feat: add internationalization support with next-intl

app/i18n/config.ts

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+export const locales = ['en', 'zh-CN'] as const
+export type Locale = typeof locales[number]
+
+export const defaultLocale: Locale = 'en'
+
+export const i18n = {
+  locales,
+  defaultLocale,
+  localePrefix: 'as-needed',
+}
+

app/i18n/messages/en/auth.json

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+{
+  "signButton": {
+    "login": "Login / Sign Up",
+    "logout": "Logout",
+    "userAvatar": "User Avatar",
+    "linked": "Linked"
+  },
+  "loginForm": {
+    "title": "Welcome to MoeMail",
+    "subtitle": "Cute Temporary Email Service (。・∀・)ノ",
+    "tabs": {
+      "login": "Login",
+      "register": "Sign Up"
+    },
+    "fields": {
+      "username": "Username",
+      "password": "Password",
+      "confirmPassword": "Confirm Password"
+    },
+    "actions": {
+      "login": "Login",
+      "register": "Sign Up",
+      "or": "OR",
+      "githubLogin": "Login with GitHub"
+    },
+    "errors": {
+      "usernameRequired": "Please enter username",
+      "passwordRequired": "Please enter password",
+      "confirmPasswordRequired": "Please confirm password",
+      "usernameInvalid": "Username cannot contain @ symbol",
+      "passwordTooShort": "Password must be at least 8 characters",
+      "passwordMismatch": "Passwords do not match"
+    },
+    "toast": {
+      "loginFailed": "Login Failed",
+      "loginFailedDesc": "Incorrect username or password",
+      "registerFailed": "Registration Failed",
+      "registerFailedDesc": "Please try again later",
+      "autoLoginFailed": "Auto-login failed, please login manually"
+    }
+  }
+}
+

app/i18n/messages/en/common.json

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+{
+  "app": {
+    "name": "MoeMail"
+  },
+  "lang": {
+    "en": "English",
+    "zhCN": "简体中文",
+    "switch": "Switch Language"
+  },
+  "actions": {
+    "ok": "OK",
+    "cancel": "Cancel",
+    "save": "Save",
+    "delete": "Delete"
+  },
+  "nav": {
+    "home": "Home",
+    "login": "Login",
+    "profile": "Profile",
+    "logout": "Logout",
+    "backToMailbox": "Back to Mailbox"
+  },
+  "github": "Get Source Code"
+}
+
+

app/i18n/messages/en/emails.json

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+{
+  "noPermission": {
+    "title": "Insufficient Permission",
+    "description": "You don't have permission to access this page. Please contact the website administrator.",
+    "adminContact": "Admin Contact",
+    "backToHome": "Back to Home"
+  },
+  "layout": {
+    "myEmails": "My Emails",
+    "selectEmail": "Select an email to view messages",
+    "messageContent": "Message Content",
+    "selectMessage": "Select a message to view details",
+    "backToEmailList": "← Back to Email List",
+    "backToMessageList": "← Back to Message List"
+  },
+  "list": {
+    "emailCount": "{count}/{max} emails",
+    "emailCountUnlimited": "{count}/∞ emails",
+    "loading": "Loading...",
+    "loadingMore": "Loading more...",
+    "noEmails": "No emails yet, create one!",
+    "expiresAt": "Expires",
+    "permanent": "Permanent",
+    "deleteConfirm": "Confirm Delete",
+    "deleteDescription": "Are you sure you want to delete {email}? This will also delete all messages in this mailbox and cannot be undone.",
+    "deleteSuccess": "Email deleted successfully",
+    "deleteFailed": "Failed to delete email",
+    "error": "Error",
+    "success": "Success"
+  },
+  "create": {
+    "title": "Create Email",
+    "name": "Email Prefix",
+    "namePlaceholder": "Leave empty for random generation",
+    "domain": "Domain",
+    "domainPlaceholder": "Select a domain",
+    "expiryTime": "Validity Period",
+    "oneHour": "1 Hour",
+    "oneDay": "1 Day",
+    "threeDays": "3 Days",
+    "permanent": "Permanent",
+    "create": "Create",
+    "creating": "Creating...",
+    "success": "Email created successfully",
+    "failed": "Failed to create email"
+  },
+  "messages": {
+    "received": "Received",
+    "sent": "Sent",
+    "noMessages": "No messages yet",
+    "from": "From",
+    "to": "To",
+    "subject": "Subject",
+    "date": "Date",
+    "loading": "Loading...",
+    "loadingMore": "Loading more..."
+  },
+  "send": {
+    "title": "Send Email",
+    "from": "From",
+    "to": "To",
+    "toPlaceholder": "Recipient email address",
+    "subject": "Subject",
+    "subjectPlaceholder": "Email subject",
+    "content": "Content",
+    "contentPlaceholder": "Email content (supports HTML)",
+    "send": "Send",
+    "sending": "Sending...",
+    "success": "Email sent successfully",
+    "failed": "Failed to send email",
+    "dailyLimitReached": "Daily sending limit reached",
+    "dailyLimit": "Daily Limit: {count}/{max}",
+    "dailyLimitUnit": "emails/day"
+  },
+  "messageView": {
+    "loading": "Loading message details...",
+    "loadError": "Failed to load message details",
+    "networkError": "Network error, please try again later",
+    "retry": "Click to retry",
+    "from": "From",
+    "to": "To",
+    "time": "Time",
+    "htmlFormat": "HTML Format",
+    "textFormat": "Plain Text Format"
+  }
+}
+

