Web Dev Server plugin to import css files as JavaScript tagged-template literal objects.
The "Lit" stands for "Literal"
You can use it to import CSS for various libraries like lit-element,
@microsoft/fast-element, or others.
No. This is an optional package who's sole purpose is to make it easier to write
CSS-in-CSS while working on lit-element projects. You can just as easily write
your CSS in some 'styles.css.js' modules a la:
import { css } from 'lit-element';
export default css`:host { display: block; }`;And this may actually be preferred.
Hopefully this package will become quickly obsolete when the CSS Modules Proposal (or something like it) is accepted and implemented.
In the mean time, enjoy importing your CSS into your component files.
| Name | Accepts | Default |
|---|---|---|
include |
Array of glob of files to include. | ['**/*.css'] |
exclude |
Array of glob of files to exclude. | undefined |
cssnano |
Boolean or Object of cssnano options. | false |
specifier |
Package to import css from |
lit |
tag |
Name of the template-tag function | css |
transform |
Optional function (sync or async) which transforms css sources (e.g. postcss) | x => x |
import litcss from 'web-dev-server-plugin-lit-css';
export default {
...config,
plugins: [
litcss({
include: ['**/elements/**/*.css'],
exclude: ['**/docs/**/*.css'],
cssnano: true,
})
]
}Then import your CSS:
:host {
display: block;
}
h1 {
color: hotpink;
}import { LitElement, html } from 'lit';
import { customElement } from 'lit/decorators.js';
import style from './css-in-css.css';
@customElement('css-in-css')
class CSSInCSS extends LitElement {
static readonly styles = [style];
render() {
return html`<h1>It's Lit!</h1>`;
}
}plugins: [
litcss({ specifier: '@microsoft/fast-element' })
]import { FASTElement, customElement, html } from '@microsoft/fast-element';
import styles from './css-in-css.css';
const template = html<CSSinCSS>`<h1>It's Lit!</h1>`;
@customElement({ name: 'css-in-css', template, styles })
class CSSinCSS extends FASTElement {}To load scss files:
- Specify an
includeoption which includes scss files (i.e. a glob or regexp) - Define a
transformfunction in the plugin options.
import litcss from 'web-dev-server-plugin-lit-css';
import Sass from 'sass';
export default {
plugins: [
litcss({
include: '/**/*.scss',
transform: (data, { filePath }) =>
Sass.renderSync({ data, file: filePath })
.css.toString(),
}),
]
}Similarly, to transform sources using PostCSS, specify a transform function:
import litcss from 'web-dev-server-plugin-lit-css';
import postcss from 'postcss';
import postcssNesting from 'postcss-nesting';
const processor = postcss(postcssNesting());
export default {
plugins: [
litcss({
include: '**/*.css',
transform: (css, { filePath }) =>
processor.process(css, { from: filePath })
.css,
}),
]
}Looking for rollup? rollup-plugin-lit-css Looking for esbuild? esbuild-plugin-lit-css Looking for webpack? lit-css-loader