# Svelte changelog
## 1.20.0
* Faster, better updates of keyed each blocks ([#373](https://github.com/sveltejs/svelte/issues/373), [#543 ](https://github.com/sveltejs/svelte/issues/543 ))
* Use element IDs to robustly track dynamically injected `<style>` tags ([#554](https://github.com/sveltejs/svelte/issues/554))
* Abort outros before corresponding intros ([#546](https://github.com/sveltejs/svelte/issues/546))
* Generate less code for `if` blocks with `else` blocks ([#540](https://github.com/sveltejs/svelte/issues/540))
* Ensure `{{yield}}` block content is injected into the right place ([#561](https://github.com/sveltejs/svelte/issues/561))
* Simpler, more readable codegen code ([#559](https://github.com/sveltejs/svelte/pull/559))
* Validate transition directives ([#564](https://github.com/sveltejs/svelte/issues/564))
* Apply delays to bidirectional transitions ([#562](https://github.com/sveltejs/svelte/issues/562))
* Handle all valid HTML entities ([#565](https://github.com/sveltejs/svelte/pull/565))
* Fix outros on compound `if` blocks ([#565](https://github.com/sveltejs/svelte/pull/565))
* Validation for `<:Window>` tags ([#565](https://github.com/sveltejs/svelte/pull/565))
* Increased test coverage ([#565](https://github.com/sveltejs/svelte/pull/565))
## 1.19.1
* Export `generateKeyframes` , so that CSS transitions work
## 1.19.0
* Experimental support for transitions ([#7](https://github.com/sveltejs/svelte/issues/7))
* Use `querySelector(':checked')` instead of `selectedOptions` ([#539](https://github.com/sveltejs/svelte/issues/539))
* Stringify helpers before bundling them, to avoid renaming errors ([#538](https://github.com/sveltejs/svelte/issues/538))
## 1.18.2
* Parenthesize if-block conditions ([#532](https://github.com/sveltejs/svelte/issues/532))
* Fix parsing of parenthesized expressions ([#534](https://github.com/sveltejs/svelte/issues/534))
* Fix error on `bind:checked` that doesn't belong to a checkbox input ([#529](https://github.com/sveltejs/svelte/pull/529))
## 1.18.1
* Allow `destroy()` in event handlers ([#523](https://github.com/sveltejs/svelte/issues/523))
* Fix bug with `{{yield}}` blocks following elements ([#524](https://github.com/sveltejs/svelte/issues/524))
## 1.18.0
* Visit `<select>` attributes after children, to ensure options are in the right state ([#521](https://github.com/sveltejs/svelte/pull/521))
* Use sibling elements as anchors rather than creating comment nodes wherever possible ([#3](https://github.com/sveltejs/svelte/issues/3))
## 1.17.2
* Replace bad characters when creating variable names based on element names ([#516](https://github.com/sveltejs/svelte/issues/516))
## 1.17.1
* Fixes for static each-else and yield blocks ([#509](https://github.com/sveltejs/svelte/issues/509)), ([#514](https://github.com/sveltejs/svelte/issues/514))
* Code generation tweaks ([#504](https://github.com/sveltejs/svelte/issues/504)), ([#507](https://github.com/sveltejs/svelte/issues/507))
## 1.17.0
* Add `currentTime` , `duration` and `paused` bindings for media elements ([#406](https://github.com/sveltejs/svelte/issues/406))
* Don't treat helpers as dependencies ([#492](https://github.com/sveltejs/svelte/issues/492))
* Allow `<:Window>` event handlers to access component state ([#497](https://github.com/sveltejs/svelte/pull/497))
* Allow two-way binding to properties named 'component' ([#495](https://github.com/sveltejs/svelte/issues/495))
* Group checkbox bindings correctly, to avoid erroneously unchecking siblings ([#498](https://github.com/sveltejs/svelte/issues/498))
* Validate two-way bindings ([#494](https://github.com/sveltejs/svelte/pull/494))
* Allow dynamic each-block to have static else-block ([#501](https://github.com/sveltejs/svelte/pull/501))