app/i18n/messages/en/home.json

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+{
+  "title": "MoeMail",
+  "subtitle": "Cute Temporary Email Service",
+  "features": {
+    "privacy": {
+      "title": "Privacy Protection",
+      "description": "Protect your real email address"
+    },
+    "instant": {
+      "title": "Instant Delivery",
+      "description": "Receive emails in real-time"
+    },
+    "expiry": {
+      "title": "Auto Expiry",
+      "description": "Automatically expires when due"
+    }
+  },
+  "actions": {
+    "enterMailbox": "Enter Mailbox",
+    "getStarted": "Get Started"
+  }
+}
+

app/i18n/messages/en/metadata.json

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+{
+  "title": "MoeMail - Cute Temporary Email Service",
+  "description": "Secure, fast, and disposable temporary email addresses. Protect your privacy and stay away from spam. Instant delivery with automatic expiration.",
+  "keywords": "temporary email, disposable email, anonymous email, privacy protection, spam filter, instant delivery, auto expiry, secure email, verification email, temporary account, cute email, email service, privacy security, MoeMail"
+}
+

app/i18n/messages/en/profile.json

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+{
+  "title": "Profile",
+  "card": {
+    "title": "User Information",
+    "name": "Name",
+    "role": "Role",
+    "roles": {
+      "EMPEROR": "Emperor",
+      "DUKE": "Duke",
+      "KNIGHT": "Knight",
+      "CIVILIAN": "Civilian"
+    }
+  },
+  "apiKey": {
+    "title": "API Key Management",
+    "description": "Create and manage API keys for accessing OpenAPI",
+    "create": "Create API Key",
+    "name": "Key Name",
+    "namePlaceholder": "Enter key name",
+    "key": "API Key",
+    "createdAt": "Created At",
+    "copy": "Copy",
+    "delete": "Delete",
+    "noKeys": "No API keys yet",
+    "createSuccess": "API key created successfully",
+    "createFailed": "Failed to create API key",
+    "deleteConfirm": "Confirm Delete",
+    "deleteDescription": "Are you sure you want to delete API key {name}? This action cannot be undone.",
+    "deleteSuccess": "API key deleted successfully",
+    "deleteFailed": "Failed to delete API key",
+    "viewDocs": "View Documentation",
+    "docs": {
+      "getConfig": "Get System Config",
+      "generateEmail": "Generate Temp Email",
+      "getEmails": "Get Email List",
+      "getMessages": "Get Message List",
+      "getMessage": "Get Single Message",
+      "notes": "Notes:",
+      "note1": "Replace YOUR_API_KEY with your actual API Key",
+      "note2": "/api/config endpoint provides system configuration including available email domains",
+      "note3": "emailId is the unique identifier for an email",
+      "note4": "messageId is the unique identifier for a message",
+      "note5": "expiryTime is the validity period in milliseconds: 3600000 (1 hour), 86400000 (1 day), 604800000 (7 days), 0 (permanent)",
+      "note6": "domain is the email domain, get available domains from /api/config endpoint",
+      "note7": "cursor is for pagination, get nextCursor from previous response",
+      "note8": "All requests require X-API-Key header"
+    }
+  },
+  "emailService": {
+    "title": "Resend Email Service Configuration",
+    "configRoleLabel": "Configurable Role Permissions",
+    "enable": "Enable Email Service",
+    "fixedRoleLimits": "Fixed Role Limits",
+    "emperorLimit": "Emperor can send unlimited emails without any restrictions",
+    "civilianLimit": "Cannot send emails",
+    "enableDescription": "When enabled, emails will be sent using Resend",
+    "apiKey": "Resend API Key",
+    "apiKeyPlaceholder": "Enter Resend API Key",
+    "dailyLimit": "Daily Limit",
+    "roleLimits": "Roles allowed to use sending feature",
+    "save": "Save Configuration",
+    "saving": "Saving...",
+    "saveSuccess": "Configuration saved successfully",
+    "saveFailed": "Failed to save configuration",
+    "unlimited": "Unlimited",
+    "disabled": "Sending permission not enabled",
+    "enabled": "Sending permission enabled"
+  },
+  "webhook": {
+    "title": "Webhook Configuration",
+    "description": "Notify specified URL when new emails arrive",
+    "description2": "We will send a POST request to this URL with information about the new email",
+    "description3": "View data format documentation",
+    "enable": "Enable Webhook",
+    "url": "Webhook URL",
+    "urlPlaceholder": "Enter webhook URL",
+    "test": "Test",
+    "testing": "Testing...",
+    "save": "Save Configuration",
+    "saving": "Saving...",
+    "saveSuccess": "Configuration saved successfully",
+    "saveFailed": "Failed to save configuration",
+    "testSuccess": "Webhook test successful",
+    "testFailed": "Webhook test failed",
+    "docs": {
+      "intro": "When a new email is received, we will send a POST request to the configured URL with the following headers:",
+      "exampleBody": "Request body example:",
+      "subject": "Email Subject",
+      "content": "Email text content",
+      "html": "Email HTML content"
+    }
+  },
+  "website": {
+    "title": "Website Configuration",
+    "description": "Configure website settings (Emperor only)",
+    "defaultRole": "Default Role for New Users",
+    "emailDomains": "Email Domains",
+    "emailDomainsPlaceholder": "Separate multiple domains with commas",
+    "adminContact": "Admin Contact",
+    "adminContactPlaceholder": "Email or other contact method",
+    "maxEmails": "Max Emails per User",
+    "save": "Save Configuration",
+    "saving": "Saving...",
+    "saveSuccess": "Configuration saved successfully",
+    "saveFailed": "Failed to save configuration"
+  },
+  "promote": {
+    "title": "Role Management",
+    "description": "Manage user roles (Emperor only)",
+    "search": "Search Users",
+    "searchPlaceholder": "Enter username or email",
+    "username": "Username",
+    "email": "Email",
+    "role": "Role",
+    "actions": "Actions",
+    "promote": "Set as",
+    "noUsers": "No users found",
+    "loading": "Loading...",
+    "updateSuccess": "User role updated successfully",
+    "updateFailed": "Failed to update user role"
+  }
+}
+

