Click 8.2.2 breaks auto-reloader-active on flask --debug #3024
Description
On upgrading click to version 8.2.2, flask --debug run no longer automatically enables the reloader. If I downgrade click to 8.2.1, it works again.
$ uv pip install flask
Using Python 3.13.2 environment at: venv
Resolved 7 packages in 2ms
Installed 7 packages in 3ms
+ blinker==1.9.0
+ click==8.2.2
+ flask==3.1.1
+ itsdangerous==2.2.0
+ jinja2==3.1.6
+ markupsafe==3.0.2
+ werkzeug==3.1.3
$ cat app.py
from flask import Flask
app = Flask(__name__)
if __name__ == '__main__':
app.run()
$ flask run --debug
* Debug mode: on
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
* Running on http://127.0.0.1:5000
Press CTRL+C to quit
^C
$ uv pip install click==8.2.1
Using Python 3.13.2 environment at: venv
Resolved 1 package in 1ms
Uninstalled 1 package in 0.65ms
Installed 1 package in 1ms
- click==8.2.2
+ click==8.2.1
$ flask run --debug
* Debug mode: on
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
* Running on http://127.0.0.1:5000
Press CTRL+C to quit
* Restarting with stat
* Debugger is active!
* Debugger PIN: 575-957-529
[From my trace, it looks like the issue affects the debugger as well, but I haven't been using or testing that.]
This appears to be connected to #2952, but I'm not sure if the issue is now in click or in how flask is using click.
The issue occurs because the --reload/--no-reload option is now defaulting to False when it is not specified on the command line, meaning the if reload is None: condition is not triggered to activate the reloader based on the debug flag.
Environment:
- Python version: 3.13.3
- Flask version: 3.1.1