1 files changed, 24 insertions, 0 deletions
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)
+    }
+  }
+}