Head> (#1026)
Optimise <title> (#1027)
Add bind: false option to disable two-way binding (#54)

1.49.3

Return html from SSR compiler render().toString() methods (#1044)
Correctly reinitialise dynamic components (#1040)
Allow <option> outside <select> (#1022)
Fix data references in await-block event handlers (#1032)

1.49.2

Add store.umd.js (#967)
Warn on use of this inside computed properties (#1033)

1.49.1

Pass store to children in SSR mode (#1029)

1.49.0

Support store as a component property (#1028)

1.48.0

Added <:Head> component for injecting contents into document head (#1013))
SSR render(...) method now returns a { html, css: { code, map }, head } object (#1013)
SSR renderCss(...) method is deprecated (#1013)
Add a preload function to components (#1015)
Expose this.root on nested components (#1023)

1.47.2

Deconflict computed properties against arguments to _recompute (#1012)
Allow await blocks in slots (#1018)
Allow components without slots to have whitespace as only child (#1007)
Correctly set toString on CompileError (#1016)

1.47.1

Sanitize filenames in SSR mode (#1005)

1.47.0

Support dynamic import(...) inside <script> tags (#1003)

1.46.1

await...then shorthand (#957)
Allow dynamic components inside elements (#993)
Don't use dataset on SVG nodes (#982)
Fix erroneous <figcaption> a11y warning (#991)
Handle empty classes when pruning unused selectors (#978)
Better trimming of SSR'd output (#976)
Don't add event to expectedProperties (#972)
Emit error on bad set arguments in dev mode (#990)

1.46.0

Pass filename through to preprocessors (#983)

1.45.0

Dynamic components (#971)

1.44.2

Fix await blocks with siblings (#974)
Fix await blocks inside if blocks (#975)

1.44.1

Fix bidirectional transitions that reference state (#962)

1.44.0

Add svelte.preprocess (#181, #876)
Add {{#await ...}} blocks (#654)

1.43.1

Fix parameterised transitions (#962)
Prevent boolean attributes breaking estree-walker expectations (#961)
Throw error on cyclical store computations (#964)

1.43.0

Export Store class to manage global state (#930)
Recognise aria-current (#953)
Support SSR register options including extensions (#939)
Friendlier error for illegal contexts (#934)
Remove whitespace around <:Window> components (#943)

1.42.1

Correctly append items inside a slotted each block (#932)
Fix <:Window bind:online/> (#936)
Attach globals to state upon initialisation (#908)

1.42.0

Implement indeterminate binding for checkbox inputs (#910)
Use <option> children as value attribute if none exists (#928)
Allow quoted property names in default export and sub-properties (#914)
Various improvements to generated code for bindings

1.41.4

Handle self-destructive bindings (#917)
Prevent innerHTML with <option> elements (#915)
Use dataset unless legacy is true (#858)
Add prepare script to facilitate installing from git (#923)

1.41.3

Prevent argument name clashes (#911)
Fix UMD factory arguments (#918)
Don't attempt to set computed values (#893)
Fix TypeScript build error (#919)

1.41.2

Handle attribute selectors with no value (#905)
Retain async keyword when extracting functions (#904)
Shallow clone data on initialisation (#891)

1.41.1

Fix updates of destructured each blocks (#897)
Don't warn on options.* event handler callee (#900)

1.41.0

onwarn and onerror receive default handlers as second arguments (#883)
Recognise muted as boolean property on <audio> elements (#886)
Array destructuring for each block contexts (#889)

1.40.2

Ignore @apply and similar in CSS (#871)
Properly escape CSS in custom elements (#872)

1.40.1

Always use explicit closing tags with innerHTML (#866)
Escape text in textContent and innerHTML expressions (#868)

1.40.0

Short fragment method names (#863)
Extract declarations out of default export (#756)

1.39.4

Extract shared init logic (#855)
Allow console.* calls in event handlers (#782)
Marker comments in output (#823)
Use textContent and innerHTML where appropriate (#23)
Various improvements to generated code

