I have voted too.
I have the Script Runner plugin, but I have it for Cloud.
The example linked here: https://jamieechlin.atlassian.net/wiki/spaces/GRV/pages/33030170/Post+Functions#PostFunctions-Autocloseallsubtasks is for Jira Server instead.
Do you know where I could find similar information for Jira Cloud?
There's now a very easy to configure way to transition parents and sub-tasks in sync using Automation for JIRA!
(this example transitions sub-tasks to "In Progress", but you could easily change this to "Closed" as well)
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