import CSS files as tagged template literals

Usage no npm install needed!

<script type="module">
  import esbuildPluginLitCss from '';



ESBuild 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.

Do I Need This?

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
filter RegExp of file names to apply to /\.css$/i
uglify Boolean or Object of uglifycss options. false
specifier Package to import css from lit
tag Name of the template-tag function css


import config from './'
import litcss from 'esbuild-plugin-lit-css';

export default {
  plugins: [
    litcss({ include, exclude, uglify })

Then import your CSS:

:host {
  display: block;

h1 {
  color: hotpink;
import { LitElement, customElement, html } from 'lit-element';

import style from './css-in-css.css';

class CSSInCSS extends LitElement {
  static get styles() {
    return [style];

  render() {
    return html`<h1>It's Lit!</h1>`;

Usage with FAST

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 {}

Looking for webpack? lit-css-loader Looking for rollup? rollup-plugin-lit-css