consul/ui/packages/consul-ui/app/helpers/adopt-styles.js

27 lines
728 B
JavaScript

/**
* Copyright (c) HashiCorp, Inc.
* SPDX-License-Identifier: MPL-2.0
*/
import Helper from '@ember/component/helper';
import { assert } from '@ember/debug';
import { adoptStyles } from '@lit/reactive-element';
export default class AdoptStylesHelper extends Helper {
/**
* Adopt/apply given styles to a `ShadowRoot` using constructable styleSheets if supported
*
* @param {[ShadowRoot, (CSSResultGroup | CSSResultGroup[])]} params
*/
compute([$shadow, styles], hash) {
assert(
'adopt-styles can only be used to apply styles to ShadowDOM elements',
$shadow instanceof ShadowRoot
);
if (!Array.isArray(styles)) {
styles = [styles];
}
adoptStyles($shadow, styles);
}
}