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@microsoft/fast-element

Microsoft480.5kMIT2.4.1

A library for constructing Web Components

readme

FAST Element

The fast-element library is a lightweight means to easily build performant, memory-efficient, standards-compliant Web Components. FAST Elements work in every major browser and can be used in combination with any front-end framework or even without a framework.

Installation

From NPM

To install the latest fast-element library using npm:

npm install --save @microsoft/fast-element

Within your JavaScript or TypeScript code, you can then import library APIs like this:

import { FASTElement } from '@microsoft/fast-element';

From CDN

A pre-bundled script that contains all APIs needed to build web components with FAST Element is available on CDN. You can use this script by adding type="module" to the script element and then importing from the CDN.

<!DOCTYPE html>
<html lang="en">
    <head>
        <script type="module">
          import { FASTElement } from "https://cdn.jsdelivr.net/npm/@microsoft/fast-element/dist/fast-element.min.js";

          // your code here
        </script>
    </head>
    <!-- ... -->
</html>

The markup above always references the latest release. When deploying to production, you will want to ship with a specific version. Here's an example of the markup for that:

<script type="module" src="https://cdn.jsdelivr.net/npm/@microsoft/fast-element@1.6.2/dist/fast-element.min.js"></script>

:::note For simplicity, examples throughout the documentation will assume the library has been installed from NPM, but you can always replace the import location with the CDN URL. :::

:::tip Looking for a quick guide on building components? Check out our Cheat Sheet. :::

更新履歴

Change Log - @microsoft/fast-element

2.4.1

Fri, 30 May 2025 05:01:32 GMT

Patches

Update logic for enumerated attribute hydration markers, add view hydration as export (7559015+janechu@users.noreply.github.com)

2.4.0

Fri, 23 May 2025 23:52:29 GMT

Minor changes

Add enumerated hydration binding markers (7559015+janechu@users.noreply.github.com)

2.3.0

Mon, 05 May 2025 00:33:41 GMT

Minor changes

Allow shadowOptions to be observed (7559015+janechu@users.noreply.github.com)

2.2.1

Wed, 16 Apr 2025 15:53:12 GMT

Patches

fix: use Observable method instead of decorator in FASTElementDefinition class (863023+radium-v@users.noreply.github.com)

2.2.0

Mon, 24 Mar 2025 18:26:13 GMT

Minor changes

Expose the fast registry and allow triggering definition updates (7559015+janechu@users.noreply.github.com)

2.1.0

Thu, 13 Feb 2025 17:34:08 GMT

Minor changes

Update the ArrayObserver to better account for sort and reverse (7559015+janechu@users.noreply.github.com)

2.0.1

Wed, 11 Dec 2024 19:53:31 GMT

Patches

Patch bumping to apply latest tag to the package (7559015+janechu@users.noreply.github.com)
fast-element: Simplify conditional checks in element-controller (abaris@null.net)

2.0.0

Mon, 19 Aug 2024 22:04:19 GMT

Major changes

Update @microsoft/fast-element to major version (13071055+chrisdholt@users.noreply.github.com)

Changes

Fix CodeQL issues (7559015+janechu@users.noreply.github.com)
Adds support for FASTElement hydration (171390049+prabhujayapal@users.noreply.github.com)

2.0.0-beta.26

Fri, 18 Aug 2023 00:04:40 GMT

Changes

BREAKING: update fast-element export paths to include extensions (chhol@microsoft.com)
update fast-element exports to be explicit (chhol@microsoft.com)

2.0.0-beta.25

Sat, 12 Aug 2023 00:26:36 GMT

Changes

Prevent notification of array splices when operation does not mutate array values (nicholasrice@users.noreply.github.com)
Adds volatile binding support for JavaScript optional chaining syntax (nicholasrice@users.noreply.github.com)

2.0.0-beta.24

Fri, 16 Jun 2023 18:17:12 GMT

Changes

fix: update compiler to ensure first and last child references are defined (chhol@microsoft.com)
Adds 'else' template option to the when directive (nicholasrice@users.noreply.github.com)
fixed a bug where re-binding a ChildrenDirective instance would throw a runtime exception from the mutation handler (nicholasrice@users.noreply.github.com)
Update adoptedStyleSheets strategy to use push/splice when available to fix Safari 16.4 bug (nicholasrice@users.noreply.github.com)
fixes a bug where ChildrenDirective could not be used multiple times for the same element (nicholasrice@users.noreply.github.com)
fixed bug causing behaviors attached to stylesheets not to be removed when the stylesheet was removed (nicholasrice@users.noreply.github.com)

