From 26105034da4fcce7ac883c899d781f016559310d Mon Sep 17 00:00:00 2001
From: ruki <waruqi@gmail.com>
Date: Thu, 8 Nov 2018 00:38:48 +0800
Subject: switch to vuepress

---
 node_modules/vue/src/core/util/perf.js | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 node_modules/vue/src/core/util/perf.js

(limited to 'node_modules/vue/src/core/util/perf.js')

diff --git a/node_modules/vue/src/core/util/perf.js b/node_modules/vue/src/core/util/perf.js
new file mode 100644
index 00000000..4a537b2d
--- /dev/null
+++ b/node_modules/vue/src/core/util/perf.js
@@ -0,0 +1,24 @@
+import { inBrowser } from './env'
+
+export let mark
+export let measure
+
+if (process.env.NODE_ENV !== 'production') {
+  const perf = inBrowser && window.performance
+  /* istanbul ignore if */
+  if (
+    perf &&
+    perf.mark &&
+    perf.measure &&
+    perf.clearMarks &&
+    perf.clearMeasures
+  ) {
+    mark = tag => perf.mark(tag)
+    measure = (name, startTag, endTag) => {
+      perf.measure(name, startTag, endTag)
+      perf.clearMarks(startTag)
+      perf.clearMarks(endTag)
+      perf.clearMeasures(name)
+    }
+  }
+}
-- 
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