From 8eff962cab608341a6f2fedc640a0e32d96f26e2 Mon Sep 17 00:00:00 2001
From: altaf-creator <dev@altafcreator.com>
Date: Sun, 9 Nov 2025 11:15:19 +0800
Subject: pain

---
 .../node_modules/web-vitals/dist/modules/onCLS.js  | 108 +++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 frontend-old/node_modules/web-vitals/dist/modules/onCLS.js

(limited to 'frontend-old/node_modules/web-vitals/dist/modules/onCLS.js')

diff --git a/frontend-old/node_modules/web-vitals/dist/modules/onCLS.js b/frontend-old/node_modules/web-vitals/dist/modules/onCLS.js
new file mode 100644
index 0000000..7c75a10
--- /dev/null
+++ b/frontend-old/node_modules/web-vitals/dist/modules/onCLS.js
@@ -0,0 +1,108 @@
+/*
+ * 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.
+ */
+import { onBFCacheRestore } from './lib/bfcache.js';
+import { initMetric } from './lib/initMetric.js';
+import { observe } from './lib/observe.js';
+import { bindReporter } from './lib/bindReporter.js';
+import { doubleRAF } from './lib/doubleRAF.js';
+import { onHidden } from './lib/onHidden.js';
+import { runOnce } from './lib/runOnce.js';
+import { onFCP } from './onFCP.js';
+/** Thresholds for CLS. See https://web.dev/articles/cls#what_is_a_good_cls_score */
+export const CLSThresholds = [0.1, 0.25];
+/**
+ * Calculates the [CLS](https://web.dev/articles/cls) value for the current page and
+ * calls the `callback` function once the value is ready to be reported, along
+ * with all `layout-shift` performance entries that were used in the metric
+ * value calculation. The reported value is a `double` (corresponding to a
+ * [layout shift score](https://web.dev/articles/cls#layout_shift_score)).
+ *
+ * If the `reportAllChanges` configuration option is set to `true`, the
+ * `callback` function will be called as soon as the value is initially
+ * determined as well as any time the value changes throughout the page
+ * lifespan.
+ *
+ * _**Important:** CLS should be continually monitored for changes throughout
+ * the entire lifespan of a page—including if the user returns to the page after
+ * it's been hidden/backgrounded. However, since browsers often [will not fire
+ * additional callbacks once the user has backgrounded a
+ * page](https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden),
+ * `callback` is always called when the page's visibility state changes to
+ * hidden. As a result, the `callback` function might be called multiple times
+ * during the same page load._
+ */
+export const onCLS = (onReport, opts) => {
+    // Set defaults
+    opts = opts || {};
+    // Start monitoring FCP so we can only report CLS if FCP is also reported.
+    // Note: this is done to match the current behavior of CrUX.
+    onFCP(runOnce(() => {
+        let metric = initMetric('CLS', 0);
+        let report;
+        let sessionValue = 0;
+        let sessionEntries = [];
+        const handleEntries = (entries) => {
+            entries.forEach((entry) => {
+                // Only count layout shifts without recent user input.
+                if (!entry.hadRecentInput) {
+                    const firstSessionEntry = sessionEntries[0];
+                    const lastSessionEntry = sessionEntries[sessionEntries.length - 1];
+                    // If the entry occurred less than 1 second after the previous entry
+                    // and less than 5 seconds after the first entry in the session,
+                    // include the entry in the current session. Otherwise, start a new
+                    // session.
+                    if (sessionValue &&
+                        entry.startTime - lastSessionEntry.startTime < 1000 &&
+                        entry.startTime - firstSessionEntry.startTime < 5000) {
+                        sessionValue += entry.value;
+                        sessionEntries.push(entry);
+                    }
+                    else {
+                        sessionValue = entry.value;
+                        sessionEntries = [entry];
+                    }
+                }
+            });
+            // If the current session value is larger than the current CLS value,
+            // update CLS and the entries contributing to it.
+            if (sessionValue > metric.value) {
+                metric.value = sessionValue;
+                metric.entries = sessionEntries;
+                report();
+            }
+        };
+        const po = observe('layout-shift', handleEntries);
+        if (po) {
+            report = bindReporter(onReport, metric, CLSThresholds, opts.reportAllChanges);
+            onHidden(() => {
+                handleEntries(po.takeRecords());
+                report(true);
+            });
+            // Only report after a bfcache restore if the `PerformanceObserver`
+            // successfully registered.
+            onBFCacheRestore(() => {
+                sessionValue = 0;
+                metric = initMetric('CLS', 0);
+                report = bindReporter(onReport, metric, CLSThresholds, opts.reportAllChanges);
+                doubleRAF(() => report());
+            });
+            // Queue a task to report (if nothing else triggers a report first).
+            // This allows CLS to be reported as soon as FCP fires when
+            // `reportAllChanges` is true.
+            setTimeout(report, 0);
+        }
+    }));
+};
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