Fix no ouptut on error & use lts/iron on build windows.

Author: T4rk1n

.circleci/config.yml

@@ -159,7 +159,7 @@ jobs:
             pip install --no-cache-dir --upgrade -e .[ci,dev] --progress-bar off
       - run:
            command: |
-             nvm install 18 && nvm use 18
+             nvm install lts/iron && nvm use lts/iron
       - run:
           name: npm prereqs
           command: |

dash/development/update_components.py

@@ -48,15 +48,12 @@ def bootstrap_components(components_source, concurrency, install_type):
     status_print(cmdstr)
 
     with subprocess.Popen(
-        cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=is_windows
+        cmd, shell=is_windows
     ) as proc:
-        out, err = proc.communicate()
-        status = proc.poll()
+        proc.wait()
+        status = proc.returncode
 
-    if err:
-        status_print(("🛑 " if status else "") + err.decode(), file=sys.stderr)
-
-    if status or not out:
+    if status:
         status_print(
             f"🚨 Failed installing npm dependencies for component packages: {source_glob} (status={status}) 🚨",
             file=sys.stderr,
@@ -84,15 +81,12 @@ def build_components(components_source, concurrency):
     status_print(cmdstr)
 
     with subprocess.Popen(
-        cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=is_windows
+        cmd, shell=is_windows
     ) as proc:
-        out, err = proc.communicate()
-        status = proc.poll()
-
-    if err:
-        status_print(("🛑 " if status else "") + err.decode(), file=sys.stderr)
+        proc.wait()
+        status = proc.returncode
 
-    if status or not out:
+    if status:
         status_print(
             f"🚨 Finished updating component packages: {source_glob} (status={status}) 🚨",
             file=sys.stderr,