import { FiberId } from "@effect/core/io/FiberId/definition";
import { Eval } from "@tsplus/stdlib/io/Eval/definition";
import type { None } from "@effect/core/io/FiberId/definition";
/**
 * Determines if the `FiberId` is a `None`.
 * @tsplus fluent effect/core/io/FiberId isNone
 * @tsplus location "@effect/core/io/FiberId/operations/isNone"
 */
export declare function isNone(self: FiberId): self is None;
//# sourceMappingURL=isNone.d.ts.map