shorter ssr bench output

Author: yyx990803

benchmarks/ssr/renderToStream.js

@@ -1,3 +1,5 @@
+/* eslint-disable no-unused-vars */
+
 'use strict'
 
 const Vue = require('../../dist/vue.runtime.common.js')
@@ -7,20 +9,21 @@ const gridComponent = require('./common.js')
 
 console.log('--- renderToStream --- ')
 const self = (global || root)
-self.s = self.performance.now()
+const s = self.performance.now()
 
 const stream = renderToStream(new Vue(gridComponent))
 let str = ''
-const stats = []
+let first
+let complete
+stream.once('data', () => {
+  first = self.performance.now() - s
+})
 stream.on('data', chunk => {
   str += chunk
-  stats.push(self.performance.now())
 })
 stream.on('end', () => {
-  stats.push(self.performance.now())
-  stats.forEach((val, index) => {
-    const type = index !== stats.length - 1 ? 'Chunk' : 'Complete'
-    console.log(type + ' time: ' + (val - self.s).toFixed(2) + 'ms')
-  })
+  complete = self.performance.now() - s
+  console.log(`first chunk: ${first.toFixed(2)}ms`)
+  console.log(`complete: ${complete.toFixed(2)}ms`)
   console.log()
 })