Seeking Help with AsyncLocalStorage Middleware in Effect-TS

import { AsyncLocalStorage } from 'async_hooks'
import { Context } from 'koa'

export interface RequestContext {
  id: string;
  ...
}

export const asyncLocalStorage = new AsyncLocalStorage<RequestContext>()

export const requestContextMiddleware = async (ctx: Context, next: () => Promise<void>) => {
  ... get id from header or create anew
  ... get other stuff
  await asyncLocalStorage.run({ id, ...otherStuff }, async () => {
    return await next()
  })
}

export const asyncLocalStorage = new AsyncLocalStorage();

export const requestContextMiddleware = HttpMiddleware.make((app) => {
    return Effect.gen(function* () {
      const req = yield* HttpServerRequest.HttpServerRequest;
      const acceptLanguage = req.headers["accept-language"];
      const preferredLanguage = req.headers["x-language"];
      ... get other stuff
      return yield* asyncLocalStorage.run({ id, ...otherStuff  }, () => app);
    });
});

error: "yield" is a reserved word and cannot be used in strict mode