// ---------------------------------------------------------------------------// Plugin-contributed HttpApi composition.//// The host iterates plugins, calls each plugin's `routes()` to get its// `HttpApiGroup`, and reduces them into a single `HttpApi` for the runtime.// Each plugin's `handlers()` returns a late-binding Layer keyed by the// plugin's group identity, with the plugin's `extensionService` Tag left// as a Layer requirement. The host satisfies that Tag — at boot for// local (`composePluginHandlers(plugins, executor)`), per-request for// cloud (`providePluginExtensions(plugins)(executor)` in the auth// middleware).//// Static typing is intentionally loose here: the host composes a// runtime-arbitrary set of plugin groups, so `FullApi` can't be tracked// at compile time. Per-endpoint typing lives inside each plugin (its// own bundled `HttpApi.make(id).add(group)` and its// `createPluginAtomClient` frontend client). The host only needs the// runtime composition.// --------------------------------------------------------------------------- import { Effect, Layer } from "effect";import type { Context } from "effect";import type { HttpApi, HttpApiGroup } from "effect/unstable/httpapi";import type { AnyPlugin, PluginExtensions } from "@executor-js/sdk"; import { CoreExecutorApi } from "./api"; // ---------------------------------------------------------------------------// Type helpers// --------------------------------------------------------------------------- /** Extract the Service-tag identifier (the class itself) from a plugin's *  `extensionService` field — used to populate the `provides` clause of *  `HttpRouter.middleware<{ provides: ... }>()` from the plugin tuple *  without enumerating each Tag by hand at the host. * *  Helper type indirection (`ExtractServiceId`) forces distribution over *  the union of plugin tags — TS only distributes conditionals when the *  LHS is a naked type parameter, not a derived type expression. */// eslint-disable-next-line @typescript-eslint/no-explicit-anytype ExtractServiceId<S> = S extends Context.Service<infer Id, any> ? Id : never; export type PluginExtensionServices<TPlugins extends readonly AnyPlugin[]> = ExtractServiceId<  NonNullable<TPlugins[number]["extensionService"]>>; /** Extract the precise `HttpApiGroup` type carried by a plugin's *  `routes()` field. Plugins without a `routes()` field contribute *  nothing to the union (filtered out by `Extract<..., HttpApiGroup.Any>`). */type ExtractPluginGroup<P> = P extends { readonly routes?: () => infer G }  ? Extract<G, HttpApiGroup.Any>  : never; /** Union of every plugin's contributed group — combined with the core *  executor groups to type `composePluginApi(plugins)` precisely. */export type PluginGroups<TPlugins extends readonly AnyPlugin[]> = ExtractPluginGroup<  TPlugins[number]>; /** Group identities baked into `CoreExecutorApi` (tools, integrations, secrets, *  …). Extracted via inference so adding a core group flows through *  without touching this helper. */type CoreGroups =  // eslint-disable-next-line @typescript-eslint/no-explicit-any  typeof CoreExecutorApi extends HttpApi.HttpApi<any, infer G> ? G : never; /** Result of `composePluginApi(plugins)` — the core API extended with *  every plugin group from `TPlugins`. */export type ComposedExecutorApi<TPlugins extends readonly AnyPlugin[]> = HttpApi.HttpApi<  "executor",  CoreGroups | PluginGroups<TPlugins>>; // eslint-disable-next-line @typescript-eslint/no-explicit-anytype AnyLayer = Layer.Layer<any, any, any>; // Use the field accessor + NonNullable rather than `extends { handlers: ... }`// because the spec marks `handlers` optional (`handlers?:`); the conditional// form would fail the match because the field type includes `undefined`.type ExtractHandlerLayer<P> =  NonNullable<P extends { readonly handlers?: infer F } ? F : never> extends () => infer L    ? L    : never; // Compute the union of every plugin's handler-Layer type. Each plugin's// `handlers()` returns a specific `Layer<Group, never, ExtensionService>`;// we union them so `Layer.mergeAll(...)`'s output type can be extracted// without erasing per-plugin requirements.type PluginHandlerLayers<TPlugins extends readonly AnyPlugin[]> = ExtractHandlerLayer<  TPlugins[number]>; // Distribute over the union of handler layers to extract each channel// individually, then re-pack into a single `Layer<UnionROut, UnionE,// UnionRIn>` matching what `Layer.mergeAll` produces at runtime. Naive// `Union extends Layer<infer A, ...>` would distribute and yield a// union of layers, not a merged layer — these helpers fold instead.