ほう・・・Next.jsですか・・・。知らない子ですね。

app
　└item
　｜　└page.tsx(/item)
　└user
　｜　└page.tsx(/user)
　└layout.tsx
　└page.tsx(/)

app
　└item
　｜　└page.tsx(/item)
　｜　└layout.tsx
　└user
　｜　└page.tsx(/user)
　└layout.tsx
　└page.tsx(/)

function NextAuth(options: AuthOptions): any

export interface AuthOptions {
  /**
   * An array of authentication providers for signing in
   * (e.g. Google, Facebook, Twitter, GitHub, Email, etc) in any order.
   * This can be one of the built-in providers or an object with a custom provider.
   * * **Default value**: `[]`
   * * **Required**: *Yes*
   *
   * [Documentation](https://next-auth.js.org/configuration/options#providers) | [Providers documentation](https://next-auth.js.org/configuration/providers)
   */
  providers: Provider[]
  /**
   * A random string used to hash tokens, sign cookies and generate cryptographic keys.
   * If not specified, it falls back to `jwt.secret` or `NEXTAUTH_SECRET` from environment variables.
   * Otherwise, it will use a hash of all configuration options, including Client ID / Secrets for entropy.
   *
   * NOTE: The last behavior is extremely volatile, and will throw an error in production.
   * * **Default value**: `string` (SHA hash of the "options" object)
   * * **Required**: No - **but strongly recommended**!
   *
   * [Documentation](https://next-auth.js.org/configuration/options#secret)
   */
  secret?: string
  /**
   * Configure your session settings, such as determining whether to use JWT or a database,
   * setting the idle session expiration duration, or implementing write operation throttling for database usage.
   * * **Default value**: See the documentation page
   * * **Required**: No
   *
   * [Documentation](https://next-auth.js.org/configuration/options#session)
   */
  session?: Partial<SessionOptions>
  /**
   * JSON Web Tokens are enabled by default if you have not specified an adapter.
   * JSON Web Tokens are encrypted (JWE) by default. We recommend you keep this behaviour.
   * * **Default value**: See the documentation page
   * * **Required**: *No*
   *
   * [Documentation](https://next-auth.js.org/configuration/options#jwt)
   */
  jwt?: Partial<JWTOptions>
  /**
   * Specify URLs to be used if you want to create custom sign in, sign out and error pages.
   * Pages specified will override the corresponding built-in page.
   * * **Default value**: `{}`
   * * **Required**: *No*
   * @example
   *
   * ```js
   *   pages: {
   *     signIn: '/auth/signin',
   *     signOut: '/auth/signout',
   *     error: '/auth/error',
   *     verifyRequest: '/auth/verify-request',
   *     newUser: '/auth/new-user'
   *   }
   * ```
   *
   * [Documentation](https://next-auth.js.org/configuration/options#pages) | [Pages documentation](https://next-auth.js.org/configuration/pages)
   */
  pages?: Partial<PagesOptions>
  /**
   * Callbacks are asynchronous functions you can use to control what happens when an action is performed.
   * Callbacks are *extremely powerful*, especially in scenarios involving JSON Web Tokens
   * as they **allow you to implement access controls without a database** and to **integrate with external databases or APIs**.
   * * **Default value**: See the Callbacks documentation
   * * **Required**: *No*
   *
   * [Documentation](https://next-auth.js.org/configuration/options#callbacks) | [Callbacks documentation](https://next-auth.js.org/configuration/callbacks)
   */
  callbacks?: Partial<CallbacksOptions>
  /**
   * Events are asynchronous functions that do not return a response, they are useful for audit logging.
   * You can specify a handler for any of these events below - e.g. for debugging or to create an audit log.
   * The content of the message object varies depending on the flow
   * (e.g. OAuth or Email authentication flow, JWT or database sessions, etc),
   * but typically contains a user object and/or contents of the JSON Web Token
   * and other information relevant to the event.
   * * **Default value**: `{}`
   * * **Required**: *No*
   *
   * [Documentation](https://next-auth.js.org/configuration/options#events) | [Events documentation](https://next-auth.js.org/configuration/events)
