import { TSet } from "@effect/core/stm/TSet/definition";
import { USTM } from "@effect/core/stm/STM/definition/base";
/**
 * Returns the set's cardinality.
 * @tsplus getter ets/TSet size
 * @tsplus location "@effect/core/stm/TSet/operations/size"
 */
export declare function size<A>(self: TSet<A>): USTM<number>;
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