Initial Commit

node_modules/web-vitals/dist/modules/lib/bindReporter.js

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+const getRating = (value, thresholds) => {
+    if (value > thresholds[1]) {
+        return 'poor';
+    }
+    if (value > thresholds[0]) {
+        return 'needs-improvement';
+    }
+    return 'good';
+};
+export const bindReporter = (callback, metric, thresholds, reportAllChanges) => {
+    let prevValue;
+    let delta;
+    return (forceReport) => {
+        if (metric.value >= 0) {
+            if (forceReport || reportAllChanges) {
+                delta = metric.value - (prevValue || 0);
+                // Report the metric if there's a non-zero delta or if no previous
+                // value exists (which can happen in the case of the document becoming
+                // hidden when the metric value is 0).
+                // See: https://github.com/GoogleChrome/web-vitals/issues/14
+                if (delta || prevValue === undefined) {
+                    prevValue = metric.value;
+                    metric.delta = delta;
+                    metric.rating = getRating(metric.value, thresholds);
+                    callback(metric);
+                }
+            }
+        }
+    };
+};