2.0.0-beta.23

Tue, 28 Mar 2023 22:14:10 GMT

Changes

docs: add missing API docs (rob@bluespire.com)
fix: correct types for a break in TypeScript 5 legacy decorators (rob@bluespire.com)

2.0.0-beta.22

Sat, 11 Mar 2023 00:09:48 GMT

Changes

feat: add Context.for (rob@bluespire.com)
feat: enable data binding in CSS (rob@bluespire.com)
add directives support for createElementTemplate (32497422+KingOfTac@users.noreply.github.com)
fix: clean up toJSON noop on core fast-element types (rob@bluespire.com)

2.0.0-beta.21

Tue, 14 Feb 2023 04:02:35 GMT

Changes

fix: cleanup types, docs, etc. in root source files of fast-element in preparation for release (rob@bluespire.com)
Remove un-necessary expression from StyleElementStrategy (nicholasrice@users.noreply.github.com)

2.0.0-beta.20

Wed, 11 Jan 2023 22:07:47 GMT

Changes

add nullableBooleanConverter for attributes (863023+radium-v@users.noreply.github.com)
update return type for dangerousHTML to DangerousHTMLDirective (chhol@microsoft.com)
chore: remove deprecated APIs from fast-element (rob@bluespire.com)
chore: cleanup fast-element interfaces (roeisenb@microsoft.com)
refactor(fast-element): replace dangerousHTML with html.partial (roeisenb@microsoft.com)
feat: add ability to inline templates (roeisenb@microsoft.com)

2.0.0-beta.19

Fri, 02 Dec 2022 01:18:22 GMT

Changes

feat: add kernel mode with isolation by default (roeisenb@microsoft.com)

2.0.0-beta.18

Tue, 15 Nov 2022 02:40:34 GMT

Changes

chore: move ViewBehaviorOrchestrator to utilities (roeisenb@microsoft.com)
feat: add new DOM Policy protection throughout (roeisenb@microsoft.com)

2.0.0-beta.17

Tue, 01 Nov 2022 23:26:26 GMT

Changes

fix: prevent circular reference errors when stringifying DOM nodes controlled by FAST's rendering engine (roeisenb@microsoft.com)

2.0.0-beta.16

Fri, 28 Oct 2022 20:44:44 GMT

Changes

Fixed bug preventing main component stylesheet behaviors from being connected during connectedCallback (nicholasrice@users.noreply.github.com)

2.0.0-beta.15

Tue, 25 Oct 2022 20:24:32 GMT

Changes

Updated the ElementController to connect behaviors prior to rendering element templates (nicholasrice@users.noreply.github.com)
Added support to fast-element to support element hydration and the defer-hydration attribute (nicholasrice@users.noreply.github.com)

2.0.0-beta.14

Fri, 14 Oct 2022 18:26:11 GMT

Changes

fix: tokenList bindings track adds and removes from multiple sources (roeisenb@microsoft.com)
refactor: remove duplication and re-organize binding behavior logic (roeisenb@microsoft.com)

2.0.0-beta.13

Mon, 10 Oct 2022 20:28:02 GMT

Changes

fix: prevent event callbacks when controller is not bound (roeisenb@microsoft.com)

2.0.0-beta.12

Thu, 06 Oct 2022 23:21:20 GMT

Changes

fix: repeat update view context positioning (roeisenb@microsoft.com)

2.0.0-beta.11

Wed, 05 Oct 2022 23:26:01 GMT

Changes

fix: removed a shadowRoot leak from ElementController (nicholasrice@users.noreply.github.com)

2.0.0-beta.10

Mon, 03 Oct 2022 23:44:38 GMT

Changes

fix: observation kernel missing binding observer disconnect method (roeisenb@microsoft.com)
feat: less surprising class bindings w/ more flexibility for developers (roeisenb@microsoft.com)
fix: don't allow registering FASTElement itself as a web component (roeisenb@microsoft.com)

