Usage

import {withStyles} from 'lit-with-styles';

@customElement('my-element')
@withStyles(elementStyles)
class MyElement extends LitElement {
}

The decorator will create a stylesheet in the background and inject it into the element (It's optimized in a way elements sharing same styles will share the same stylesheet.)

You can also pass an array of styles into the decorator. Here's all the accepted types:

import {css} from 'lit';
import elementsStyles from './element-styles.css' assert { type: 'css' };

@withStyles([
	// [1]
	':host { background-color: red }',
	// [2]
	css`:host { color: white }`,
	// [3]
	elementStyles
])

[1] string version
[2] css tagged literal version
[3] css module version
(You can also pass a CSSStyleSheet object)

Base styles

Sometimes you need to define global styles to share accross all your elements. lit-with-styles provides a method for that.

import {setBaseStyles} from 'lit-with-styles';

setBaseStyles(css`...`)
// or
// setBaseStyles('...')

(note: If the base styles are not applied to some of your elements then you should try to call that function earlier in your code.)

Now when you use @withStyles base styles are automatically applied. The second argument of the decorator let you redefined the base styles per element if needed:

@withStyles(elementStyles, newBaseStyles)

Bare version (for minimalistic addicts)

Sometimes you just want to use @withStyles to inject base styles to your element, and do no need to pass any arguments:

import {withStyles} from 'lit-with-styles/bare';

@customElement('my-element') @withStyles
class MyElement extends LitElement {}

(You will need to set moduleResolution to nodenext in your TS configuration file for that.)

Installation

npm add -D lit-with-styles

License

MIT (c) 2023 Valentin Degenne