* Initialise `<select>` value correctly ([#502](https://github.com/sveltejs/svelte/pull/502))
## 1.16.0
* Better code generation ([#489](https://github.com/sveltejs/svelte/pull/489)), ([#490](https://github.com/sveltejs/svelte/pull/490)), ([#491](https://github.com/sveltejs/svelte/pull/491))
* Prevent binding blowback on initial render ([#488](https://github.com/sveltejs/svelte/pull/488))
## 1.15.1
* Clone data before merging it with state ([#479](https://github.com/sveltejs/svelte/issues/479))
* Apply binding event handlers before user event handlers ([#486](https://github.com/sveltejs/svelte/issues/486))
## 1.15.0
* Dev mode — downgrade 'missing data' to a warning, and ignore whitelisted globals ([#475](https://github.com/sveltejs/svelte/issues/475))
* Fix `<select>` value binding when options are updated late ([#476](https://github.com/sveltejs/svelte/issues/476))
* Throw at compile time if event handler references invalid callee ([#473](https://github.com/sveltejs/svelte/pull/473))
* Check for helper function purity ([#473](https://github.com/sveltejs/svelte/pull/473))
* Validate `namespace` option ([#473](https://github.com/sveltejs/svelte/pull/473))
## 1.14.1
* Replace bad characters when creating variable names based on attributes ([#470](https://github.com/sveltejs/svelte/issues/470))
## 1.14.0
* Better guard against naming conflicts ([#465](https://github.com/sveltejs/svelte/issues/465))
* Better error if getters and setters are used with `methods` ([#425](https://github.com/sveltejs/svelte/issues/425))
* Don't create whitespace nodes inside elements that can't use them ([#189](https://github.com/sveltejs/svelte/issues/189))
* Collapse consecutive `if` statements with the same condition ([#450](https://github.com/sveltejs/svelte/issues/450))
* Window `scroll` bindings are bidirectional ([#404](https://github.com/sveltejs/svelte/issues/404))
* Add `bind:online` to window ([#404](https://github.com/sveltejs/svelte/issues/404))
* In dev mode, throw if read-only properties are set ([#404](https://github.com/sveltejs/svelte/issues/404))
* Prevent conflicts with component name ([#464](https://github.com/sveltejs/svelte/pull/464))
* Ensure event handler names are deconflicted ([#466](https://github.com/sveltejs/svelte/issues/466))
## 1.13.7
* Fix observers — `defer: true` now triggers callback after DOM is updated ([#441](https://github.com/sveltejs/svelte/issues/441))
* Handle empty `computed` property ([#452](https://github.com/sveltejs/svelte/issues/452))
* Correctly bind one-way `<select>` value attributes with objects ([#423](https://github.com/sveltejs/svelte/issues/423))
* Hoist event handlers inside each blocks, where possible ([#456](https://github.com/sveltejs/svelte/pull/456))
* Don't bind event handler callbacks ([#433](https://github.com/sveltejs/svelte/issues/433))
* Internal refactoring and neater code generation ([#453](https://github.com/sveltejs/svelte/pull/453))
## 1.13.6
* Use `assign` helper instead of `Object.assign` for better performance and legacy compatibility ([#431](https://github.com/sveltejs/svelte/issues/431))
* Improved code generation ([#419](https://github.com/sveltejs/svelte/issues/419)), ([#440](https://github.com/sveltejs/svelte/issues/440)), ([#442](https://github.com/sveltejs/svelte/issues/442))
## 1.13.5
* Read `range` and `number` input values as numbers ([#436](https://github.com/sveltejs/svelte/issues/436))
* Better error for `bind:value='{{foo}}'` ([#437](https://github.com/sveltejs/svelte/issues/437))
## 1.13.4
* Prevent unclosed `<script>` tag causing infinite loop ([#435](https://github.com/sveltejs/svelte/pull/435))
## 1.13.3
* Correctly handle `{{true}}` , `{{false}}` and `{{null}}` ([#424](https://github.com/sveltejs/svelte/issues/424))
