packages/jss-plugin-expand/src/index.js
function mapValuesByProp(value: JssValue, prop: string, rule: StyleRule) {
  return value.map(item => objectToArray(item, prop, rule, false, true))
}
function mapValuesByProp(value: JssValue, prop: string, rule: StyleRule) {
  return value.map(item => objectToArray(item, prop, rule, false, true))
}
Map values by given prop.

@param {Array} array of values
@param {String} original property
@param {String} original rule
@return {String} mapped values