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progress and cancel on background callbacks show type errors #3160
Description
Describe your context
Please provide us your environment, so we can easily reproduce the issue.
dash 3.0.0rc1
Describe the bug
progress and cancel on background callbacks show type errors in Dash 3.0.0rc1
cancel shows an error when passing a single component
progress shows an error when passing a list of outputs:
Activity
[-][BUG] - `progress` and `cancel` on background callbacks show type errors[/-][+]`progress` and `cancel` on background callbacks show type errors[/+]