Use concat instead of push around listFolders

This avoids stack overflows when using the spread operator on
directories that have many, many children.

Author: aeisenberg

lib/analyze-action.js

@@ -151,17 +151,19 @@ async function run() {
 
     if (config.debugMode) {
       // Upload the logs as an Actions artifact for debugging
-      const toUpload: string[] = [];
+      let toUpload: string[] = [];
       for (const language of config.languages) {
-        toUpload.push(
-          ...listFolder(
+        toUpload = toUpload.concat(
+          listFolder(
             path.resolve(util.getCodeQLDatabasePath(config, language), "log")
           )
         );
       }
       if (await codeQlVersionAbove(codeql, CODEQL_VERSION_NEW_TRACING)) {
         // Multilanguage tracing: there are additional logs in the root of the cluster
-        toUpload.push(...listFolder(path.resolve(config.dbLocation, "log")));
+        toUpload = toUpload.concat(
+          listFolder(path.resolve(config.dbLocation, "log"))
+        );
       }
       await uploadDebugArtifacts(
         toUpload,
@@ -319,12 +321,12 @@ async function uploadDebugArtifacts(
 
 function listFolder(dir: string): string[] {
   const entries = fs.readdirSync(dir, { withFileTypes: true });
-  const files: string[] = [];
+  let files: string[] = [];
   for (const entry of entries) {
     if (entry.isFile()) {
       files.push(path.resolve(dir, entry.name));
     } else if (entry.isDirectory()) {
-      files.push(...listFolder(path.resolve(dir, entry.name)));
+      files = files.concat(listFolder(path.resolve(dir, entry.name)));
     }
   }
   return files;