Fix concurrently error handling

Author: zxl629

scripts/webpack-test.js

@@ -155,8 +155,22 @@ const startSampleAndRun = async () => {
 		})
 		.catch((exitInfos) => {
 			// Concurrently throws SIGTERM with exit code 0 on success, check code and exit with it
-            const { exitCode } = exitInfos[0];
-			process.exit(exitCode);
+            if (Array.isArray(exitInfos)) {
+                // If it's an array of exit infos
+                const exitInfo = exitInfos[0];
+                if (exitInfo?.signal === 'SIGTERM') {
+                    process.exit(0);
+                }
+                const exitCode = exitInfo?.exitCode ?? 1;
+                process.exit(exitCode);
+            } else {
+                // If it's a single error object
+                if (exitInfos?.signal === 'SIGTERM') {
+                    process.exit(0);
+                }
+                const exitCode = exitInfos?.exitCode ?? 1;
+                process.exit(exitCode);
+            }
 		});
 };