text: import reduce from 'reduce-css-calc'
  import memoize from 'lodash.memoize'
  
  const reduceMemo = memoize(reduce)
  
  export default function install (less) {
    const { reduceCalc = true } = this.options || {}
  
    if (reduceCalc) {
      // Overriding `Call.prototype.genCSS`
      const { genCSS } = less.tree.Call.prototype
      less.tree.Call.prototype.genCSS = function (context, output) {
        if (this.calc) {
          const buffer = []
          const proxy = {
            add: (chunk) => buffer.push(chunk),
            isEmpty: () => buffer.length === 0
          }
          genCSS.call(this, context, proxy)
          output.add(reduceMemo(buffer.join('')))
          return
        }
  
        genCSS.call(this, context, output)
      }
    }
  }
  