app/i18n/messages/zh-CN/auth.json

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+{
+  "signButton": {
+    "login": "登录/注册",
+    "logout": "登出",
+    "userAvatar": "用户头像",
+    "linked": "已关联"
+  },
+  "loginForm": {
+    "title": "欢迎使用 MoeMail",
+    "subtitle": "萌萌哒临时邮箱服务 (。・∀・)ノ",
+    "tabs": {
+      "login": "登录",
+      "register": "注册"
+    },
+    "fields": {
+      "username": "用户名",
+      "password": "密码",
+      "confirmPassword": "确认密码"
+    },
+    "actions": {
+      "login": "登录",
+      "register": "注册",
+      "or": "或者",
+      "githubLogin": "使用 GitHub 账号登录"
+    },
+    "errors": {
+      "usernameRequired": "请输入用户名",
+      "passwordRequired": "请输入密码",
+      "confirmPasswordRequired": "请确认密码",
+      "usernameInvalid": "用户名不能包含 @ 符号",
+      "passwordTooShort": "密码长度必须大于等于8位",
+      "passwordMismatch": "两次输入的密码不一致"
+    },
+    "toast": {
+      "loginFailed": "登录失败",
+      "loginFailedDesc": "用户名或密码错误",
+      "registerFailed": "注册失败",
+      "registerFailedDesc": "请稍后重试",
+      "autoLoginFailed": "自动登录失败，请手动登录"
+    }
+  }
+}
+

app/i18n/messages/zh-CN/common.json

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+{
+  "app": {
+    "name": "MoeMail"
+  },
+  "lang": {
+    "en": "English",
+    "zhCN": "简体中文",
+    "switch": "切换语言"
+  },
+  "actions": {
+    "ok": "确定",
+    "cancel": "取消",
+    "save": "保存",
+    "delete": "删除"
+  },
+  "nav": {
+    "home": "首页",
+    "login": "登录",
+    "profile": "个人中心",
+    "logout": "退出登录",
+    "backToMailbox": "返回邮箱"
+  },
+  "github": "获取网站源代码"
+}
+
+

app/i18n/messages/zh-CN/emails.json

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+{
+  "noPermission": {
+    "title": "权限不足",
+    "description": "你没有权限访问此页面，请联系网站管理员",
+    "adminContact": "管理员联系方式",
+    "backToHome": "返回首页"
+  },
+  "layout": {
+    "myEmails": "我的邮箱",
+    "selectEmail": "选择邮箱查看消息",
+    "messageContent": "邮件内容",
+    "selectMessage": "选择邮件查看详情",
+    "backToEmailList": "← 返回邮箱列表",
+    "backToMessageList": "← 返回消息列表"
+  },
+  "list": {
+    "emailCount": "{count}/{max} 个邮箱",
+    "emailCountUnlimited": "{count}/∞ 个邮箱",
+    "loading": "加载中...",
+    "loadingMore": "加载更多...",
+    "noEmails": "还没有邮箱，创建一个吧！",
+    "expiresAt": "过期时间",
+    "permanent": "永久有效",
+    "deleteConfirm": "确认删除",
+    "deleteDescription": "确定要删除邮箱 {email} 吗？此操作将同时删除该邮箱中的所有邮件，且不可恢复。",
+    "deleteSuccess": "邮箱已删除",
+    "deleteFailed": "删除邮箱失败",
+    "error": "错误",
+    "success": "成功"
+  },
+  "create": {
+    "title": "创建邮箱",
+    "name": "邮箱前缀",
+    "namePlaceholder": "留空则随机生成",
+    "domain": "域名",
+    "domainPlaceholder": "选择域名",
+    "expiryTime": "有效期",
+    "oneHour": "1 小时",
+    "oneDay": "1 天",
+    "threeDays": "3 天",
+    "permanent": "永久",
+    "create": "创建",
+    "creating": "创建中...",
+    "success": "邮箱创建成功",
+    "failed": "创建邮箱失败"
+  },
+  "messages": {
+    "received": "收件箱",
+    "sent": "已发送",
+    "noMessages": "暂无邮件",
+    "from": "发件人",
+    "to": "收件人",
+    "subject": "主题",
+    "date": "日期",
+    "loading": "加载中...",
+    "loadingMore": "加载更多..."
+  },
+  "send": {
+    "title": "发送邮件",
+    "from": "发件人",
+    "to": "收件人",
+    "toPlaceholder": "收件人邮箱地址",
+    "subject": "主题",
+    "subjectPlaceholder": "邮件主题",
+    "content": "内容",
+    "contentPlaceholder": "邮件内容（支持 HTML）",
+    "send": "发送",
+    "sending": "发送中...",
+    "success": "邮件发送成功",
+    "failed": "发送邮件失败",
+    "dailyLimitReached": "已达每日发送上限",
+    "dailyLimit": "每日限额：{count}/{max}",
+    "dailyLimitUnit": "封/天"
+  },
+  "messageView": {
+    "loading": "加载邮件详情...",
+    "loadError": "获取邮件详情失败",
+    "networkError": "网络错误，请稍后重试",
+    "retry": "点击重试",
+    "from": "发件人",
+    "to": "收件人",
+    "time": "时间",
+    "htmlFormat": "HTML 格式",
+    "textFormat": "纯文本格式"
+  }
+}
+

