1 files changed, 48 insertions, 0 deletions
diff --git a/node_modules/nanotiming/browser.js b/node_modules/nanotiming/browser.js
new file mode 100644
index 00000000..c630995d
--- /dev/null
+++ b/node_modules/nanotiming/browser.js
@@ -0,0 +1,48 @@
+var scheduler = require('nanoscheduler')()
+var assert = require('assert')
+
+var perf
+nanotiming.disabled = true
+try {
+  perf = window.performance
+  nanotiming.disabled = window.localStorage.DISABLE_NANOTIMING === 'true' || !perf.mark
+} catch (e) { }
+
+module.exports = nanotiming
+
+function nanotiming (name) {
+  assert.equal(typeof name, 'string', 'nanotiming: name should be type string')
+
+  if (nanotiming.disabled) return noop
+
+  var uuid = (perf.now() * 10000).toFixed() % Number.MAX_SAFE_INTEGER
+  var startName = 'start-' + uuid + '-' + name
+  perf.mark(startName)
+
+  function end (cb) {
+    var endName = 'end-' + uuid + '-' + name
+    perf.mark(endName)
+
+    scheduler.push(function () {
+      var err = null
+      try {
+        var measureName = name + ' [' + uuid + ']'
+        perf.measure(measureName, startName, endName)
+        perf.clearMarks(startName)
+        perf.clearMarks(endName)
+      } catch (e) { err = e }
+      if (cb) cb(err, name)
+    })
+  }
+
+  end.uuid = uuid
+  return end
+}
+
+function noop (cb) {
+  if (cb) {
+    scheduler.push(function () {
+      cb(new Error('nanotiming: performance API unavailable'))
+    })
+  }
+}