* Update `<select>` value attributes correctly ([#423](https://github.com/sveltejs/svelte/issues/423))
* Bind custom event handler callbacks ([#428](https://github.com/sveltejs/svelte/issues/428))
* Disallow `import root` ([#430](https://github.com/sveltejs/svelte/pull/430))
* Prevent component bindings mutating the wrong object ([#432](https://github.com/sveltejs/svelte/pull/432))
## 1.13.2
* Fix deep component bindings ([#420](https://github.com/sveltejs/svelte/issues/420))
* Include `css` property in compiler output ([#409](https://github.com/sveltejs/svelte/issues/409))
* Treat functions as mutable objects when recomputing ([#413](https://github.com/sveltejs/svelte/issues/413)
* Include magic-string in bundle ([#410](https://github.com/sveltejs/svelte/issues/410))
* Disable unneeded Bublé transformations for slimmer output ([#411](https://github.com/sveltejs/svelte/pull/411))
## 1.13.1
* Prevent infinite loops with pathological component bindings ([#398](https://github.com/sveltejs/svelte/issues/398))
* More robust deconflicting ([#401](https://github.com/sveltejs/svelte/pull/401))
## 1.13.0
* Add `<:Window>` meta tag with event listeners, and a handful of bindings ([#371](https://github.com/sveltejs/svelte/issues/371))
* Don't uncheck radios incorrectly ([#399](https://github.com/sveltejs/svelte/issues/399))
## 1.12.1
* Deconflict non-helper functions (`addCss` etc) ([#388](https://github.com/sveltejs/svelte/issues/388))
* Allow reserved words in tags, e.g. `{{class}}` ([#383](https://github.com/sveltejs/svelte/issues/383))
## 1.12.0
* Shorthand attributes — `<Widget :foo/>` is equivalent to `<Widget foo='{{foo}}'/>` ([#384](https://github.com/sveltejs/svelte/pull/384))
* Support `bind:group` for radio and checkbox inputs ([#311](https://github.com/sveltejs/svelte/issues/311), [#312 ](https://github.com/sveltejs/svelte/issues/312 ))
* Better sourcemap support for two-way bindings
## 1.11.4
* Dev mode warning for bad `component.observe` arguments ([#369](https://github.com/sveltejs/svelte/issues/369))
* Translate `component.on('teardown', ...)` to `component.on('destroy', ...)` and add dev warning ([#365](https://github.com/sveltejs/svelte/issues/365))
* Use shared prototype to save bytes ([#378](https://github.com/sveltejs/svelte/pull/378))
## 1.11.3
* Undo CSS behaviour change in 1.11.2 ([#372](https://github.com/sveltejs/svelte/issues/372))
* Pin version of css-tree ([#370](https://github.com/sveltejs/svelte/pull/370))
## 1.11.2
* Add component CSS to each document a component is rendered to ([#331](https://github.com/sveltejs/svelte/issues/331))
## 1.11.1
* Fix two-way binding for components inside `each` blocks ([#356](https://github.com/sveltejs/svelte/issues/356))
## 1.11.0
* Add `format: 'eval'` and `svelte.create` , to create components directly from source code ([#345](https://github.com/sveltejs/svelte/issues/345))
* Node 4 compatibility ([#109](https://github.com/sveltejs/svelte/issues/109))
## 1.10.3
* Prevent `'</script>'` string occurence breaking pages ([#349](https://github.com/sveltejs/svelte/pull/349))
* Allow reference to whitelisted globals without properties ([#333](https://github.com/sveltejs/svelte/pull/333))
* Don't remove ` ` incorrectly ([#348](https://github.com/sveltejs/svelte/issues/348))
* `let` -> `var` in `addCss` block ([#351](https://github.com/sveltejs/svelte/pull/351))
## 1.10.2
* Accept any case for doctype declarations ([#336](https://github.com/sveltejs/svelte/issues/336))
* Allow non-top-level `<script>` and `<style>` tags to pass through without processing ([#335](https://github.com/sveltejs/svelte/issues/335))
## 1.10.1
* typecheck argument in _set when in dev mode ([#342](https://github.com/sveltejs/svelte/issues/342))
* Prevent duplicate helpers in non-shared mode ([#337](https://github.com/sveltejs/svelte/issues/337))
