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Interface '<interfacename>' cannot be indexed because it has no default property

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.

See also