ReScript 语言开发实时聊天应用：WebSocket 消息推送与已读标记实现
随着互联网技术的不断发展，实时聊天应用已经成为人们日常生活中不可或缺的一部分。ReScript 语言作为一种新兴的函数式编程语言，以其简洁、高效和类型安全的特点，逐渐受到开发者的青睐。本文将围绕 ReScript 语言，探讨如何开发一个实时聊天应用，包括 WebSocket 消息推送和已读标记的实现。
ReScript 简介
ReScript 是由 Facebook 开发的一种函数式编程语言，它旨在提供一种简洁、高效且类型安全的编程体验。ReScript 可以编译成 JavaScript，因此可以在浏览器和 Node.js 环境中运行。ReScript 的语法类似于 OCaml，但更加简洁，易于学习。
实时聊天应用架构
实时聊天应用通常采用 WebSocket 协议来实现客户端与服务器之间的全双工通信。以下是实时聊天应用的基本架构：
1. 客户端：负责展示聊天界面、发送和接收消息。
2. 服务器：负责处理消息、维护用户状态、推送消息等。
3. 数据库：用于存储用户信息、聊天记录等。
WebSocket 消息推送
WebSocket 是一种在单个 TCP 连接上进行全双工通信的协议。在 ReScript 中，我们可以使用 `ws` 库来实现 WebSocket 通信。
服务器端
我们需要创建一个 WebSocket 服务器。以下是一个简单的 ReScript 服务器示例：
```re
import std.{async, result, option, string, list, map, io, json, core, core/option, core/list, core/map, core/result, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, core/result/ok, core/result/error, 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