Function asMiddleware

packages/express/src/middleware.ts:130–154

(
  options: MiddlewareBindingOptions = {},
)

 * @param options - Options to configure the binding
 */
export function asMiddleware(
  options: MiddlewareBindingOptions = {},
): BindingTemplate {
  return function middlewareBindingTemplate(binding) {
    binding.apply(extensionFor(options.chain ?? DEFAULT_MIDDLEWARE_CHAIN));

    if (!binding.tagMap.group) {
      binding.tag({group: options.group ?? DEFAULT_MIDDLEWARE_GROUP});
    }
    const groupsBefore = options.upstreamGroups;
    if (groupsBefore != null) {
      binding.tag({
        upstreamGroups:
          typeof groupsBefore === 'string' ? [groupsBefore] : groupsBefore,
      });
    }
    const groupsAfter = options.downstreamGroups;
    if (groupsAfter != null) {
      binding.tag({
        downstreamGroups:
          typeof groupsAfter === 'string' ? [groupsAfter] : groupsAfter,
      });
    }
  };
}

/**
 * Bind the middleware function or provider class to the context