Commands like flutter pub deps --json are meant to be machine parsed, however if the storage base url override is provided, the tool prints a warning to stdout, breaking JSON parsing.

For example: https://logs.chromium.org/logs/flutter/led/godofredoc_google.com/9b0e7965c41ffbd88f3da6015d6a92fd0296fc564d5fc09472f984f2c620e060/+/u/Analyze/analyze/test_stderr