1.39.3

Allow slot='...' inside custom elements (#827)
Disallow slot='...' inside if/each blocks (#849)
Use correct parent node for slotted if blocks (#850)

1.39.2

Escape CSS in shadow DOM (#840)
Fix missing anchor bug inside SVG elements (#843)

1.39.1

Always use anchors for slotted content (#822)
Prevent ES6 in helpers (#838)
Correctly determine whether to use timeRangesToArray (#837)

1.39.0

Always attach fragment to shadow root (#821)
Add buffered, seekable, played bindings to media elements (#819)
Quote class properties in legacy mode (#830)
Warn on missing lang attribute on <html> (#828)

1.38.0

Compile-time a11y warnings (#815)
Remove redundant input blowback guards (#645)
Use component name in debugging messages (#781)

1.37.0

Experimental support for compiling to custom elements (#797)

1.36.0

Optimize style attributes where possible (#455)

1.35.0

set and get continue to work until destroy is complete (#788)
Observers of unchanged bound values don't fire incorrectly (#804)
Nested components with slotted content render correctly in SSR mode (#801)
More efficient rendering of raw and slotted content (#637)
Handle unquoted attributes in attribute selectors (#798)

1.34.0

Support nested <slot> elements (#790)
Attach options to instance (#550, #777)
Error if transitions are applied to component (#791)
Handle CSS variables in <style> tag (#757)

1.33.0

Replace {{yield}} with <slot> — adds fallback content named slots, and options.slots (#763)

1.32.0

Allow anchor initialisation option, alongside target (#784)
Remove leading CSS selectors safely (#783)

1.31.0

Add legacy compile option, which adds IE9 compatibility (#773)

1.30.0

Update all component bindings simultaneously (#760)
Fix @keyframes atrules with from and to selectors (#774)

1.29.3

Only recompute tag and attribute values if they could have changed (#768)
Fix CSS scoping with multiple levels of descendant selectors (#767)

1.29.2

Preserve space before non-parenthesized media query expression (#759)
Call create() on new iterations of static each blocks (#762)
Use change events as well as input events to bind range inputs (#740)

1.29.1

Replace set and destroy with noop when component is destroyed (#744)

1.29.0

Add static setup method (#578)
Hoist if block selectors (#751)
More sigil escaping fixes (#750)

1.28.1

Fix unescaping of special words in SSR mode (#741)

1.28.0

Support ref:foo as a CSS selector (#693)
Prevent magic-string bugs by only minifying CSS combinators if cascade: false (#743)
Don't throw an error if component is destroyed twice (#643)

1.27.0

Minify CSS and remove unused styles (#697)
Optimize ternary expressions when excluding unused CSS (#696)
Clear refs after ondestroy callbacks fire (#706)
Prevent certain forms of component binding blowback (#721)
Use helper to encapsulate styles (#375)
Event propagation shorthand — on:foo equals on:foo='fire("foo", event) (#638)
Allow refs.* in event handlers, and validate them (#686)

1.26.2

Unescape # characters (#722)

1.26.1

Fix select binding regression (#724)

1.26.0

Enforce correct order of operations when initialising (#708 and #714)
Ensure data is up-to-date when re-rendering yield block (#711)
Fix unescaping of strings, preserve at-rules in CSS (#712)
Preserve whitespace at end of each blocks (#713)

1.25.1

Better CSS sourcemaps (#716)

1.25.0

Fix hoisted event handlers (#699)
Fire intro.start and outro.start events (#702)
Preserve order of components in keyed each blocks (#700)
Add cssMap property to compiler output (#698)

1.24.0

Deconflict names with imports in SSR compiler (#655)
Improved transition performance (#670)
Run transitions on initial render (#651)
Add dev mode warning if hydrate is true but hydratable was false (#664)
Manipulate sourcemap to make missing loop values obvious (#683)
Only add CSS scoping attributes where necessary (#679)
Warn on unused CSS selectors (#678)
Fix <select> binding in loop (#685)
Prevent bindings from calling oncreate functions prematurely (#694)
Simpler codegen (#673)

