项目中vite1.0升级到vite2.0，vite.config.js 配置报错解决方案整理

把项目中vite1.0升级到vite2.0，遇到一些报错，下面是整理的一些解决方法：

1、报错：warning: Duplicate key "server" in object literal

 vite.config.js:67:4: warning: Duplicate key "server" in object literal
    67 │     server: {
       ╵     ~~~~~~
   vite.config.js:29:4: note: The original "server" is here
    29 │     server: {
       ╵    

原因：在vite.config.js里面写了多个server，合在一个里面写就好了

2、报错：Error: Cannot find module 'dotenv'

failed to load config from /Users/duoduo/react-new/tianjin-data-web/vite.config.js
error when starting dev server:
Error: Cannot find module 'dotenv'
Require stack:

解决：安装 npm install dotenv

3、报错：No loader is configured for ".vue"

src/main.ts:19:22: error: No loader is configured for ".vue" files: src/components/v-login-box.vue
    19 │ import vLoginBox from "/@/components/v-about.vue"
       ╵                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

解决：把vite.config.js中的alias中的"/@/"改为"@"，并且全局搜索"/@/"，用"@/"替换

resolve: {
    alias: {
        "@": path.resolve(__dirname, "./src"),
        "public": path.resolve(__dirname, "./public"),
    },
},

4、接口报错404，原因：代理没有生效，按照下面修改server，要加host和post

server: {
    port: process.env.VITE_PORT,
    // 是否自动在浏览器打开
    open: true,
    // 是否开启 https
    https: false,
    proxy: {
        '/api': {
            target: 'http://localhost:3333/',
            changeOrigin: true,
            rewrite: (pathStr) => pathStr.replace('/api', '')
        },
    },
},

5、build打包到生产环境图片，字体资源路径404

解决办法：先排查build中assetsDir路径，看打包后指向路径是否对的上，如果问题没解决，再检查图片路径是否放在了public，静态资源一定要放在public

build: {
    minify: "esbuild",
    assetsDir: "",
    outDir: `./dist/${process.env.VITE_ENV}`,
},

最后放上总的vite.config.js配置

const fs = require("fs");
import path from "path";
// Dotenv 是一个零依赖的模块，它能将环境变量中的变量从 .env 文件加载到 process.env 中
const dotenv = require("dotenv");
import { defineConfig } from "vite";
import vue from "@vitejs/plugin-vue";
const envFiles = [
    /** default file */
    `.env`,
    /** mode file */
    `.env.${process.env.NODE_ENV}`,
];

for (const file of envFiles) {
    const envConfig = dotenv.parse(fs.readFileSync(file));
    for (const k in envConfig) {
        process.env[k] = envConfig[k];
    }
}

export default defineConfig({
    plugins: [vue()],
    base: "./",
    server: {
        port: process.env.VITE_PORT,
        // 是否自动在浏览器打开
        open: true,
        // 是否开启 https
        https: false,
        proxy: {
            '/api': {
                target: 'http://localhost:3333/',
                changeOrigin: true,
                rewrite: (pathStr) => pathStr.replace('/api', '')
            },
        },
    },
    resolve: {
        alias: {
            "@": path.resolve(__dirname, "./src"),
            "public": path.resolve(__dirname, "./public"),
        },
    },
    optimizeDeps: {
        include: [
            "element-plus",
            "element-plus/lib/locale/lang/zh-cn",
            "dayjs/locale/zh-cn",
        ],
    },
    build: {
        // 压缩
        minify: "esbuild",
        assetsDir: "",
        outDir: `./dist/${process.env.VITE_ENV}`,
    },
});