   */
  events?: Partial<EventCallbacks>
  /**
   * You can use the adapter option to pass in your database adapter.
   *
   * * **Required**: *No*
   *
   * [Documentation](https://next-auth.js.org/configuration/options#adapter) |
   * [Adapters Overview](https://next-auth.js.org/adapters/overview)
   */
  adapter?: Adapter
  /**
   * Set debug to true to enable debug messages for authentication and database operations.
   * * **Default value**: `false`
   * * **Required**: *No*
   *
   * - ⚠ If you added a custom `logger`, this setting is ignored.
   *
   * [Documentation](https://next-auth.js.org/configuration/options#debug) | [Logger documentation](https://next-auth.js.org/configuration/options#logger)
   */
  debug?: boolean
  /**
   * Override any of the logger levels (`undefined` levels will use the built-in logger),
   * and intercept logs in NextAuth. You can use this option to send NextAuth logs to a third-party logging service.
   * * **Default value**: `console`
   * * **Required**: *No*
   *
   * @example
   *
   * ```js
   * // /pages/api/auth/[...nextauth].js
   * import log from "logging-service"
   * export default NextAuth({
   *   logger: {
   *     error(code, ...message) {
   *       log.error(code, message)
   *     },
   *     warn(code, ...message) {
   *       log.warn(code, message)
   *     },
   *     debug(code, ...message) {
   *       log.debug(code, message)
   *     }
   *   }
   * })
   * ```
   *
   * - ⚠ When set, the `debug` option is ignored
   *
   * [Documentation](https://next-auth.js.org/configuration/options#logger) |
   * [Debug documentation](https://next-auth.js.org/configuration/options#debug)
   */
  logger?: Partial<LoggerInstance>
  /**
   * Changes the theme of pages.
   * Set to `"light"` if you want to force pages to always be light.
   * Set to `"dark"` if you want to force pages to always be dark.
   * Set to `"auto"`, (or leave this option out)if you want the pages to follow the preferred system theme.
   * * **Default value**: `"auto"`
   * * **Required**: *No*
   *
   * [Documentation](https://next-auth.js.org/configuration/options#theme) | [Pages documentation]("https://next-auth.js.org/configuration/pages")
   */
  theme?: Theme
  /**
   * When set to `true` then all cookies set by NextAuth.js will only be accessible from HTTPS URLs.
   * This option defaults to `false` on URLs that start with `http://` (e.g. http://localhost:3000) for developer convenience.
   * You can manually set this option to `false` to disable this security feature and allow cookies
   * to be accessible from non-secured URLs (this is not recommended).
   * * **Default value**: `true` for HTTPS and `false` for HTTP sites
   * * **Required**: No
   *
   * [Documentation](https://next-auth.js.org/configuration/options#usesecurecookies)
   *
   * - ⚠ **This is an advanced option.** Advanced options are passed the same way as basic options,
   * but **may have complex implications** or side effects.
   * You should **try to avoid using advanced options** unless you are very comfortable using them.
   */
  useSecureCookies?: boolean
  /**
   * You can override the default cookie names and options for any of the cookies used by NextAuth.js.
   * You can specify one or more cookies with custom properties,
   * but if you specify custom options for a cookie you must provide all the options for that cookie.
   * If you use this feature, you will likely want to create conditional behavior
   * to support setting different cookies policies in development and production builds,
   * as you will be opting out of the built-in dynamic policy.
   * * **Default value**: `{}`
   * * **Required**: No
   *
   * - ⚠ **This is an advanced option.** Advanced options are passed the same way as basic options,
   * but **may have complex implications** or side effects.
   * You should **try to avoid using advanced options** unless you are very comfortable using them.
   *
   * [Documentation](https://next-auth.js.org/configuration/options#cookies) | [Usage example](https://next-auth.js.org/configuration/options#example)
   */
  cookies?: Partial<CookiesOptions>
}