/**
 * Low-level helpers for making custom values behave like Effects. The module
 * exposes a prototype builder, an abstract base class, and a mixin that let
 * domain-specific values, such as service keys or configuration descriptions,
 * be evaluated by Effect and yielded inside `Effect.gen`.
 *
 * @stability stable
 * @since 4.0.0
 */
import type * as Effect from "./Effect.ts";
import type * as Fiber from "./Fiber.ts";
/**
 * Create a low-level `Effect` prototype.
 *
 * **When to use**
 *
 * Use when you need to create a custom Effect-like value without extending a
 * class, by providing a label and an evaluate function that receives the
 * current fiber.
 *
 * **Details**
 *
 * When the effect is evaluated, it calls `evaluate` with the current fiber.
 *
 * @see {@link Class} for a class-based approach to defining custom Effect values
 * @see {@link Mixin} for wrapping an existing class constructor
 *
 * @stability stable
 * @category prototypes
 * @since 4.0.0
 */
export declare const Prototype: <A extends Effect.Effect<any, any, any>>(options: {
    readonly label: string;
    readonly evaluate: (this: A, fiber: Fiber.Fiber<any, any>) => Effect.Effect<Effect.Success<A>, Effect.Error<A>, Effect.Services<A>>;
}) => Effect.Effect<Effect.Success<A>, Effect.Error<A>, Effect.Services<A>>;
declare const Base: new <A, E, R>() => Effect.Effect<A, E, R>;
/**
 * Provides an abstract class that can be extended to create an `Effect`.
 *
 * **When to use**
 *
 * Use as an abstract base class to define custom classes whose instances behave
 * as `Effect` values.
 *
 * @see {@link Prototype} for a lower-level primitive approach to creating custom Effect-like values without a class
 * @see {@link Mixin} for wrapping an existing class constructor
 * @stability stable
 * @category constructors
 * @since 2.0.0
 */
export declare abstract class Class<A, E = never, R = never> extends Base<A, E, R> {
    abstract asEffect(): Effect.Effect<A, E, R>;
}
type AsEffectReturn<Self> = Self extends {
    asEffect(): infer A extends Effect.Effect<any, any, any>;
} ? A : never;
declare abstract class MixinBase extends Class<any, any, any> {
    constructor(...args: ReadonlyArray<any>);
    readonly [Effect.TypeId]: AsEffectReturn<this>[Effect.TypeId];
    [Symbol.iterator](): Effect.EffectIterator<AsEffectReturn<this>>;
}
/**
 * Returns a subclass of the provided class that inserts the Effect prototype
 * into the inheritance chain.
 *
 * **When to use**
 *
 * Use to make instances of an existing class behave as `Effect` values without
 * extending {@link Class} or modifying the original prototype.
 *
 * **Details**
 *
 * Pass the class to wrap, then implement `asEffect` on the final class. The
 * returned class is abstract, and the success, error, and service types are
 * inferred from the concrete `asEffect` return type. Concrete and abstract base
 * classes are supported. Constructor parameters and instance members are
 * preserved, except that Effect's prototype members shadow base prototype
 * members with the same name: `pipe`, `toString`, `toJSON`, `[Symbol.iterator]`,
 * and `[Symbol.for("nodejs.util.inspect.custom")]`.
 *
 * **Example** (Evaluating a mixed-in class)
 *
 * ```ts import.meta.vitest
 * import { Effect, Effectable } from "effect"
 *
 * class Box {
 *   constructor(readonly value: number) {}
 * }
 *
 * class EffectBox extends Effectable.Mixin(Box) {
 *   asEffect() {
 *     return Effect.succeed(this.value)
 *   }
 * }
 *
 * const box = new EffectBox(2)
 * Effect.isEffect(box) // => true
 * await Effect.runPromise(box) // => 2
 * ```
 *
 * @see {@link Prototype} for a lower-level primitive approach to creating custom Effect-like values without a class
 * @see {@link Class} for a base constructor to extend
 * @stability stable
 * @category constructors
 * @since 4.0.0
 */
export declare const Mixin: <TBase extends abstract new (...args: ReadonlyArray<any>) => object>(klass: TBase) => TBase & typeof MixinBase;
export {};
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