From 1da1bb5a0263cb2568bdf205face992d7c0ab001 Mon Sep 17 00:00:00 2001
From: Tomasz Czubocha <tomasz.czubocha@gmail.com>
Date: Tue, 20 Jan 2026 17:43:40 +0000
Subject: [PATCH] fix: enable polling in chokidar to prevent EMFILE errors on
 macOS (#13281)

---
 packages/engine/src/lib/devMode/index.js      |  3 +++
 .../serverless/lib/plugins/aws/dev/index.js   | 19 +++++++++++++------
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/packages/engine/src/lib/devMode/index.js b/packages/engine/src/lib/devMode/index.js
index 522ec5e62..de5190ce3 100644
--- a/packages/engine/src/lib/devMode/index.js
+++ b/packages/engine/src/lib/devMode/index.js
@@ -903,6 +903,9 @@ export class ServerlessEngineDevMode {
       },
       ignoreInitial: true,
       followSymlinks: false,
+      // usePolling is enabled because chokidar v4 removed fsevents support,
+      // causing "EMFILE: too many open files" errors on macOS with large projects
+      usePolling: true,
       // Add debounce to prevent rapid-fire events
       awaitWriteFinish: {
         stabilityThreshold: 300,
diff --git a/packages/serverless/lib/plugins/aws/dev/index.js b/packages/serverless/lib/plugins/aws/dev/index.js
index c2c2ac83f..7164312ad 100644
--- a/packages/serverless/lib/plugins/aws/dev/index.js
+++ b/packages/serverless/lib/plugins/aws/dev/index.js
@@ -105,10 +105,13 @@ class AwsDev {
     mainProgress.notice('Connecting')
 
     // TODO: This should be applied more selectively
+    // usePolling is enabled because chokidar v4 removed fsevents support,
+    // causing "EMFILE: too many open files" errors on macOS with large projects
     chokidar
       .watch(this.serverless.config.serviceDir, {
         ignored: /\.serverless/,
         ignoreInitial: true,
+        usePolling: true,
       })
       .on('all', async (event, path) => {
         await this.serverless.pluginManager.spawn('dev-build')
@@ -751,12 +754,16 @@ class AwsDev {
       this.serverless.configurationFilename,
     )
 
-    chokidar.watch(configFilePath).on('change', (event, path) => {
-      logger.warning(
-        `If you've made infrastructure changes, restart the dev command w/ "serverless dev"`,
-      )
-      logger.blankLine()
-    })
+    chokidar
+      .watch(configFilePath, {
+        usePolling: true,
+      })
+      .on('change', (event, path) => {
+        logger.warning(
+          `If you've made infrastructure changes, restart the dev command w/ "serverless dev"`,
+        )
+        logger.blankLine()
+      })
   }
 
   /**