## 1.10.0
* Component self-references with `<:Self/>` ([#51](https://github.com/sveltejs/svelte/issues/51))
* Two-way binding with `<select multiple>` ([#313](https://github.com/sveltejs/svelte/issues/313))
## 1.9.1
* Better error for malformed event handlers ([#220](https://github.com/sveltejs/svelte/issues/220))
* Allow function expressions in tags ([#269](https://github.com/sveltejs/svelte/issues/269))
## 1.9.0
* Add development warnings ([#13](https://github.com/sveltejs/svelte/issues/13)), ([#320](https://github.com/sveltejs/svelte/pull/320)), ([#177](https://github.com/sveltejs/svelte/issues/177)), ([#249](https://github.com/sveltejs/svelte/issues/249))
* Better error if parser encounters an unmatched closing tag ([#321](https://github.com/sveltejs/svelte/issues/321))
## 1.8.1
* Allow implicitly closed elements ([#318](https://github.com/sveltejs/svelte/pull/318))
* More informative error messages for unclosed elements/blocks ([#258](https://github.com/sveltejs/svelte/issues/258))
* Deprecate `onrender` and `onteardown` in favour of `oncreate` and `ondestroy` ([#40](https://github.com/sveltejs/svelte/issues/40))
## 1.8.0
* Prevent duplicate imports ([#308](https://github.com/sveltejs/svelte/issues/308))
* Use `input` events (not `change` ) for all input elements other than `checkbox` and `radio` , and textareas ([#309](https://github.com/sveltejs/svelte/pull/309))
* Encapsulate keyframe declarations ([#245](https://github.com/sveltejs/svelte/issues/245))
## 1.7.1
* Deconflict imports and shared helpers ([#222](https://github.com/sveltejs/svelte/issues/222))
* Deconflict each-block contexts and reserved words ([#222](https://github.com/sveltejs/svelte/issues/222))
* Allow shorthand properties in expressions ([#296](https://github.com/sveltejs/svelte/issues/296))
## 1.7.0
* Include CSS AST in `svelte.parse` output ([#302](https://github.com/sveltejs/svelte/pull/302))
* Better handling of CSS parse errors ([#302](https://github.com/sveltejs/svelte/pull/302))
* Initialise `<select>` elements with two-way binding correctly ([#301](https://github.com/sveltejs/svelte/issues/301))
* Allow local context in component event handlers inside `each` blocks ([#290](https://github.com/sveltejs/svelte/issues/290))
* Fix two-way binding for components inside `each` blocks ([#290](https://github.com/sveltejs/svelte/issues/290))
## 1.6.11
* Initialise dynamic `<option>` value correctly ([#291](https://github.com/sveltejs/svelte/issues/291))
## 1.6.10
* Ensure `sources` and `sourcesContent` are populated in sourcemaps, even if none of the original code is used ([#295](https://github.com/sveltejs/svelte/pull/295))
* Add `outputFilename` option to populate `file` and `sources` sourcemap properties correctly ([#295](https://github.com/sveltejs/svelte/pull/295))
## 1.6.9
* Don't trigger bindings for torn-down components ([#277](https://github.com/sveltejs/svelte/issues/277))
* SSR: Handle two-way bindings ([#275](https://github.com/sveltejs/svelte/issues/275))
* Improve performance by checking data has changed before updates ([#279](https://github.com/sveltejs/svelte/pull/279))
* Parse CSS with css-tree to prevent transformation errors with unconventional styles ([#288](https://github.com/sveltejs/svelte/issues/288))
## 1.6.8
* Always trigger `onrender` , including when change initiator is a nested component ([#263](https://github.com/sveltejs/svelte/issues/263))
* Handle default function parameters in computations ([#274](https://github.com/sveltejs/svelte/issues/274))
## 1.6.7
* SSR: Fix apostrophes ([#267](https://github.com/sveltejs/svelte/issues/267))
* Add `xmlns` attributes to SVGs ([#262](https://github.com/sveltejs/svelte/pull/262))
