code: function normalizeRowColumn (str) {
    let normalized = parser(str)
      .nodes
      .reduce((result, node) => {
        if (node.type === 'function' && node.value === 'repeat') {
          let key = 'count'
  
          let [count, value] = node.nodes.reduce((acc, n) => {
            if (n.type === 'word' && key === 'count') {
              acc[0] = Math.abs(parseInt(n.value))
              return acc
            }
            if (n.type === 'div' && n.value === ',') {
              key = 'value'
              return acc
            }
            if (key === 'value') {
              acc[1] += parser.stringify(n)
            }
            return acc
          }, [0, ''])
  
          if (count) {
            for (let i = 0; i < count; i++) {
              result.push(value)
            }
          }
  
          return result
        }
        if (node.type === 'space') {
          return result
        }
        return result.concat(parser.stringify(node))
      }, [])
  
    return normalized
  }
docs: normalize the grid-template-rows/columns values
  @param  {String} str grid-template-rows/columns value
  @return {Array} normalized array with values
  @example
  let normalized = normalizeRowColumn('1fr repeat(2, 20px 50px) 1fr')
  normalized // <= ['1fr', '20px', '50px', '20px', '50px', '1fr']