app/i18n/messages/zh-CN/home.json

@@ -0,0 +1,23 @@
+{
+  "title": "MoeMail",
+  "subtitle": "萌萌哒临时邮箱服务",
+  "features": {
+    "privacy": {
+      "title": "隐私保护",
+      "description": "保护您的真实邮箱地址"
+    },
+    "instant": {
+      "title": "即时收件",
+      "description": "实时接收邮件通知"
+    },
+    "expiry": {
+      "title": "自动过期",
+      "description": "到期自动失效"
+    }
+  },
+  "actions": {
+    "enterMailbox": "进入邮箱",
+    "getStarted": "开始使用"
+  }
+}
+

app/i18n/messages/zh-CN/metadata.json

@@ -0,0 +1,6 @@
+{
+  "title": "MoeMail - 萌萌哒临时邮箱服务",
+  "description": "安全、快速、一次性的临时邮箱地址，保护您的隐私，远离垃圾邮件。支持即时收件，到期自动失效。",
+  "keywords": "临时邮箱, 一次性邮箱, 匿名邮箱, 隐私保护, 垃圾邮件过滤, 即时收件, 自动过期, 安全邮箱, 注册验证, 临时账号, 萌系邮箱, 电子邮件, 隐私安全, 邮件服务, MoeMail"
+}
+