2.0.0-beta.9

Wed, 28 Sep 2022 20:45:51 GMT

Changes

fix: ensure composed templates receive the existing execution context (roeisenb@microsoft.com)

2.0.0-beta.8

Tue, 27 Sep 2022 22:31:52 GMT

Changes

fix: correct view state when processing unbindables during rebind (roeisenb@microsoft.com)
fix: do not crash when null/undefined is provided literally in templates (roeisenb@microsoft.com)

2.0.0-beta.7

Fri, 23 Sep 2022 22:53:27 GMT

Changes

feat: improve parent typing and fix repeat context type bug (roeisenb@microsoft.com)
feat: prepare fast-element for scoped element registries (roeisenb@microsoft.com)
persist totalAvailableViews to compare against removeIndex (wendywendy@microsoft.com)
make ElementsFilter type arguments optional (863023+radium-v@users.noreply.github.com)
fix(fast-element): attributes properly located in inheritance hierarchy (roeisenb@microsoft.com)
Adds PendingTask community protocol (nicholasrice@users.noreply.github.com)
feat: new behavior and context API design (roeisenb@microsoft.com)
feat: implement getAsync code path for dependency injection (roeisenb@microsoft.com)

2.0.0-beta.6

Thu, 01 Sep 2022 21:53:34 GMT

Changes

feat: add new state, ownedState, and computedState APIs (roeisenb@microsoft.com)

2.0.0-beta.5

Thu, 18 Aug 2022 20:46:10 GMT

Changes

Fix ExpressionObserer bug where watcher was not reset if the binding threw (nicholasrice@users.noreply.github.com)
make insertbefore noop in view (prudepixie@users.noreply.github.com)
make sure default options for recycle gets set in different scenarios (prudepixie@users.noreply.github.com)
refactor: remove dependency of DI on FASTElement (roeisenb@microsoft.com)
add subpath export for package.json to packages (32497422+KingOfTac@users.noreply.github.com)
change default array strategy to merge strategy, update repeat directive (prudepixie@users.noreply.github.com)
assert FASTElement's type so that instanceof behavior is consistent with other class implementations (nicholasrice@users.noreply.github.com)

2.0.0-beta.4

Mon, 18 Jul 2022 21:10:01 GMT

Changes

feat: extract all error messages from context and DI (roeisenb@microsoft.com)
feat: introduce new binding API (roeisenb@microsoft.com)
Enabled DOM Container fallback functions when a container cannot be located. (roeisenb@microsoft.com)
feat: add render directive, renderWith decorator, and RenderInstruction (roeisenb@microsoft.com)
only store removed views if it can't be reused right away (prudepixie@users.noreply.github.com)
fix: enable createElementTemplate to have undefined attributes (32497422+KingOfTac@users.noreply.github.com)
use index to track reusable views (prudepixie@users.noreply.github.com)
feat: enable render, repeat, and when template helpers to handle static data in addition to the already supported dynamic bindings (roeisenb@microsoft.com)
fix: FASTElementDefinition#isDefined should be true only after define (roeisenb@microsoft.com)
feat: move testing and dependency injection to fast-element (roeisenb@microsoft.com)
fix: warn when host bindings are accidentally applied on non CE views (roeisenb@microsoft.com)
feat: perf and safety improvements to fast element definition (roeisenb@microsoft.com)

2.0.0-beta.3

Wed, 22 Jun 2022 20:17:50 GMT

Changes

fix: correct aspect type for content that looks like an attribute (nicholasrice@users.noreply.github.com)

2.0.0-beta.2

Wed, 15 Jun 2022 17:41:10 GMT

Changes

doc: add note to FASTElement.metadata API (roeisenb@microsoft.com)
when recycle is set to false while itemBinding stays the same, views should be recreated (wendy.hsu@microsoft.com)
feat: simplify execution context to align closer with v1 (roeisenb@microsoft.com)
feat: ergo improvements to context, array length, and metadata (roeisenb@microsoft.com)
feat: move optional bindings out of rollup and list as exports (roeisenb@microsoft.com)
fix: make SyntheticViewTemplate type a string so it is generally usable (roeisenb@microsoft.com)
feat: implement W3C WC community context protocol and integrate with DI (roeisenb@microsoft.com)

