Function handler

repos/effect/packages/effect/src/unstable/http/HttpEffect.ts:320–337

(
    request: Request,
    context?: Context.Context<ReqR> | undefined
  )

  let handlerPromise:
    | Promise<(request: Request, context?: Context.Context<ReqR> | undefined) => Promise<globalThis.Response>>
    | undefined
  function handler(
    request: Request,
    context?: Context.Context<ReqR> | undefined
  ): Promise<globalThis.Response> {
    if (handlerCache) {
      return handlerCache(request, context)
    }
    handlerPromise ??= Effect.runPromise(Effect.gen(function*() {
      const context = yield* (options.memoMap
        ? Layer.buildWithMemoMap(layer, options.memoMap, scope)
        : Layer.buildWithScope(layer, scope))
      return handlerCache = toWebHandlerWith<Provided, R>(context)(
        yield* options.toHandler(context),
        options.middleware
      ) as any
    }))
    return handlerPromise.then((f) => f(request, context))
  }
  return { dispose, handler: handler as any } as const
}