app/i18n/messages/zh-CN/profile.json

@@ -0,0 +1,123 @@
+{
+  "title": "个人中心",
+  "card": {
+    "title": "用户信息",
+    "name": "用户名",
+    "role": "角色",
+    "roles": {
+      "EMPEROR": "皇帝",
+      "DUKE": "公爵",
+      "KNIGHT": "骑士",
+      "CIVILIAN": "平民"
+    }
+  },
+  "apiKey": {
+    "title": "API Key 管理",
+    "description": "创建和管理用于访问 OpenAPI 的 API 密钥",
+    "create": "创建 API Key",
+    "name": "密钥名称",
+    "namePlaceholder": "输入密钥名称",
+    "key": "API Key",
+    "createdAt": "创建时间",
+    "copy": "复制",
+    "delete": "删除",
+    "noKeys": "暂无 API Key",
+    "createSuccess": "API Key 创建成功",
+    "createFailed": "创建 API Key 失败",
+    "deleteConfirm": "确认删除",
+    "deleteDescription": "确定要删除 API Key {name} 吗？此操作不可恢复。",
+    "deleteSuccess": "API Key 已删除",
+    "deleteFailed": "删除 API Key 失败",
+    "viewDocs": "查看使用文档",
+    "docs": {
+      "getConfig": "获取系统配置",
+      "generateEmail": "生成临时邮箱",
+      "getEmails": "获取邮箱列表",
+      "getMessages": "获取邮件列表",
+      "getMessage": "获取单封邮件",
+      "notes": "注意：",
+      "note1": "请将 YOUR_API_KEY 替换为你的实际 API Key",
+      "note2": "/api/config 接口可获取系统配置，包括可用的邮箱域名列表",
+      "note3": "emailId 是邮箱的唯一标识符",
+      "note4": "messageId 是邮件的唯一标识符",
+      "note5": "expiryTime 是邮箱的有效期（毫秒），可选值：3600000（1小时）、86400000（1天）、604800000（7天）、0（永久）",
+      "note6": "domain 是邮箱域名，可通过 /api/config 接口获取可用域名列表",
+      "note7": "cursor 用于分页，从上一次请求的响应中获取 nextCursor",
+      "note8": "所有请求都需要包含 X-API-Key 请求头"
+    }
+  },
+  "emailService": {
+    "title": "Resend 发件服务配置",
+    "configRoleLabel": "可配置的角色权限",
+    "enable": "启用邮件服务",
+    "fixedRoleLimits": "固定权限规则",
+    "emperorLimit": "皇帝可以无限发件，不受任何限制",
+    "civilianLimit": "永远不能发件",
+    "enableDescription": "开启后将使用 Resend 发送邮件",
+    "apiKey": "Resend API Key",
+    "apiKeyPlaceholder": "输入 Resend API Key",
+    "dailyLimit": "每日限额",
+    "roleLimits": "允许使用发件功能的角色",
+    "save": "保存配置",
+    "saving": "保存中...",
+    "saveSuccess": "配置保存成功",
+    "saveFailed": "保存配置失败",
+    "unlimited": "无限制",
+    "disabled": "未启用发件权限",
+    "enabled": "已启用发件权限"
+  },
+  "webhook": {
+    "title": "Webhook 配置",
+    "description": "当收到新邮件时通知指定的 URL",
+    "description2": "我们会向此 URL 发送 POST 请求,包含新邮件的相关信息",
+    "description3": "查看数据格式说明",
+    "enable": "启用 Webhook",
+    "url": "Webhook URL",
