open-consul/ui/packages/consul-ui/app/helpers/class-map.js

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import { helper } from '@ember/component/helper';
/**
* Conditionally maps classInfos (classes) to a string ready for typical DOM
* usage (i.e. space delimited)
*
* @typedef {([string, boolean] | [string])} classInfo
* @param {(classInfo | string)[]} entries - An array of 'entry-like' arrays of `classInfo`s to map
*/
const classMap = entries => {
const str = entries
.filter(Boolean)
.filter(entry => (typeof entry === 'string' ? true : entry[entry.length - 1]))
.map(entry => (typeof entry === 'string' ? entry : entry[0]))
.join(' ');
return str.length > 0 ? str : undefined;
};
export default helper(classMap);