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Index expressions must result in a value whose type is an array, in a value whose type has a set of overloaded default properties, or in a set of overloaded properties. An interface can have only one default method or property. This means that it can either inherit an interface containing a default method or property, or its definition block can contain one method or property that is marked as default.
Error ID: BC30547
To correct this error
- Supply a default property in the interface.