Currently, it is possible to run only one watching task.
But often it is required to run multiple background tasks to start the project (e.g. "npm run-script start-server" and "npm run-script start-client").
This is in the pipeline...
This got addressed by the new terminal runner. To make use of the new terminal runner please see: https://code.visualstudio.com/docs/editor/tasks#_convert-from-010-to-200
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This is in the pipeline...