## 1.6.6
* Omit text from comment anchors ([#247](https://github.com/sveltejs/svelte/issues/247))
* Handle `xlink` attributes ([#264](https://github.com/sveltejs/svelte/issues/264))
## 1.6.5
* Handle `<!doctype>` declarations ([#255](https://github.com/sveltejs/svelte/pull/255))
## 1.6.4
* Fix updates of yields inside each blocks ([20e1b05](https://github.com/sveltejs/svelte/commit/20e1b05c45dc9fcddfe2e7c5c9fc3109f0d45fa9))
* SSR: Handle attributes with values that begin with a number ([#248](https://github.com/sveltejs/svelte/issues/248))
* Handle multiline comments in CSS ([#252](https://github.com/sveltejs/svelte/issues/252))
## 1.6.3
* Fix `{{yield}}` bugs for components inside `if` and `each` blocks ([#230](https://github.com/sveltejs/svelte/issues/230), [#231 ](https://github.com/sveltejs/svelte/issues/231 ))
* Set attributes on `<svg>` elements correctly ([#233](https://github.com/sveltejs/svelte/issues/233))
* Add `svelte.VERSION` property to compiler
## 1.6.2
* Use helpers for `addEventListener` , `removeEventListener` , `setAttribute` ([#227](https://github.com/sveltejs/svelte/pull/227))
* Escape `sharedPath` ([#229](https://github.com/sveltejs/svelte/pull/229))
* Handle attributes with values that begin with a number ([#234](https://github.com/sveltejs/svelte/issues/234))
* Update dependencies
## 1.6.1
* SSR: Handle component directives at arbitrary positions ([#221](https://github.com/sveltejs/svelte/issues/221))
* Provide useful feedback on invalid void closing tag ([#224](https://github.com/sveltejs/svelte/issues/224))
## 1.6.0
* Replace `standalone: false` with `shared: true` , or `shared: 'custom/path/to/shared.js'` ([#218](https://github.com/sveltejs/svelte/issues/218))
* Include `shared.js` in package
## 1.5.0
* Implement `standalone: false` ([#9](https://github.com/sveltejs/svelte/issues/9))
* SSR: Handle component directives ([216](https://github.com/sveltejs/svelte/issues/216))
## 1.4.0
* Keyed `each` blocks ([#81](https://github.com/sveltejs/svelte/issues/81))
## 1.3.1
* Remove file extensions from AMD dependencies ([#144](https://github.com/sveltejs/svelte/issues/144))
* Throw if `options.name` is illegal ([#102](https://github.com/sveltejs/svelte/issues/102))
## 1.3.0
* SSR compiler: Support `format` option ([#196](https://github.com/sveltejs/svelte/issues/196))
* SSR compiler: Don't self-close 'normal' elements ([#200](https://github.com/sveltejs/svelte/issues/200))
* Remove leading spaces from scoped CSS ([#140](https://github.com/sveltejs/svelte/issues/140))
* Internal refactoring
## 1.2.5
* Allow whitelisted globals in templates ([#185](https://github.com/sveltejs/svelte/issues/185))
* Intercept parse errors with `options.onerror`
## 1.2.4
* SSR compiler: Implement `{{{triples}}}` ([#197](https://github.com/sveltejs/svelte/issues/197))
* SSR compiler: Escape HTML in tags ([#197](https://github.com/sveltejs/svelte/issues/197))
## 1.2.3
* Add support for `namespace` declaration for SVG (etc) components ([#147](https://github.com/sveltejs/svelte/issues/147))
* Throw error if methods or lifecycle hooks are arrow functions that use `this` or `arguments` ([#179](https://github.com/sveltejs/svelte/issues/179))
* Use `setAttribute()` for `list` attributes, to preserve link to `<datalist>` ([#178](https://github.com/sveltejs/svelte/issues/178))
* Throw error if default export is not an object literal ([#190](https://github.com/sveltejs/svelte/pull/190))
* Internal refactoring
## 1.2.2
* Omit directives in server-side rendering ([#163](https://github.com/sveltejs/svelte/issues/167))
* Handle comments in SSR ([#165](https://github.com/sveltejs/svelte/issues/165))
* Support calling methods of `event` /`this` in event handlers ([#162](https://github.com/sveltejs/svelte/issues/162))
