Introducing Template Imports!

Chris Hewell Garrett

@pzuraq

Agenda

2

3

What do they look like?

How do they work?

1

What are template imports?

<MyComponent/>

{{some-helper}}

<div {{a-modifier}}>

</div>
import MyComponent from './my-component';
import someHelper from '../helpers/some-helper';
import aModifier from '../modifiers/a-modifier';
  • Better DX, integration with editors and tooling
  • More flexible file layout
  • Better for bundling and build tools
  • Simplifies internals, better performance

Benefits

Agenda

2

3

What do they look like?

How do they work?

1

What are template imports?

---
import MyComponent from './my-component';
import someHelper from './some-helper';
import aModifier from './a-modifier';
---

<MyComponent/>

{{someHelper @arg1 @arg2}}

<div {{aModifier}}>

</div>
<script>
  import MyComponent from './my-component';
  import someHelper from './some-helper';
  import aModifier from './a-modifier';
<script>
<template>
  <MyComponent/>

  {{someHelper @arg1 @arg2}}

  <div {{aModifier}}>
  
  </div>
</template>
import { hbs } from 'ember-cli-htmlbars';
import MyComponent from './my-component';
import someHelper from './some-helper';
import aModifier from './a-modifier';

export default hbs`
  <MyComponent/>

  {{someHelper @arg1 @arg2}}

  <div {{aModifier}}>
  
  </div>
`;

Ship a low level API instead!

import { precompileTemplate } from '@ember/template-compilation';
import MyComponent from './my-component';
import someHelper from './some-helper';
import aModifier from './a-modifier';

export default precompileTemplate(
  `
    <MyComponent/>

    {{someHelper @arg1 @arg2}}

    <div {{aModifier}}>
  
    </div>
  `,
  {
    strictMode: true,
    scope: { MyComponent, someHelper, aModifier } 
  }
);

Available in Ember 3.25+

Shared community addon

$ ember install ember-template-imports

PRs welcome!

Agenda

2

3

What do they look like?

How do they work?

1

What are template imports?

// hello.js
import { hbs } from 'ember-template-imports';

export default hbs`
  Hello, world!
`;
// hello.gjs

<template>
  Hello, world!
</template>

Basic template-only component

// hello.js
import { hbs } from 'ember-template-imports';
import Greeting from './greeting';
import currentTime from './current-time';

export default hbs`
  <Greeting @name={{@name}}/>!

  It is currently {{currentTime}}.
`;
// hello.gjs
import Greeting from './greeting';
import currentTime from './current-time';

<template>
  <Greeting @name={{@name}}/>!

  It is currently {{currentTime}}.
</template>

Using imported values

// hello.js
import { hbs } from 'ember-template-imports';
import { helper } from '@ember/component/helper';
import moment from 'moment';

const Greeting = hbs`
  Hello, {{@name}}!
`

const currentTime = helper(() => {
  return moment().format('h:mm:ss a');
});

export default hbs`
  <Greeting @name={{@name}}/>

  It is currently {{currentTime}}.
`;
// hello.gjs
import { helper } from '@ember/component/helper';
import moment from 'moment';

const Greeting = <template>
  Hello, {{@name}}!
</template>

const currentTime = helper(() => {
  return moment().format('h:mm:ss a');
});

<template>
  <Greeting @name={{@name}}/>!

  It is currently {{currentTime}}.
</template>

Defining values in the same file

// hello.js
import { hbs } from 'ember-template-imports';
import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';

export default class Hello extends Component {
  @tracked name = 'Tomster';
  
  static template = hbs`
    hello, {{this.name}}!
  `;
}
// hello.gjs
import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';

export default class Hello extends Component {
  @tracked name = 'Tomster';
  
  <template>
    hello, {{this.name}}!
  </template>
}

Adding state

Thank you!

Introducing Template Imports

By pzuraq

Introducing Template Imports

Have you ever found it hard to figure out where an Ember component is coming from? Which addon was it defined in again? Or have you ever wanted to structure your components folder a bit differently, so that related components are kept together? Have you possibly even wanted to define a few components, helpers, and modifiers in the same file, because they were so related to each other? Template imports are a brand new feature in Ember that allow you to do just that! In this talk, we'll explore these new patterns and capabilities, and see how you can use them in your app today!

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