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@atelier-wb/svelte

v0.12.0-beta.4

Published

Svelte bindings to test your svelte components

Downloads

82

Readme

Atelier - Svelte bindings

Weclome to the Atelier!

This package contains bindings for Svelte UI framework. They allow you to test your Svelte components in isolation.



Getting started

Create a file with .tools.svelte extension.

<script>
  import { Tool } from '@atelier-wb/svelte'
  import MyComponent from './MyComponent.svelte'
</script>

<Tool
  name="My Awesome Component"
  component={MyComponent}
/>

That's it! Now configure Atelier with Vite, and browse to http://localhost:3000/atelier: you'll see your component in action!

Each tool operates on one of your component, and can:

  • controls its properties
  • listen to its events

Tweak properties

To enable property control, just initialize them in your tool's props:

<Tool
  name="My Awesome Component"
  component={MyComponent}
  props={{ prop1: 'my component first prop', prop2: 42 }}
/>

Atelier will automatically creates controls in the "Properties" tab so you can change your property values.

It supports numbers, booleans, strings, arrays and objects.

Functions and Svelte stores can not be configured from Atelier.


Events reporting

To listen to your event properties (either DOM native or custom), write their names in an events array:

<Tool
  name="My Awesome Component"
  component={MyComponent}
  events={['click', 'custom-event']}
/>

Once they'll be triggered, Atelier will show the time, event name and details in the "Events" tab.

It is automatically cleared when opening a different tool, and there is a button to do it manually.

Note: you can also "programmaticaly" record an event:

<script>
  import { Tool, recordEvent } from '@atelier-wb/svelte'
  import MyComponent from './MyComponent.svelte'
</script>

<Tool
  name="My Awesome Component"
  props={{
    myComponentFunctionProp: () => recordEvent('programmatic-event', 'event arg 1', 'arg could be anything')
  }}
  component={MyComponent}
/>

Slots and side markup

If your component uses slots, or needs some companion markup, you can use <Tool> as templates:

<Tool
  name="My Awesome Component"
  props={{ prop1: 'my component first prop', prop2: 42 }}
  let:props
  let:handleEvent
>
  <div>You can put any markup before the component.<div>

  <MyComponent
    {...props}
    on:click={handleEvent}
    on:custom-event={handleEvent}
  >
    <span>this goes into YOUR component</span>
  </MyComponent>

  <div>You can also have markup after.<div>
</Tool>

Please note key differences:

  • tool does not need component={MyComponent} any more

  • tool has let:props, and your component has {...props}. This allows Atelier to configure properties even if your component is "burried" into the template

  • tool has let:handleEvent, and your component binds it to specific event. This allows Atelier to receive any event you'd like.

If you want to tweak properties, don't forget to initialize them on Tool: otherwise Atelier will not generates the corresponding controls.


Setup and teardown code

If you need to run code every time your tool loads, you can use setup function:

<Tool
  name="My Awesome Component"
  component={MyComponent}
  props={{ prop1: 'my awesome prop' }}
  setup={async ({ name, props }) => {
    return newProps
  }}
/>

The setup function:

  • could either be synchronous or asynchronous.

  • receives a single object parameter, with the name and props keys (the ones you passed to <Tool/>)

  • can return new props for your component. If setup() returns nothing, props from the markup will be used.

You can also use teardown function:

<Tool
  name="My Awesome Component"
  component={MyComponent}
  teardown={async name => {}}
/>

The teardown function:

  • could either be synchronous or asynchronous.

  • receives the component name (the one you passed to <Tool/>)


Tool boxes

You can add as many <Tool/> in the same file as you want. But there may be a lot of code duplication!

<ToolBox/> can solve this issue:

<ToolBox name="My Awesome Component" component={MyComponent}>
  <Tool name="Primary" props={{ color: 'red', primary: true }} />
  <Tool name="Secondary" props={{ color: 'blue' }} />
</ToolBox>

This helps you easily test variations of the same component.

Important highlights:

  • a tool's full name is its tool box's name + its own name. In the example above: My Awesome Component / Primary

  • a tool box supports exactly the same properties as tool, with some specificities:

    • name are concatenated, as explained above.

    • tool's component override tool box.

    • props are merged.

    • events are merged.

    • tool box's setup() runs before the tool's setup(). The result of the primer becomes props parameter of the later.

    • tool box's teardown() runs after the tool's teardown().

  • tool box do not support templates.


Examples

Now that you know everything, you may want some real examples.

You'll find some in Atelier's UI tests