* Remove `mount` from public API ([#150](https://github.com/sveltejs/svelte/issues/150))
## 1.2.1
* Server-side rendering is available as a compiler option (`generate: 'ssr'`) ([#159](https://github.com/sveltejs/svelte/pull/159))
* Allow call expressions where function is not in `helpers` ([#163](https://github.com/sveltejs/svelte/issues/163))
## 1.2.0
* Server-side rendering of HTML ([#148](https://github.com/sveltejs/svelte/pull/148)) and CSS ([#154](https://github.com/sveltejs/svelte/pull/154))
## 1.1.3
* Handle `xmlns` attributes correctly ([#142](https://github.com/sveltejs/svelte/issues/142))
* Error on duplicate `<style>` /`< script > ` tags rather than failing silently ([#142](https://github.com/sveltejs/svelte/issues/142))
* Don't create whitespace text nodes inside SVG elements ([#142](https://github.com/sveltejs/svelte/issues/142))
* Require void elements to be lowercase, to eliminate confusion with components ([#137](https://github.com/sveltejs/svelte/issues/137))
## 1.1.2
* Deconflict variable names ([#88](https://github.com/sveltejs/svelte/issues/88), [#126 ](https://github.com/sveltejs/svelte/issues/126 ))
## 1.1.1
* Support multiple SVG elements in a component ([#130](https://github.com/sveltejs/svelte/issues/130))
## 1.1.0
* Separate fragment creation from `mount` ([#91](https://github.com/sveltejs/svelte/pull/91))
* Trigger `onrender` hook at correct time for nested components ([#103](https://github.com/sveltejs/svelte/pull/103))
* Fix keypath dynamic attributes in components ([#46](https://github.com/sveltejs/svelte/issues/46))
* Implement `{{yield}}` ([#112](https://github.com/sveltejs/svelte/pull/112))
* Optimise teardown ([#99](https://github.com/sveltejs/svelte/issues/99))
* Require computed properties to have at least one dependency ([#115](https://github.com/sveltejs/svelte/pull/115))
* Support `{{#each ...}}...{{else}}...{{/each}}` ([#90](https://github.com/sveltejs/svelte/issues/90))
* Triple mustaches ([#35](https://github.com/sveltejs/svelte/issues/35))
## 1.0.7
* Correctly escape HTML entities ([#85](https://github.com/sveltejs/svelte/issues/85))
## 1.0.6
* Generate useful sourcemaps ([#60](https://github.com/sveltejs/svelte/issues/60))
## 1.0.5
* Ensure compiler only generates ES5 code ([#75](https://github.com/sveltejs/svelte/issues/75))
* `get()` without arguments returns entire state object ([#73](https://github.com/sveltejs/svelte/issues/73))
## 1.0.4
* Handle empty attributes in elements and components ([#63](https://github.com/sveltejs/svelte/issues/63))
* Detach top-level text nodes inside departing each blocks ([#62](https://github.com/sveltejs/svelte/issues/62))
## 1.0.3
* Better generated code for `if` blocks, especially with `else` /`elseif` chains ([#28](https://github.com/sveltejs/svelte/pull/28))
* Trim unnecessary whitespace from `else` /`elseif` blocks ([#49](https://github.com/sveltejs/svelte/pull/49))
* Handle trailing comments in script tags ([#64](https://github.com/sveltejs/svelte/issues/64))
## 1.0.2
Set `style.cssText` rather than `style` ([#44](https://github.com/sveltejs/svelte/issues/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](https://github.com/sveltejs/svelte/pull/31))
## 0.3.0
* Fix bug where departing element would unset `ref` incorrectly ([#24](https://github.com/sveltejs/svelte/issues/24))
* Basic template validation ([#6](https://github.com/sveltejs/svelte/issues/6))
* Fire `onrender` hooks once component is in DOM ([#18](https://github.com/sveltejs/svelte/issues/18))
* Only detach nodes when necessary to do so ([#26](https://github.com/sveltejs/svelte/issues/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](https://github.com/sveltejs/svelte/issues/2))
* SVG support
## 0.0.2
* First release capable of building TodoMVC
## 0.0.1
* Just squatting on the package name