import type { Exit } from "../Exit";
import type { Cause } from "../Exit/Cause";
import type { FiberStatus } from "./status";
export declare type FiberState<E, A> = FiberStateExecuting<E, A> | FiberStateDone<E, A>;
export declare type Callback<E, A> = (exit: Exit<E, A>) => void;
export declare class FiberStateExecuting<E, A> {
   readonly status: FiberStatus;
   readonly observers: Callback<never, Exit<E, A>>[];
   readonly interrupted: Cause<never>;
   readonly _tag = "Executing";
   constructor(status: FiberStatus, observers: Callback<never, Exit<E, A>>[], interrupted: Cause<never>);
}
export declare class FiberStateDone<E, A> {
   readonly value: Exit<E, A>;
   readonly _tag = "Done";
   readonly interrupted: Cause<never>;
   readonly status: FiberStatus;
   constructor(value: Exit<E, A>);
}
export declare const initial: <E, A>() => FiberState<E, A>;
export declare const interrupting: <E, A>(state: FiberState<E, A>) => boolean;
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