+    "urlPlaceholder": "输入 webhook URL",
+    "test": "测试",
+    "testing": "测试中...",
+    "save": "保存配置",
+    "saving": "保存中...",
+    "saveSuccess": "配置保存成功",
+    "saveFailed": "保存配置失败",
+    "testSuccess": "Webhook 测试成功",
+    "testFailed": "Webhook 测试失败",
+    "docs": {
+      "intro": "当收到新邮件时，我们会向配置的 URL 发送 POST 请求，请求头包含:",
+      "exampleBody": "请求体示例:",
+      "subject": "邮件主题",
+      "content": "邮件文本内容",
+      "html": "邮件HTML内容"
+    }
+  },
+  "website": {
+    "title": "网站配置",
+    "description": "配置网站设置（仅皇帝可用）",
+    "defaultRole": "新用户默认角色",
+    "emailDomains": "邮箱域名",
+    "emailDomainsPlaceholder": "多个域名用逗号分隔",
+    "adminContact": "管理员联系方式",
+    "adminContactPlaceholder": "邮箱或其他联系方式",
+    "maxEmails": "每个用户最大邮箱数",
+    "save": "保存配置",
+    "saving": "保存中...",
+    "saveSuccess": "配置保存成功",
+    "saveFailed": "保存配置失败"
+  },
+  "promote": {
+    "title": "角色管理",
+    "description": "管理用户角色（仅皇帝可用）",
+    "search": "搜索用户",
+    "searchPlaceholder": "输入用户名或邮箱",
+    "username": "用户名",
+    "email": "邮箱",
+    "role": "角色",
+    "actions": "操作",
+    "promote": "设为",
+    "noUsers": "未找到用户",
+    "loading": "加载中...",
+    "updateSuccess": "用户角色更新成功",
+    "updateFailed": "更新用户角色失败"
+  }
+}
+

app/i18n/request.ts

@@ -0,0 +1,18 @@
+import {getRequestConfig} from 'next-intl/server'
+import {i18n} from '@/i18n/config'
+
+export default getRequestConfig(async ({locale}) => {
+  const safeLocale = (i18n.locales.includes(locale as any) ? locale : i18n.defaultLocale) as string
+  try {
+    const common = (await import(`@/i18n/messages/${safeLocale}/common.json`)).default
+    const home = (await import(`@/i18n/messages/${safeLocale}/home.json`)).default
+    const auth = (await import(`@/i18n/messages/${safeLocale}/auth.json`)).default
+    const metadata = (await import(`@/i18n/messages/${safeLocale}/metadata.json`)).default
+    const emails = (await import(`@/i18n/messages/${safeLocale}/emails.json`)).default
+    const profile = (await import(`@/i18n/messages/${safeLocale}/profile.json`)).default
+    return {locale: safeLocale, messages: {common, home, auth, metadata, emails, profile}}
+  } catch {
+    return {locale: safeLocale, messages: {common: {}, home: {}, auth: {}, metadata: {}, emails: {}, profile: {}}}
+  }
+})
+