2.0.0-beta.1

Wed, 01 Jun 2022 17:53:14 GMT

Changes

DOM - Tree Walker methods are no longer used and are thus removed. The API for removing child nodes has been removed as well since it was only used in one place and could be inlined. The helper createCustomAttributePlaceholder() no longer requires an attribute name. It will be uniquely generated internally. (roeisenb@microsoft.com)
class - Bindings to class are now more nuanced. Binding directly to class will simply set the className property. If you need to bind to class knowing that manual JS will also manipulate the classList in addition to the binding, then you should now bind to :classList instead. This allows for performance optimizations in the simple, most common case. (roeisenb@microsoft.com)
Behavior and ViewBehavior - Behavior now requires an ExecutionContext for unbind. Behaviors can be used for elements or views. ViewBehavior has been introduced for use exclusively with views, and provides some optimization opportunities. (roeisenb@microsoft.com)
RefBehavior has been replaced with RefDirective. The directive also implements ViewBehavior allowing a single directive instance to be shared across all template instances that use the ref. (roeisenb@microsoft.com)
Removed SlottedBehavior and ChildrenBehavior have been replaced with SlottedDirective and ChildrenDirective. These directives allow a single directive instance to be shared across all template instances that use the ref. (roeisenb@microsoft.com)
Removed AttachedBehaviorHTMLDirective and AttachedBehaviorType since they are no longer used in the new directive/behavior architecture for ref, slotted, and children. (roeisenb@microsoft.com)
Renamed Notifier#source to Notifier#subject to align with other observable terminology and prevent name clashes with BindingObserver properties. (roeisenb@microsoft.com)
feat: create unified API for parsing markers (roeisenb@microsoft.com)
allow null values in attributeChangedCallback (nicholasrice@users.noreply.github.com)
feat: add splice strategies for array observation (roeisenb@microsoft.com)
feat: handle existing shadow roots when upgrading (roeisenb@microsoft.com)
fix: enable safer type inference on the repeat helper (roeisenb@microsoft.com)
Set prerelease version (nicholasrice@users.noreply.github.com)
refactor: separate update queue from DOM and fix architectural layers (roeisenb@microsoft.com)
feat: aspected html directive exposes metadata (roeisenb@microsoft.com)
HTMLDirective - The targetIndex: number property has been replaced by a targetId: string property. The createBehavior method no longer takes a target Node but instead takes a BehaviorTargets instance. The actual target can be looked up on the BehaviorTargets instance by indexing with the targetId property. (roeisenb@microsoft.com)
compileTemplate() - Internals have been significantly changed. The implementation no longer uses a TreeWalker. The return type has change to an HTMLTemplateCompilationResult with different properties. (roeisenb@microsoft.com)
refactor: move template/style resolution to lazy getter (roeisenb@microsoft.com)
refactor: enable pluggable template compiler for SSR scenarios (roeisenb@microsoft.com)
feat: enable pluggable style handling strategies (roeisenb@microsoft.com)
fix(fast-element): do not notify splices for changes pre-subscription (roeisenb@microsoft.com)
feat: new directive registration/identification model (roeisenb@microsoft.com)
fix: prevent duplicative array observation patch (roeisenb@microsoft.com)
Adds Aspect as public export (nicholasrice@users.noreply.github.com)
feat: expose official Markup and Parser APIs (roeisenb@microsoft.com)
refactor: refine binding mode types (roeisenb@microsoft.com)
feat: add two-way binding (roeisenb@microsoft.com)
fix: defend against for/in use on arrays (roeisenb@microsoft.com)
fix: merge bug related to moved APIs (roeisenb@microsoft.com)
feat: enable multiple instances of fast-element on a page at once (roeisenb@microsoft.com)
Upgrade TypeScript (nicholasrice@users.noreply.github.com)
enumerate fast-element package as a ES module package (nicholasrice@users.noreply.github.com)
feat: enable array length observation (roeisenb@microsoft.com)
feat: add utilities and hooks, and change exports (roeisenb@microsoft.com)
refactor: new design for execution context (roeisenb@microsoft.com)
chore: fast-element package and build modernization (roeisenb@microsoft.com)
feat: new CSSDirective design (roeisenb@microsoft.com)
chore: configure fast-element for internal stripping (roeisenb@microsoft.com)
feat: enable synchronous dom updates for SSR (roeisenb@microsoft.com)
refactor: extract polyfill and polyfill-like code to an optional module (roeisenb@microsoft.com)
feat: add warn/error message infrastructure (roeisenb@microsoft.com)
View and HTMLView - Type parameters added to enable strongly typed views based on their data source. The constructor of HTMLView has a new signature based on changes to the compiler's output. Internals have been cleaned up and no longer rely on the Range type. (roeisenb@microsoft.com)
ElementViewTemplate, SyntheticViewTemplate, and ViewTemplate - Added type parameters throughout. Logic to instantiate and apply behaviors moved out of the template and into the view where it can be lazily executed. Removed the ability of the render method to take a string id of the node to render to. You must provide a node. (roeisenb@microsoft.com)

