fix: don't report failed network requests as JavaScript errors (#38732)

On the issue ref popup, when the user clicks the link while fetch is
loading, the page will briefly render a network error message before
loading the next page. Suppress unnecessary network errors.

package.json

@@ -49,6 +49,7 @@
     "easymde": "2.21.0",
     "esbuild": "0.28.1",
     "idiomorph": "0.7.4",
+    "is-network-error": "1.3.2",
     "jquery": "4.0.0",
     "js-yaml": "5.2.2",
     "katex": "0.18.1",

pnpm-lock.yaml

@@ -137,6 +137,9 @@ importers:
       idiomorph:
         specifier: 0.7.4
         version: 0.7.4
+      is-network-error:
+        specifier: 1.3.2
+        version: 1.3.2
       jquery:
         specifier: 4.0.0
         version: 4.0.0
@@ -2923,6 +2926,10 @@ packages:
     resolution: {integrity: sha512-5KoIu2Ngpyek75jXodFvnafB6DJgr3u8uuK0LEZJjrU19DrMD3EVERaR8sjz8CCGgpZvxPl9SuE1GMVPFHx1mw==}
     engines: {node: '>= 0.4'}
 
+  is-network-error@1.3.2:
+    resolution: {integrity: sha512-PhBY86zaxNZUuWP6h13Vu5oFe0XY6/UlKzQnYFELzGVHygP3MxmvTfYSG7GN3aIab/iWudSMgjSnG9Dq+nHrgA==}
+    engines: {node: '>=16'}
+
   is-number-object@1.1.1:
     resolution: {integrity: sha512-lZhclumE1G6VYD8VHe35wFaIif+CTy5SJIi5+3y4psDgWu4wPDoBhF8NxUOinEc7pHgiTsT6MaBb92rKhhD+Xw==}
     engines: {node: '>= 0.4'}
@@ -7391,6 +7398,8 @@ snapshots:
   is-negative-zero@2.0.3:
     optional: true
 
+  is-network-error@1.3.2: {}
+
   is-number-object@1.1.1:
     dependencies:
       call-bound: 1.0.4

web_src/js/modules/errors.ts

@@ -1,5 +1,6 @@
 // keep this file lightweight, it's imported into IIFE chunk in bootstrap
 import {html} from '../utils/html.ts';
+import isNetworkError from 'is-network-error';
 import type {Intent} from '../types.ts';
 
 /** Extract a message string from an unknown caught value. */
@@ -66,6 +67,10 @@ export function processWindowErrorEvent({error, reason, message, type, filename,
     if (window.config.runModeIsProd) return;
   }
 
+  // Don't show network errors, happens on ref-issue when clicking on the
+  // issue link while the fetch request is still running.
+  if (isNetworkError(err)) return;
+
   // Filter out errors from browser extensions or other non-Gitea scripts.
   if (!isGiteaError(filename ?? '', err?.stack ?? '')) return;