init

node_modules/@sentry-internal/tracing/esm/browser/web-vitals/getFID.js

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+import { bindReporter } from './lib/bindReporter.js';
+import { getVisibilityWatcher } from './lib/getVisibilityWatcher.js';
+import { initMetric } from './lib/initMetric.js';
+import { observe } from './lib/observe.js';
+import { onHidden } from './lib/onHidden.js';
+
+/*
+ * 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.
+ */
+
+/**
+ * Calculates the [FID](https://web.dev/fid/) value for the current page and
+ * calls the `callback` function once the value is ready, along with the
+ * relevant `first-input` performance entry used to determine the value. The
+ * reported value is a `DOMHighResTimeStamp`.
+ *
+ * _**Important:** since FID is only reported after the user interacts with the
+ * page, it's possible that it will not be reported for some page loads._
+ */
+const onFID = (onReport) => {
+  const visibilityWatcher = getVisibilityWatcher();
+  const metric = initMetric('FID');
+  // eslint-disable-next-line prefer-const
+  let report;
+
+  const handleEntry = (entry) => {
+    // Only report if the page wasn't hidden prior to the first input.
+    if (entry.startTime < visibilityWatcher.firstHiddenTime) {
+      metric.value = entry.processingStart - entry.startTime;
+      metric.entries.push(entry);
+      report(true);
+    }
+  };
+
+  const handleEntries = (entries) => {
+    (entries ).forEach(handleEntry);
+  };
+
+  const po = observe('first-input', handleEntries);
+  report = bindReporter(onReport, metric);
+
+  if (po) {
+    onHidden(() => {
+      handleEntries(po.takeRecords() );
+      po.disconnect();
+    }, true);
+  }
+};
+
+export { onFID };
+//# sourceMappingURL=getFID.js.map