svelte-style-directive

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svelte-style-directive

(★ 17)

A custom Svelte preprocessor to add support for style directive.

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// repository documentation

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## Archive Note
Archived because Svelte added support for style directives.

- [What is it?](#what-is-it)
- [Usage](#usage)
- [Why?](#why)
- [Performance](#performance)
- [Examples](#examples)
  - [Using state](#using-state)
  - [CSS variables](#css-variables)

## What is it?
> A custom [Svelte](https://svelte.dev) preprocessor to add support for `style` directive.

```svelte
<span
  style:font-size="16px"
  style:color={color}
  style:text-transform="lowercase"
  >
```

## Usage
Add to `package.json`
```
npm i --save-dev svelte-style-directive
```

Add to `rollup.config.js`
```js
import svelte from 'rollup-plugin-svelte'
import { svelteStyleDirective } from 'svelte-style-directive'

export default {
  plugins: [
    svelte({
      preprocess: [
        svelteStyleDirective()
      ]
    })
  ]
}
```

## Why?

It's very convenient to apply classes based on state/prop in Svelte.

```svelte
<script>
  let hidden = false;
  let bold = true;
</script>

<span class:hidden={hidden} class:bold={bold}>Heading</span>
```

`class` directive makes things much easier.
But, what if you wanted to make this work with `style` attributes?
This plugin adds support `style` directive to achieve similar functionality.

So you can do this:
```svelte
<script>
  let bold = true;
  let color = 'red';
</script>

<span style:font-weight={bold} style:color={color}>Heading</span>
```
instead of this:
```svelte
<script>
  let bold = true;
  let color = 'red';
</script>

<span style={`${bold ? 'font-weight: bold; ' : ''}${color ? 'color: red; ' : ''}`}>Heading</span>
```
It also works for [CSS Variables](#css-variables)!

## Performance
As this is a preprocessor, it is just a syntactic sugar. It has no runtime overhead.

## Examples

### Using state
```svelte
<script>
  let progress = 0.5;
</script>

<div class="progress-bar">
  <div class="cursor" style={`left: ${progress * 100 + '%'};`}></div>
</div>

<div class="progress-bar">
  <div class="cursor" style:left={progress * 100 + '%'}></div>
</div>

```

### CSS variables
```svelte
<script>
  let textColor = '#9c9c9c';
</script>

<div style:--text-color={textColor}>
  <span>Some text with color</span>
</div>
```

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