fix: avoid call stack overflow while processing globs (#19035)

* fix: avoid call stack overflow by processing file paths in chunks

* use `flatMap()`

* add comments

lib/eslint/eslint-helpers.js

@@ -421,20 +421,19 @@ async function globMultiSearch({ searches, configLoader, errorOnUnmatchedPattern
         )
     );
 
-    const filePaths = [];
-
+    /*
+     * The first loop handles errors from the glob searches. Since we can't
+     * use `await` inside `flatMap`, we process errors separately in this loop.
+     * This results in two iterations over `results`, but since the length is
+     * less than or equal to the number of globs and directories passed on the
+     * command line, the performance impact should be minimal.
+     */
     for (let i = 0; i < results.length; i++) {
 
         const result = results[i];
         const currentSearch = normalizedSearches[i];
 
         if (result.status === "fulfilled") {
-
-            // if the search was successful just add the results
-            if (result.value.length > 0) {
-                filePaths.push(...result.value);
-            }
-
             continue;
         }
 
@@ -457,7 +456,8 @@ async function globMultiSearch({ searches, configLoader, errorOnUnmatchedPattern
 
     }
 
-    return filePaths;
+    // second loop for `fulfulled` results
+    return results.flatMap(result => result.value);
 
 }