text: export function objectWithKey (key, value) {
    return ((Array.isArray(value) && value.length > 0) || (!Array.isArray(value) && value)) ? {[key]: value} : {}
  }
  
  export function classList (props) {
    let classes = {
      'fa-spin': props.spin,
      'fa-pulse': props.pulse,
      'fa-fw': props.fixedWidth,
      'fa-border': props.border,
      'fa-li': props.listItem,
      'fa-inverse': props.inverse,
      'fa-flip-horizontal': props.flip === 'horizontal' || props.flip === 'both',
      'fa-flip-vertical': props.flip === 'vertical' || props.flip === 'both',
      [`fa-${props.size}`]: props.size !== null,
      [`fa-rotate-${props.rotation}`]: props.rotation !== null,
      [`fa-pull-${props.pull}`]: props.pull !== null,
      'fa-swap-opacity': props.swapOpacity
    }
  
    return Object.keys(classes)
      .map(key => classes[key] ? key : null)
      .filter(key => key)
  }
  
  export function addStaticClass(to, what) {
    const val = (to || '').length === 0 ? [] : [to]
  
    return val.concat(what).join(' ')
  }
  