1.10.2

Tue, 24 May 2022 07:10:02 GMT

Patches

fix(fast-element): do not notify splices for changes pre-subscription (roeisenb@microsoft.com)

1.10.1

Tue, 03 May 2022 07:15:44 GMT

Patches

Upgraded api-extractor (44823142+williamw2@users.noreply.github.com)

1.10.0

Wed, 27 Apr 2022 07:21:09 GMT

Minor changes

update to typescript 4.6.2 and update ARIAMixin typings (chhol@microsoft.com)

1.9.0

Wed, 06 Apr 2022 07:12:42 GMT

Minor changes

convert fast-element to type:module (nicholasrice@users.noreply.github.com)

1.8.0

Tue, 08 Mar 2022 07:12:45 GMT

Minor changes

feat: enable multiple fast-element instances in browser at once (roeisenb@microsoft.com)

1.7.2

Fri, 25 Feb 2022 17:09:32 GMT

Patches

fix: defend against for/in use on arrays (roeisenb@microsoft.com)

1.7.1

Thu, 24 Feb 2022 22:21:55 GMT

Patches

fix: prevent duplicative array observation patch (roeisenb@microsoft.com)

1.7.0

Sun, 23 Jan 2022 07:13:56 GMT

Minor changes

add recyle option to repeat directive (scomea@microsoft.com)

1.6.2

Sun, 31 Oct 2021 07:17:45 GMT

Patches

update fast eslint package version (chhol@microsoft.com)

1.6.1

Wed, 13 Oct 2021 22:45:16 GMT

Patches

build(fast-element): exclude empty js files from esm index.js (markwhitfeld@users.noreply.github.com)

1.6.0

Fri, 08 Oct 2021 19:53:11 GMT

Minor changes

feat(fast-element): expose a method for processing the update queue (roeisenb@microsoft.com)

1.5.1

Wed, 08 Sep 2021 07:16:17 GMT

Patches

perf(Controller): reduce object allocation needed for isConnected prop (roeisenb@microsoft.com)

1.5.0

Fri, 27 Aug 2021 14:14:26 GMT

Minor changes

Adds capability to Observable to subscribe to any observable property change for an object (nicholasrice@users.noreply.github.com)
ensure HTMLStyleElement DOM order matches call addStylesTo() call order (nicholasrice@users.noreply.github.com)

1.4.2

Thu, 26 Aug 2021 07:17:43 GMT

Patches

feat(fast-element): make the task queue resilient to task exceptions (roeisenb@microsoft.com)

1.4.1

Wed, 28 Jul 2021 07:17:22 GMT

Patches

implement patch to work around Angular optimization bug (nicholasrice@users.noreply.github.com)

1.4.0

Fri, 21 May 2021 17:48:08 GMT

Minor changes

Add cssPartial template function to facilitate partial CSS abstractions. (nicholasrice@users.noreply.github.com)

1.3.0

Wed, 19 May 2021 23:37:36 GMT

Minor changes

undefined (nicholasrice@users.noreply.github.com)
fix: ensure that custom events are cancelable by default (roeisenb@microsoft.com)
perf: improve startup time and reduce library size (roeisenb@microsoft.com)

1.0.2 (2021-04-06)

Bug Fixes

ensures proper re-observation and notification of a disconnected BindingObserver (#4477) (e315a69)

1.0.1 (2021-03-16)

Bug Fixes

ensure embedded templates dispose correctly (#4432) (cb8ae10)