1.23.4

Don't recreate if blocks incorrectly (#669)

1.23.3

Pass parameters to get_block (#667)

1.23.2

Fix if blocks being recreated on update (#665)

1.23.1

Fix each-else blocks that are empty on initial render (#662)

1.23.0

Hydration (#649)
Correctly transform CSS selectors with pseudo-elements (#658)

1.22.5

Fix nested component unmounting bug (#643)

1.22.4

Include ast in svelte.compile return value (#632)
Set initial value of <select> binding, if unspecified (#639)
Mark indirect dependencies of <select> bindings (i.e. the dependencies of their <option> values) (#639)

1.22.3

Fix nested component unmounting bug (#625)
Allow components to have computed member expression bindings (#624)
Handle empty <style> tags (#634)
Warn on missing component (#623)
Allow dynamic type attribute for unbound inputs (#620)
Rename addEventListener and removeEventListener directives (#621)

1.22.2

Escape template strings correctly in SSR output (#616)
Prevent magic-string deprecation warning (#617)

1.22.1

Sanitise event handler names (#612)

1.22.0

Symmetry between mount and unmount. This is potentially a breaking change if your components import other components that were precompiled with an earlier version of Svelte (#592)
Add cascade option, which prevents styles affecting child components if false, unless selectors are wrapped in :global(...) and keyframe declaration IDs are prefixed with -global-. This will become the default behaviour in v2 (#583)
Support binding to computed member expressions (#602)
Coerce empty string in number/range inputs to undefined, not 0 (#584)
Fix insert location of DOM elements in each/if/nested component edge cases (#610)

1.21.0

Always use helpers if referenced, not just for call expressions (#575)
Fix parsing of <textarea> children (#599)
Treat <textarea> value attributes and children as equivalent, and fail validation if both are present (#599)
Fix <textarea> SSR (#599)
Apply CSS transition styles immediately if transition has delay (#574)
Ensure transitionManager is treeshakeable (#593)
Fix for environments where node.style.animation is undefined (#587)
Fix order of operations when dealing with <select> elements (#590)
Downgrade 'invalid callee' to a warning (#579)
Convert to TypeScript (#573)

1.20.2

Fix destruction of compound if-blocks with outros (#572)

1.20.1

Fix insertion order of if blocks and their anchors (#569)

1.20.0

Faster, better updates of keyed each blocks (#373, #543)
Use element IDs to robustly track dynamically injected <style> tags (#554)
Abort outros before corresponding intros (#546)
Generate less code for if blocks with else blocks (#540)
Ensure {{yield}} block content is injected into the right place (#561)
Simpler, more readable codegen code (#559)
Validate transition directives (#564)
Apply delays to bidirectional transitions (#562)
Handle all valid HTML entities (#565)
Fix outros on compound if blocks (#565)
Validation for <:Window> tags (#565)
Increased test coverage (#565)

1.19.1

Export generateKeyframes, so that CSS transitions work

1.19.0

Experimental support for transitions (#7)
Use querySelector(':checked') instead of selectedOptions (#539)
Stringify helpers before bundling them, to avoid renaming errors (#538)

1.18.2

Parenthesize if-block conditions (#532)
Fix parsing of parenthesized expressions (#534)
Fix error on bind:checked that doesn't belong to a checkbox input (#529)

1.18.1

Allow destroy() in event handlers (#523)
Fix bug with {{yield}} blocks following elements (#524)

1.18.0

Visit <select> attributes after children, to ensure options are in the right state (#521)
Use sibling elements as anchors rather than creating comment nodes wherever possible (#3)

1.17.2

Replace bad characters when creating variable names based on element names (#516)

1.17.1

Fixes for static each-else and yield blocks (#509), (#514)
Code generation tweaks (#504), (#507)

