declare namespace org {
    namespace spongepowered {
        namespace api {
            namespace data {
                namespace property {
                    namespace item {
                        // @ts-ignore
                         class EfficiencyProperty extends org.spongepowered.api.data.property.DoubleProperty {
                            /**
                             * Creates a new EfficiencyProperty property for the specified value.
                             */
                            constructor(value: number)
                            /**
                             * Creates a new EfficiencyProperty property for the specified value
                             * and operator.
                             */
                            constructor(value: number, operator: org.spongepowered.api.data.Property.Operator)
                            /**
                             * Creates a new EfficiencyProperty property for the specified value
                             * and operator.
                             */
                            constructor(value: any, operator: org.spongepowered.api.data.Property.Operator)
                        }
                    }
                }
            }
        }
    }
}
