Effect CommunityEC
Effect Community•14mo ago
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Providing a middleware to another middleware in the Effect Typescript library involves ensuring t...

Is it possible to provide a middleware to another middleware?

I have an issue where I can not satisfy the requirements of a middleware from another that generates it:

// Requirement Middleware
export class CorrelationId extends Effect.Tag("CorrelationId")<CorrelationId, string>() {}

export class CorrelatorMiddleware extends HttpApiMiddleware.Tag<CorrelatorMiddleware>()("Correlator", {
    provides: CorrelationId
}) {}
export const CorrelatorMiddlewareLive = Layer.succeed(CorrelatorMiddleware, Effect.succeed(crypto.randomUUID()))

// Target Middleware
export class Authentication extends HttpApiMiddleware.Tag<Authentication>()(
    "Authentication",
    {
        provides: CurrentProvider,

export const AuthenticationLive: Layer.Layer<Authentication, never, CorrelationId> = Layer.effect(
    Authentication,
    Effect.gen(function*() {
        const providerRepo = yield* ProviderRepo
        const correlationId = yield* CorrelationId
        {...
        }
    })
).pipe(Layer.provide([ProviderRepo.Default]))

// HTTP Layers
export const HttpCoreLive = HttpApiBuilder.group(Api, "core", (handlers) =>
    Effect.gen(function*() {
        const correlationId = yield* CorrelationId
        return handlers
        {....}
    }))

const ApiLive = HttpApiBuilder.api(Api).pipe(Layer.provide(HttpCoreLive), Layer.provide(CorrelatorMiddlewareLive))

export const HttpLive = HttpApiBuilder.serve(HttpMiddleware.logger).pipe(
    Layer.provide(HttpApiSwagger.layer()),
    Layer.provide(HttpApiBuilder.middlewareOpenApi()),
    Layer.provide(HttpApiBuilder.middlewareCors()),
    Layer.provide(ApiLive),
    HttpServer.withLogAddress,
    Layer.provide(NodeHttpServer.layer(createServer, { port: 8080 }))
)


HttpLive.pipe(Layer.launch,
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