1.0.0 (2021-03-06)

refactor(fast-element)!: rename Directive, disambiguate types, and reorganize (#4414) (a96d364), closes #4414

Features

adds CSSDirective for use with the css tagged template literal (#4383) (6928afa)

BREAKING CHANGES

rename Directive and other types to disambiguate

0.22.2 (2021-02-08)

Note: Version bump only for package @microsoft/fast-element

0.22.1 (2021-02-08)

Note: Version bump only for package @microsoft/fast-element

0.22.0 (2021-01-30)

Bug Fixes

increase sophistication of behavior binding and unbinding (#4288) (9c24ee6)
repeat: observe arrays after unbound then rebound (#4211) (cec8e69)

Features

add support for attachment test to ElementStyles (#4289) (df6f765)

0.21.1 (2020-12-16)

Note: Version bump only for package @microsoft/fast-element

0.21.0 (2020-12-02)

Features

add default slot change method (#4148) (5e9fb05)

0.20.0 (2020-11-19)

Bug Fixes

fast-element: ensure all nodes removed in repeat when array emptied (#4073) (cacfefe)
fast-element: remove mergeSplice array length cache (#4067) (751eef8)

Features

add select component (#4074) (6984027)
convert FormAssociated to a constructable function (#4115) (da8d54b)
makes Controller.isConnected an observable property (#4093) (3d49aa2)
fast-element: introduce NamedTargetDirective for extensibility (#4079) (c93bc26)
support HTMLStyleElement from Controller.addStyles and Controller.removeStyles (#4043) (cf20187)

0.19.1 (2020-10-14)

Note: Version bump only for package @microsoft/fast-element

0.19.0 (2020-09-28)

Bug Fixes

fast-element: enable subtree observation in the children decorator (#3945) (c69c7d9)

Features

fast-element: enable parent context references in repeat scenarios (#3948) (0b2234b)

0.18.0 (2020-09-10)

Bug Fixes

fast-element: better global support for older browsers (#3864) (61e85d8)
fast-element: workaround for adoptedStyleSheets Chromium bug (#3838) (1b6570a)

Features

fast-element: enable custom element to accept a styles array (#3871) (ae611a9)

0.17.0 (2020-08-27)

Bug Fixes

fast-element: add globalThis polyfill to fix trustedTypes polyfill (#3797) (e848800)
fast-element: do not remove user comments when compiling templates (#3786) (0478709)
fast-element: observable callbacks on sub-classes should be invoked (#3768) (969d5dd)

Features

fast-element: improve trustedTypes to not use globalThis (#3784) (5eca0a8)

0.16.0 (2020-08-13)

Bug Fixes

use higher bits for DOM marker (#3649) (2d1acd8)

Features

fast-element: move template instance timing and enable dynamic templates and styles (#3621) (2e73088)

0.15.2 (2020-07-31)

Note: Version bump only for package @microsoft/fast-element

0.15.1 (2020-07-23)

Bug Fixes

rollup minify selectors should retain spaces (#3524) (cbdfc45)

0.15.0 (2020-07-14)

Bug Fixes

fast-element: style element styles should work with the document (#3489) (d288390)

Features

simplify rollup configs and compress tagged template literals (#3452) (7533e92)
update typescript version and remove utility types dependencies for react packages (#3422) (09d07b5)

0.14.0 (2020-07-02)

Bug Fixes

fast-element: do not notify when binding observer is disconnected (#3418) (dbf3093)

Features

fast-element: support bindings and observables with volatile dependencies (#3402) (a00a907)

0.13.0 (2020-06-26)

Bug Fixes

fast-element: default event handler behavior should be no capture (#3337) (a59e4df)
fast-element: export missing elements filter helper (#3331) (46de565)

Features

fast-element: enable CSSStyleSheet and string to be used as styles (#3345) (70e2f7f)
fast-element: expand element filter to support selectors (#3374) (f275366)

0.12.0 (2020-06-17)

Features

fast-element: enable children and slotted filters (#3323) (224df54)

0.11.0 (2020-06-15)

Bug Fixes

correct anchor and button stylesheets (#3308) (78feda2)
fast-element: generalize value converter and move out of beta (#3267) (14706c9)
fast-element: seal the default execution context (#3268) (131cacb)
corrects behavior of style removal (#3261) (e37b7ab)

