chore: update docs (#42)

docs/config/farm-config.md

@@ -731,6 +731,42 @@ export function hmrPlugin(devServer: DevServer) {
 
 Then configure the plugin into `server.plugins`.
 
+
+## Environment variable 
+
+`Farm` distinguishes between development and production environments through `Farm` process.env.NODE_ ENV`.
+
+In different environments, environment variables are replaced statically, so use static constants to represent environment variables instead of dynamic expressions.
+
+### `.env` file
+
+`Farm` uses `dotenv` to load your additional environment variables, such as `.env` files.
+
+```js
+// .env
+FARM_APP_SECRET=secret
+Farm_APP_PASSWORD=password
+APP_VERSION=1.0.0
+```
+
+`Farm` loads the file `.env` via dotenv, and loads it into `process.env` and finally injects it into define.
+
+:::warning
+In order to ensure the security of the client, preventing the environment variables in the current system from being exposed to the client `Farm` will only identify some important environment variables that start with `Farm`.
+:::
+
+`Farm` expands environment variables through dotenv-expand
+
+
+If you want to customize the prefix of env variables, you can configure `envPrefix`.
+
+### envPrefix  
+
+* **default value**: `FARM_`
+
+Customize the prefix of the `env` variable by configuring `envPrefix`.
+
+
 ## Plugins Options
 Configure Farm's plug-ins, support Rust plug-ins or Js plug-ins, examples are as follows:
 

i18n/zh/docusaurus-plugin-content-docs/current/config/farm-config.md

@@ -733,6 +733,44 @@ export function hmrPlugin(devServer: DevServer) {
 然后将该插件配置到 `server.plugins` 中。
 
 
+## Environment variable 环境变量
+
+`Farm` 通过 `process.env.NODE_ENV` 来区分开发和生产环境。
+
+在不同环境中, 环境变量会被静态替换, 所以请使用静态的常量来表示环境变量, 而不是动态的表达式.
+
+### `.env` 文件
+
+`Farm` 使用 `dotenv` 来加载您的额外的环境变量, 例如 `.env` 文件.
+
+```js
+// .env
+FARM_APP_SECRET=secret
+Farm_APP_PASSWORD=password
+APP_VERSION=1.0.0
+```
+
+`Farm` 会通过 dotenv 加载 `.env` 文件, 并且将其加载到 `process.env` 中 最终在 define 中注入.
+
+:::warning
+为了保证客户端安全, 防止将当前系统中的环境变量暴露给客户端 `Farm` 只会识别以 `FARM_` 开头和一些重要的环境变量.
+:::
+
+`Farm` 通过 dotenv-expand 来拓展环境变量
+
+
+如果你想自定义 env 变量的前缀，可以配置 `envPrefix`。
+
+### envPrefix env 变量前缀
+
+* **默认值**: `FARM_`
+
+通过配置 `envPrefix` 来自定义 `env` 变量的前缀。
+
+```ts
+
+
+
 ## Plugins Options
 配置 Farm 的插件，支持 Rust 插件或者 Js 插件，示例如下：