open-consul/ui/packages/consul-ui/app/modifiers/attach-shadow.js

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import { setModifierManager, capabilities } from '@ember/modifier';
export default setModifierManager(
() => ({
capabilities: capabilities('3.13', { disableAutoTracking: true }),
createModifier() {},
installModifier(_state, element, { positional: [fn, ...args], named }) {
let shadow;
try {
shadow = element.attachShadow({ mode: 'open' });
} catch (e) {
// shadow = false;
console.error(e);
}
fn(shadow);
},
updateModifier() {},
destroyModifier() {},
}),
class CustomElementModifier {}
);