Effectable

Low-level helpers for making custom values behave like Effects. The module exposes a prototype builder and an abstract base class that let domain-specific values, such as service keys or configuration descriptions, be evaluated by Effect and yielded inside Effect.gen.

2 exports Added in v2.0.0 Source

Constructors

Class

Added in v2.0.0 Source

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

Prototype for a lower-level primitive approach to creating custom Effect-like values without a class

Signature

declare class Class<A, E = never, R = never> extends Base<A, E, R> {
  constructor<A, E = never, R = never>();
  abstract override: Effect<A, E, R>;
}

Prototypes

Prototype

Added in v4.0.0 Source

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

Class for a class-based approach to defining custom Effect values

Signature

declare function Prototype<A extends Effect<any, any, any>>(options: {
  readonly evaluate: (this: A, fiber: Fiber<any, any>) => Effect<Success<A>, Error<A>, Services<A>>;
  readonly label: string;
}): Effect<Success<A>, Error<A>, Services<A>>;