1.17.0

Add currentTime, duration and paused bindings for media elements (#406)
Don't treat helpers as dependencies (#492)
Allow <:Window> event handlers to access component state (#497)
Allow two-way binding to properties named 'component' (#495)
Group checkbox bindings correctly, to avoid erroneously unchecking siblings (#498)
Validate two-way bindings (#494)
Allow dynamic each-block to have static else-block (#501)
Initialise <select> value correctly (#502)

1.16.0

Better code generation (#489), (#490), (#491)
Prevent binding blowback on initial render (#488)

1.15.1

Clone data before merging it with state (#479)
Apply binding event handlers before user event handlers (#486)

1.15.0

Dev mode — downgrade 'missing data' to a warning, and ignore whitelisted globals (#475)
Fix <select> value binding when options are updated late (#476)
Throw at compile time if event handler references invalid callee (#473)
Check for helper function purity (#473)
Validate namespace option (#473)

1.14.1

Replace bad characters when creating variable names based on attributes (#470)

1.14.0

Better guard against naming conflicts (#465)
Better error if getters and setters are used with methods (#425)
Don't create whitespace nodes inside elements that can't use them (#189)
Collapse consecutive if statements with the same condition (#450)
Window scroll bindings are bidirectional (#404)
Add bind:online to window (#404)
In dev mode, throw if read-only properties are set (#404)
Prevent conflicts with component name (#464)
Ensure event handler names are deconflicted (#466)

1.13.7

Fix observers — defer: true now triggers callback after DOM is updated (#441)
Handle empty computed property (#452)
Correctly bind one-way <select> value attributes with objects (#423)
Hoist event handlers inside each blocks, where possible (#456)
Don't bind event handler callbacks (#433)
Internal refactoring and neater code generation (#453)

1.13.6

Use assign helper instead of Object.assign for better performance and legacy compatibility (#431)
Improved code generation (#419), (#440), (#442)

1.13.5

Read range and number input values as numbers (#436)
Better error for bind:value='{{foo}}' (#437)

1.13.4

Prevent unclosed <script> tag causing infinite loop (#435)

1.13.3

Correctly handle {{true}}, {{false}} and {{null}} (#424)
Update <select> value attributes correctly (#423)
Bind custom event handler callbacks (#428)
Disallow import root (#430)
Prevent component bindings mutating the wrong object (#432)

1.13.2

Fix deep component bindings (#420)
Include css property in compiler output (#409)
Treat functions as mutable objects when recomputing (#413
Include magic-string in bundle (#410)
Disable unneeded Bublé transformations for slimmer output (#411)

1.13.1

Prevent infinite loops with pathological component bindings (#398)
More robust deconflicting (#401)

1.13.0

Add <:Window> meta tag with event listeners, and a handful of bindings (#371)
Don't uncheck radios incorrectly (#399)

1.12.1

Deconflict non-helper functions (addCss etc) (#388)
Allow reserved words in tags, e.g. {{class}} (#383)

1.12.0

Shorthand attributes — <Widget :foo/> is equivalent to <Widget foo='{{foo}}'/> (#384)
Support bind:group for radio and checkbox inputs (#311, #312)
Better sourcemap support for two-way bindings

1.11.4

Dev mode warning for bad component.observe arguments (#369)
Translate component.on('teardown', ...) to component.on('destroy', ...) and add dev warning (#365)
Use shared prototype to save bytes (#378)

1.11.3

Undo CSS behaviour change in 1.11.2 (#372)
Pin version of css-tree (#370)

1.11.2

Add component CSS to each document a component is rendered to (#331)

1.11.1

Fix two-way binding for components inside each blocks (#356)

1.11.0

Add format: 'eval' and svelte.create, to create components directly from source code (#345)
Node 4 compatibility (#109)

1.10.3

Prevent '</script>' string occurrence breaking pages (#349)
Allow reference to whitelisted globals without properties (#333)
Don't remove   incorrectly (#348)
let -> var in addCss block (#351)

1.10.2

Accept any case for doctype declarations (#336)
Allow non-top-level <script> and <style> tags to pass through without processing (#335)

