Function apply

packages/engine.io/lib/server.ts:382–395

(i)

    }

    const apply = (i) => {
      debug("applying middleware n°%d", i + 1);
      this.middlewares[i](req, res, (err?: any) => {
        if (err) {
          return callback(err);
        }

        if (i + 1 < this.middlewares.length) {
          apply(i + 1);
        } else {
          callback();
        }
      });
    };

    apply(0);
  }