// eslint-disable-next-line @typescript-eslint/no-explicit-anytype LayerROut<L> = L extends Layer.Layer<infer ROut, any, any> ? ROut : never;// eslint-disable-next-line @typescript-eslint/no-explicit-anytype LayerE<L> = L extends Layer.Layer<any, infer E, any> ? E : never;// eslint-disable-next-line @typescript-eslint/no-explicit-anytype LayerRIn<L> = L extends Layer.Layer<any, any, infer RIn> ? RIn : never; type MergedHandlerLayer<TPlugins extends readonly AnyPlugin[]> = Layer.Layer<  LayerROut<PluginHandlerLayers<TPlugins>>,  LayerE<PluginHandlerLayers<TPlugins>>,  LayerRIn<PluginHandlerLayers<TPlugins>>>; /** * Compose plugin-contributed `HttpApiGroup`s into the core executor API. * Plugins without a `routes()` field are skipped. * * Returns a precisely typed `HttpApi<"executor", CoreGroups | * PluginGroups<TPlugins>>`. Hosts that need `HttpApiClient.ForApi<typeof * ProtectedCloudApi>` get exact endpoint types without per-plugin * `import type { …Group }` statements at the host. */export const composePluginApi = <TPlugins extends readonly AnyPlugin[]>(  plugins: TPlugins,): ComposedExecutorApi<TPlugins> => {  // eslint-disable-next-line @typescript-eslint/no-explicit-any  let api: any = CoreExecutorApi;  for (const plugin of plugins) {    if (plugin.routes) {      const group = plugin.routes();      api = api.add(group);    }  }  return api as ComposedExecutorApi<TPlugins>;}; /** * Build the merged Layer of plugin handler implementations, satisfying * each plugin's `extensionService` Tag eagerly from `executor[id]`. * * Suitable for hosts (like local) that have a single, boot-time * executor. Hosts with per-request executors (cloud) should use * `composePluginHandlerLayer` + `providePluginExtensions` instead. */export const composePluginHandlers = <TPlugins extends readonly AnyPlugin[]>(  plugins: TPlugins,  extensions: PluginExtensions<TPlugins>,): AnyLayer => {  const layers: AnyLayer[] = [];  for (const p of plugins) {    if (!p.handlers) continue;    const handlerLayer = p.handlers();    if (!p.extensionService) {      layers.push(handlerLayer);      continue;    }    const ext = (extensions as Record<string, unknown>)[p.id];    layers.push(      handlerLayer.pipe(        // eslint-disable-next-line @typescript-eslint/no-explicit-any        Layer.provide(Layer.succeed(p.extensionService)(ext as any)),      ),    );  }  // `Layer.empty` is `Layer<never, never, never>`; widening to `AnyLayer`  // (`Layer<any, any, any>`) needs the unknown step because TS can't see  // through Layer's variance markers without it.  // oxlint-disable-next-line executor/no-double-cast  if (layers.length === 0) return Layer.empty as unknown as AnyLayer;  return Layer.mergeAll(...(layers as [AnyLayer, ...AnyLayer[]]));}; /** * Build the merged late-binding Layer of plugin handler implementations * WITHOUT satisfying their `extensionService` Tags. Compose into * `HttpApiBuilder.layer(FullApi)` at boot; satisfy the Tags per-request * via `providePluginExtensions` in an `HttpRouter` middleware. * * The return type is the union of each plugin's `handlers()` Layer * type — that preserves the per-plugin requirements (typically * `*ExtensionService` Tags) so the host's `HttpRouter.middleware` * recognises them as per-request requires. */export const composePluginHandlerLayer = <TPlugins extends readonly AnyPlugin[]>(  plugins: TPlugins,): MergedHandlerLayer<TPlugins> => {  const layers = plugins.flatMap((p) => (p.handlers ? [p.handlers()] : []));  // `MergedHandlerLayer<TPlugins>` is computed from the plugin tuple at  // the type level — TS can't witness that `Layer.mergeAll(...layers)` /  // `Layer.empty` actually produces it without the unknown bridge.  if (layers.length === 0) {    // oxlint-disable-next-line executor/no-double-cast    return Layer.empty as unknown as MergedHandlerLayer<TPlugins>;  }  // oxlint-disable-next-line executor/no-double-cast  return Layer.mergeAll(    ...(layers as [AnyLayer, ...AnyLayer[]]),  ) as unknown as MergedHandlerLayer<TPlugins>;}; /** * Per-request helper: fold each plugin's `extensionService` Tag onto an * effect via `Effect.provideService(tag, executor[id])`. The plugin * spec carries the Tag so the host doesn't import each plugin's * `<plugin>/api` subpath directly. * *   const provide = providePluginExtensions(plugins); *   return yield* httpEffect.pipe(provide(requestExecutor)); */export const providePluginExtensions =  <TPlugins extends readonly AnyPlugin[]>(plugins: TPlugins) =>  (extensions: PluginExtensions<TPlugins>) =>  <A, E, R>(    effect: Effect.Effect<A, E, R>,  ): Effect.Effect<A, E, Exclude<R, PluginExtensionServices<TPlugins>>> => {    // eslint-disable-next-line @typescript-eslint/no-explicit-any    let out: Effect.Effect<A, E, any> = effect;    for (const plugin of plugins) {      if (!plugin.extensionService) continue;      const ext = (extensions as Record<string, unknown>)[plugin.id];      // eslint-disable-next-line @typescript-eslint/no-explicit-any      out = out.pipe(Effect.provideService(plugin.extensionService, ext as any));    }    return out as Effect.Effect<A, E, Exclude<R, PluginExtensionServices<TPlugins>>>;  };