1.10.1

typecheck argument in _set when in dev mode (#342)
Prevent duplicate helpers in non-shared mode (#337)

1.10.0

Component self-references with <:Self/> (#51)
Two-way binding with <select multiple> (#313)

1.9.1

Better error for malformed event handlers (#220)
Allow function expressions in tags (#269)

1.9.0

Add development warnings (#13), (#320), (#177), (#249)
Better error if parser encounters an unmatched closing tag (#321)

1.8.1

Allow implicitly closed elements (#318)
More informative error messages for unclosed elements/blocks (#258)
Deprecate onrender and onteardown in favour of oncreate and ondestroy (#40)

1.8.0

Prevent duplicate imports (#308)
Use input events (not change) for all input elements other than checkbox and radio, and textareas (#309)
Encapsulate keyframe declarations (#245)

1.7.1

Deconflict imports and shared helpers (#222)
Deconflict each-block contexts and reserved words (#222)
Allow shorthand properties in expressions (#296)

1.7.0

Include CSS AST in svelte.parse output (#302)
Better handling of CSS parse errors (#302)
Initialise <select> elements with two-way binding correctly (#301)
Allow local context in component event handlers inside each blocks (#290)
Fix two-way binding for components inside each blocks (#290)

1.6.11

Initialise dynamic <option> value correctly (#291)

1.6.10

Ensure sources and sourcesContent are populated in sourcemaps, even if none of the original code is used (#295)
Add outputFilename option to populate file and sources sourcemap properties correctly (#295)

1.6.9

Don't trigger bindings for torn-down components (#277)
SSR: Handle two-way bindings (#275)
Improve performance by checking data has changed before updates (#279)
Parse CSS with css-tree to prevent transformation errors with unconventional styles (#288)

1.6.8

Always trigger onrender, including when change initiator is a nested component (#263)
Handle default function parameters in computations (#274)

1.6.7

SSR: Fix apostrophes (#267)
Add xmlns attributes to SVGs (#262)

1.6.6

Omit text from comment anchors (#247)
Handle xlink attributes (#264)

1.6.5

Handle <!doctype> declarations (#255)

1.6.4

Fix updates of yields inside each blocks (20e1b05)
SSR: Handle attributes with values that begin with a number (#248)
Handle multiline comments in CSS (#252)

1.6.3

Fix {{yield}} bugs for components inside if and each blocks (#230, #231)
Set attributes on <svg> elements correctly (#233)
Add svelte.VERSION property to compiler

1.6.2

Use helpers for addEventListener, removeEventListener, setAttribute (#227)
Escape sharedPath (#229)
Handle attributes with values that begin with a number (#234)
Update dependencies

1.6.1

SSR: Handle component directives at arbitrary positions (#221)
Provide useful feedback on invalid void closing tag (#224)

1.6.0

Replace standalone: false with shared: true, or shared: 'custom/path/to/shared.js' (#218)
Include shared.js in package

1.5.0

Implement standalone: false (#9)
SSR: Handle component directives (216)

1.4.0

Keyed each blocks (#81)

1.3.1

Remove file extensions from AMD dependencies (#144)
Throw if options.name is illegal (#102)

1.3.0

SSR compiler: Support format option (#196)
SSR compiler: Don't self-close 'normal' elements (#200)
Remove leading spaces from scoped CSS (#140)
Internal refactoring

1.2.5

Allow whitelisted globals in templates (#185)
Intercept parse errors with options.onerror

1.2.4

SSR compiler: Implement {{{triples}}} (#197)
SSR compiler: Escape HTML in tags (#197)

1.2.3

Add support for namespace declaration for SVG (etc) components (#147)
Throw error if methods or lifecycle hooks are arrow functions that use this or arguments (#179)
Use setAttribute() for list attributes, to preserve link to <datalist> (#178)
Throw error if default export is not an object literal (#190)
Internal refactoring

1.2.2

Omit directives in server-side rendering (#163)
Handle comments in SSR (#165)
Support calling methods of event/this in event handlers (#162)
Remove mount from public API (#150)

