Value assigned to locals is not accepted.

LocalsNotAnObject: locals 只能被赋值为一个对象。不接受如数字、字符串等其他值。

哪里发生了错误？

在开发模式下，当 locals 被赋值为一个非对象时抛出错误。

例如：

import { defineMiddleware } from "astro:middleware";
export const onRequest = defineMiddleware((context, next) => {
  context.locals = 1541;
  return next();
});