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This addon provides a polyfill for angle bracket invocation syntax as described in RFC 311 and RFC 457. It's the same components you know and love, no longer surrounded by mustaches. \o/

Build Status


ember install ember-angle-bracket-invocation-polyfill

You will additionally need to ensure ember-cli-htmlbars-inline-precompile is at least version 1.0.3.


The best usage guide are the RFCs themselves (emberjs/rfcs#311 emberjs/rfcs#457), but here are a few examples of "before"/"after" to whet your appetite:


{{site-header user=this.user class=(if this.user.isAdmin "admin")}}

{{#super-select as |s|}}
  {{#each this.availableCountries as |country|}}
    {{#s.option value=country}}{{}}{{/s.option}}


<SiteHeader @user={{this.user}} class={{if this.user.isAdmin "admin"}} />

<SuperSelect @selected={{}} as |s|>
  {{#each this.availableCountries as |country|}}
    <s.option @value={{country}}>{{}}</s.option>

Supported Features

  • Supports invoking components via angle brackets using TitleCase
  • Supports invoking components via angle brackets with self-closing syntax
<FooBar />
  • Supports invoking components via angle brackets using paths
  • Supports invoking components via angle brackets using yielded block params
{{#with (component 'foo-bar') as |Foo|}}
  • Supports passing arguments into invoked components with @ prefix
<FooBar @title={{whateverHere}}></FooBar>
  • Supports passing attributes to be added to the root element of the component without @ prefix
<FooBar data-test-foo-bar></FooBar>
  • Supports using has-block inside the invoked component to determine if a block was provided
<FooBar /> {{! checking `has-block` inside would be `false`}}

<FooBar></FooBar> {{! checking `has-block` inside would be `true`}}
  • Supports yielding block params from inside the invoked component
<FooBar as |qux|>{{qux}}</FooBar>
  • Supports passing ...attributes into another angle bracket invocation
<FooBar ...attributes>
  • Supports passing ...attributes into a non-component element
<div ...attributes></div>
  • Supports passing ...attributes into tagless components
  • Supports invoking single word components:
<Title />
  • Supports invoking components nested in subfolders:
<Foo::Bar />
  • Completely inert when running Ember 3.10 or higher
  • Supports Ember 2.12, 2.16, 2.18, 3.1, 3.2, 3.3, 3.4, 3.8, 3.9
  • Test all the features listed above 😘


Any addons wanting to use angle bracket components (in either addon/ or addon-test-support/) need to install ember-angle-bracket-invocation-polyfill as a dependency.


There are no known limitations, all features described in the RFC are polyfilled.



  • git clone <repository-url>
  • cd ember-angle-bracket-invocation-polyfill
  • yarn install


  • yarn lint:js
  • yarn lint:js --fix

Running tests

  • ember test – Runs the test suite on the current Ember version
  • ember test --server – Runs the test suite in "watch mode"
  • ember try:each – Runs the test suite against multiple Ember versions

Running the dummy application

For more information on using ember-cli, visit


This project is licensed under the MIT License.