Set description of next registered task.

Execute task action functions. First the non-async actions are executed synchronously then the async actions are exectuted asynchronously. Silently skip tasks that have no action function.

Execute named tasks along with their prerequisite tasks (direct and indirect). If no task names are specified then the command-line tasks are run. If no command-line tasks were specified the default task (set in env("--default-task")) is run.

Create and register a task. Returns the task object.