feat: use async where possible · mmz-srf/webio@ac32ac8

Non-nullable property 'FieldName' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Path' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'FieldName' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Path' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

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