/**
 * @since 1.0.0
 */
import type * as Option from "@effect/data/Option";
import type * as STM from "@effect/stm/STM";
/**
 * @since 1.0.0
 * @category symbols
 */
export declare const TRefTypeId: unique symbol;
/**
 * @since 1.0.0
 * @category symbols
 */
export type TRefTypeId = typeof TRefTypeId;
/**
 * A `TRef<A>` is a purely functional description of a mutable reference that can
 * be modified as part of a transactional effect. The fundamental operations of
 * a `TRef` are `set` and `get`. `set` transactionally sets the reference to a
 * new value. `get` gets the current value of the reference.
 *
 * NOTE: While `TRef<A>` provides the transactional equivalent of a mutable
 * reference, the value inside the `TRef` should be immutable.
 *
 * @since 1.0.0
 * @category models
 */
export interface TRef<A> extends TRef.Variance<A> {
    /**
     * Note: the method is unbound, exposed only for potential extensions.
     */
    modify<B>(f: (a: A) => readonly [B, A]): STM.STM<never, never, B>;
}
/**
 * @since 1.0.0
 */
export declare namespace TRef {
    /**
     * @since 1.0.0
     */
    interface Variance<A> {
        readonly [TRefTypeId]: {
            readonly _A: (_: never) => A;
        };
    }
}
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const get: <A>(self: TRef<A>) => STM.STM<never, never, A>;
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const getAndSet: {
    <A>(value: A): (self: TRef<A>) => STM.STM<never, never, A>;
    <A>(self: TRef<A>, value: A): STM.STM<never, never, A>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const getAndUpdate: {
    <A>(f: (a: A) => A): (self: TRef<A>) => STM.STM<never, never, A>;
    <A>(self: TRef<A>, f: (a: A) => A): STM.STM<never, never, A>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const getAndUpdateSome: {
    <A>(f: (a: A) => Option.Option<A>): (self: TRef<A>) => STM.STM<never, never, A>;
    <A>(self: TRef<A>, f: (a: A) => Option.Option<A>): STM.STM<never, never, A>;
};
/**
 * @since 1.0.0
 * @category constructors
 */
export declare const make: <A>(value: A) => STM.STM<never, never, TRef<A>>;
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const modify: {
    <A, B>(f: (a: A) => readonly [B, A]): (self: TRef<A>) => STM.STM<never, never, B>;
    <A, B>(self: TRef<A>, f: (a: A) => readonly [B, A]): STM.STM<never, never, B>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const modifySome: {
    <A, B>(fallback: B, f: (a: A) => Option.Option<readonly [B, A]>): (self: TRef<A>) => STM.STM<never, never, B>;
    <A, B>(self: TRef<A>, fallback: B, f: (a: A) => Option.Option<readonly [B, A]>): STM.STM<never, never, B>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const set: {
    <A>(value: A): (self: TRef<A>) => STM.STM<never, never, void>;
    <A>(self: TRef<A>, value: A): STM.STM<never, never, void>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const setAndGet: {
    <A>(value: A): (self: TRef<A>) => STM.STM<never, never, A>;
    <A>(self: TRef<A>, value: A): STM.STM<never, never, A>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const update: {
    <A>(f: (a: A) => A): (self: TRef<A>) => STM.STM<never, never, void>;
    <A>(self: TRef<A>, f: (a: A) => A): STM.STM<never, never, void>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const updateAndGet: {
    <A>(f: (a: A) => A): (self: TRef<A>) => STM.STM<never, never, A>;
    <A>(self: TRef<A>, f: (a: A) => A): STM.STM<never, never, A>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const updateSome: {
    <A>(f: (a: A) => Option.Option<A>): (self: TRef<A>) => STM.STM<never, never, void>;
    <A>(self: TRef<A>, f: (a: A) => Option.Option<A>): STM.STM<never, never, void>;
};
/**
 * @since 1.0.0
 * @category mutations
 */
export declare const updateSomeAndGet: {
    <A>(f: (a: A) => Option.Option<A>): (self: TRef<A>) => STM.STM<never, never, A>;
    <A>(self: TRef<A>, f: (a: A) => Option.Option<A>): STM.STM<never, never, A>;
};
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