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[Refactor] Use rxjs first instead of unsubscribe from queryParams #516
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Objective
As discussed in #470, we currently call
unsubscribe()on the queryParams object from within its callback. This is a bit of an anti-pattern and can throw an error about the subscription variable being undefined.Code changes
Use the rxjs
firstoperator instead. This will automatically unsubscribe from the observable after the first value is emitted. We should use this pattern from now on.