solid-styled

Reactive stylesheets for SolidJS

Install

npm i solid-styled
npm i -D postcss

yarn add solid-styled
yarn add -D postcss

pnpm add solid-styled
pnpm add -D postcss

Features

Render stylesheets only once
Fine-grained reactive CSS properties
Scoped stylesheets
:global selector
@global at-rule
SSR
Near zero-runtime
<style jsx>

Usage

`css`

Use the css tagged template for writing stylesheets.

import { css } from 'solid-styled';

function Title() {
  css`
    h1 {
      color: red;
    }
  `;

  return <h1>Hello World</h1>;
}

The template is also reactive. It works by replacing all templating values with a CSS variable. This allows the stylesheet to be only rendered once and can be shared by multiple components of the same scope.

import { css } from 'solid-styled';

function Button() {
  const [color, setColor] = createSignal('red');
  css`
    button {
      color: ${color()};
    }
  `;

  return (
    <button onClick={() => {
      setColor((c) => (c === 'red' ? 'blue' : 'red'));
    }}>
      Current color: {color()}
    </button>
  );
}

By default, all styles are scoped to its component and cannot leak into another component. The scoping only applies to all DOM nodes that can be found in the component, including the children of the external components.

import { css } from 'solid-styled';

function ForeignTitle() {
  return <h1>This is not affected</h1>;
}

function Title() {
  css`
    h1 {
      color: red;
    }
  `;

  return (
    <>
      <h1>This is affected.</h1>
      <ForeignTitle />
      <Container>
        <h1>This is also affected.</h1>
      </Container>
    </>
  )
}

`:global`

Since all selectors in a given stylesheet are scoped by default, you can use the :global pseudo selector to opt-out of scoping:

import { css } from 'solid-styled';

function Feed(props) {
  css`
    div > :global(* + *) {
      margin-top: 0.5rem;
    }
  `;

  return (
    <div>
      <For each={props.articles}>
        {(item) => (
          // This item is affected by the CSS of the Feed component.
          <FeedArticle data={item} />
        )}
      </For>
    </div>
  );
}

`@global`

You can use @global instead of :global if you want to declare multiple global styles

css`
  /* this is global */
  @global {
    body {
      background-color: black;
    }

    main {
      padding: 0.5rem;
    }
  }

  h1 {
    color: white;
  }
`;

Forward scope

Since solid-styled scopes DOM elements and not components by default, it doesn't affect things like <Dynamic>. Using use:solid-styled, we can forward the current scope/sheet to the component.

css`
  * {
    color: red;
  }
`;

<Dynamic component={props.as} use:solid-styled>
  {props.children}
</Dynamic>

which compiles into

useSolidStyled('xxxx', '*[s\\:xxxx]{color:red}');

<Dynamic component={props.as} s:xxxx style={vars()}>
  {props.children}
</Dynamic>

`<style jsx>`

Inspired by styled-jsx.

Use <style jsx> instead of css for declaring styles in JSX expressions. Both <style jsx> and css functions the same.

function Button() {
  const [color, setColor] = createSignal('red');
  return (
    <>
      <style jsx>
        {`
          button {
            color: ${color()};
          }
        `}
      </style>
      <button onClick={() => {
        setColor((c) => (c === 'red' ? 'blue' : 'red'));
      }}>
        Current color: {color()}
      </button>
    </>
  );
}

You can also use <style jsx global> for declaring global styles.

The main motivation for writing an alternative way of declaring styles with <style jsx> is to facilitate the migration from solid-styled-jsx to solid-styled. Possibly, some developers may as well use <style jsx> because of their familiarity with adding the styles inside the JSX.

SSR

`<StyleRegistry>`

For SSR, you can pass an array to the styles prop of <StyleRegistry>. This array collects all of the "critical" (initial render) stylesheets, that which you can render as a string with renderSheets.

import { renderSheets } from 'solid-styled';

const styles = [];

renderToString(() => (
  <StyleRegistry styles={styles}>
    <App />
  </StyleRegistry>
));

// Render sheets
// You can use the resulting sheet by inserting
// it into an HTML template.
const styles = renderSheets(styles);

CSS Processing

solid-styled uses LightningCSS to preprocess CSS templates as well as apply CSS scoping and transformations. By default, CSS Nesting and Custom Media Queries are enabled by default.

Limitations

Scoping css can only be called directly on components. This is so that the Babel plugin can find and transform the JSX of the component. Global css (i.e. :global or @global) can be used inside other functions i.e. hooks, utilities.
Dynamic styles are only limited to CSS properties.

lxsmnsyc/solid-styled

lxsmnsyc

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