1.2.1

Server-side rendering is available as a compiler option (generate: 'ssr') (#159)
Allow call expressions where function is not in helpers (#163)

1.2.0

Server-side rendering of HTML (#148) and CSS (#154)

1.1.3

Handle xmlns attributes correctly (#142)
Error on duplicate <style>/<script> tags rather than failing silently (#142)
Don't create whitespace text nodes inside SVG elements (#142)
Require void elements to be lowercase, to eliminate confusion with components (#137)

1.1.2

Deconflict variable names (#88, #126)

1.1.1

Support multiple SVG elements in a component (#130)

1.1.0

Separate fragment creation from mount (#91)
Trigger onrender hook at correct time for nested components (#103)
Fix keypath dynamic attributes in components (#46)
Implement {{yield}} (#112)
Optimise teardown (#99)
Require computed properties to have at least one dependency (#115)
Support {{#each ...}}...{{else}}...{{/each}} (#90)
Triple mustaches (#35)

1.0.7

Correctly escape HTML entities (#85)

1.0.6

Generate useful sourcemaps (#60)

1.0.5

Ensure compiler only generates ES5 code (#75)
get() without arguments returns entire state object (#73)

1.0.4

Handle empty attributes in elements and components (#63)
Detach top-level text nodes inside departing each blocks (#62)

1.0.3

Better generated code for if blocks, especially with else/elseif chains (#28)
Trim unnecessary whitespace from else/elseif blocks (#49)
Handle trailing comments in script tags (#64)

1.0.2

Set style.cssText rather than style (#44)

1.0.1

Preserve SVG namespace inside each blocks
Always use setAttribute with SVG elements

1.0.0

Generate AMD, CJS, IIFE and UMD builds
Correctly insert text nodes before anchors (#31)

0.3.0

Fix bug where departing element would unset ref incorrectly (#24)
Basic template validation (#6)
Fire onrender hooks once component is in DOM (#18)
Only detach nodes when necessary to do so (#26)

0.2.2

On second thoughts, don't transpile build. Was only really for Uglify's benefit, which is daft

0.2.1

Transpile build

0.2.0

Only generate UMD build, for now
Include dependencies in the build, treat as devDependencies
Faster initial render
Parent data overrides child defaults
Remove top-level text nodes on teardown
Handle readUntil errors in parser
Basic <select> binding
Handle missing data
Prevent infinite set/observe loops
Add bind:foo shorthand
else and elseif blocks
Hoist imports

0.1.1

Support unquoted attributes
Handle entities in attributes
Inline nested components
fire and on methods

0.1.0

Breaking change – Svelte compiler now generates constructor functions rather than factories (#2)
SVG support

0.0.2

First release capable of building TodoMVC

0.0.1

Just squatting on the package name

Files

CHANGELOG.md

Latest commit

History

CHANGELOG.md

File metadata and controls

Svelte changelog

3.46.6

3.46.5

3.46.4

3.46.3

3.46.2

3.46.1

3.46.0

3.45.0

3.44.3

3.44.2

3.44.1

3.44.0

3.43.2

3.43.1

3.43.0

3.42.6

3.42.5

3.42.4

3.42.3

3.42.2

3.42.1

3.42.0

3.41.0

3.40.3

3.40.2

3.40.1

3.40.0

3.39.0

3.38.3

3.38.2

3.38.1

3.38.0

3.37.0

3.36.0

3.35.0

3.34.0

3.33.0

3.32.3

3.32.2

3.32.1

3.32.0

3.31.2

3.31.1

3.31.0

3.30.1

3.30.0

3.29.7

3.29.6

3.29.5

3.29.4

3.29.3

3.29.2

3.29.1

3.29.0

3.28.0

3.27.0

3.26.0

3.25.1

3.25.0

3.24.1

3.24.0

3.23.2

3.23.1

3.23.0

3.22.3

3.22.2

3.22.1

3.22.0

3.21.0

3.20.1

3.20.0

3.19.2

3.19.1