Features

fast-element: enable repeat template binding (#3287) (00129bc)

0.10.1 (2020-06-09)

Note: Version bump only for package @microsoft/fast-element

0.10.0 (2020-06-05)

Features

fast-element: add content composition (#3182) (26c59ea)
website: new docusaurus v2 setup with launch toc configuration (#3159) (f12ba16)

0.9.0 (2020-05-18)

Bug Fixes

fast-element: every third subscriber not registered (#3086) (bd26083)
fast-element: html helper should handle literal and directive interpolated together (#3106) (627f06c)
add exports that were removed during circular reference refactor #3038 (eb1cb91)

Features

fast-element: more granular content compilation with tests (#3127) (c96fef2)
web-components: new build/test/docs setup (#3156) (51d909a)

0.8.1 (2020-04-29)

Bug Fixes

removes circular dependencies from web-component packages (#3037) (0f84942)

0.8.0 (2020-04-27)

Bug Fixes

fast-element: attr bindings preserved during upgrade (#3010) (e9b14cc)

Features

fast-element: add a render method to templates for pure templating (#3018) (c4ac6b2)

0.7.0 (2020-04-22)

Bug Fixes

fast-element: remove unnecessary references (#2966) (5b724c2)
align Fast to FAST (#2950) (94c8744)

Features

fast-element: add functioning execution context (#2935) (707d4e7)
fast-element: safe class binding (#2957) (e06d73c)

0.6.0 (2020-04-10)

Bug Fixes

fast-element: always reflect latest value to attribute (#2903) (48cca59)
fast-element: batch attr reflect (#2885) (e863752)
fast-element: ensure node exists when checking if it's a marker (#2876) (ae656b8)
fast-element: only use Range for batch disposal (#2901) (7e5bf5c)
fast-element: preserve observable values from before upgrade (#2889) (d84884a)

Features

fast-element: add directives for children and slotted references (#2896) (5dc8911)
fast-element: add multi property binding support (#2911) (46049ea)
design system provider and recipe implementation (#2860) (8c04e15)

0.5.0 (2020-04-02)

Features

fast-element: add trusted types for HTML (#2855) (69d44a2)

0.4.0 (2020-03-30)

Bug Fixes

attribute bindings in fast components (#2847) (0d25806)
fast-element: ensure host attributes have a target name (#2846) (4bd99c9)

Features

fast-element: attribute/property binding revamp (#2843) (ffe7a57)
add progress web component (#2828) (5f2be52)

0.3.1 (2020-03-25)

Bug Fixes

fast-element: add docs and ensure boolean attrs true when empty (#2833) (4bf2c41)

0.3.0 (2020-03-25)

Bug Fixes

fast-element: type fixes, api docs, and one op order correction (#2810) (0548e89)
view: ensure first/last child correct after removing view (#2819) (7d82ddc)

Features

fast-element: boolean attributes and type conversion (#2829) (03f64cd)

Performance Improvements

fast-element: optimize view removal and disposal (#2806) (59cc3be)

0.2.1 (2020-03-18)

Note: Version bump only for package @microsoft/fast-element

0.2.0 (2020-03-13)

Bug Fixes

fast-element: undefined/null should remove the html attribute (#2749) (82dbf74)

Features

fast-element: attached behaviors (#2784) (170eed7)
fast-element: base shadow and element options on defaults (#2782) (73fabda)
fast-element: enable host instructions (#2760) (8675585)
fast-element: streamline custom event emit (#2777) (b3250ec)
export when from the root of fast-element (#2739) (3e290d3)
fast-element: simpler element definition without decorators (#2730) (d89e9ca)

Performance Improvements

fast-element: simplify expressions (#2755) (e1c2bfa)

0.1.0 (2020-02-28)

Bug Fixes

fast-element: prevent duplicate subscription and queuing (#2678) (99a24d8)

Features

fast-element: add initial source from prototype (#2675) (f8c3226)

Performance Improvements

fast-element: improve subscribe/unsubscribe by reducing alloc (#2679) (1957c6f)
fast-element: improve synthetic view creation speed (#2680) (2e2b549)
fast-element: new strategy for array observation and repeat (#2684) (6f2f272)