How to set vite.config.js base public path?

I'm trying to set a base url for both my dev and prod environments, but vitejs configs are not resolved.

According to vitejs , you can set the base public path when served in development or production, in your config options.

When running vite from the command line, Vite will automatically try to resolve a config file named vite.config.js inside project root.

The issue is that my application requests don't go through 'http://localhost:8080/', but are still appended to the default serving port http://localhost:3000/.

My current configs are bellow:

// vite.config.js
export default {
  base: 'http://localhost:8080/'
}

// packages.json
{
  "name": "vue3ui",
  "version": "0.0.0",
  "scripts": {
    "dev": "vite",
    "build": "vite build"
  },
  "dependencies": {
    ...,
    "vue": "^3.0.11"
  },
  "devDependencies": {
    "@vue/compiler-sfc": "^3.0.11",
    "vite": "^1.0.0-rc.13"
  }
}

Solution

~~Not totally clear to me but~~ I will try to give you an answer to achieve what you want.

I'm trying to set a base url for both my dev and prod environments

Edit: I read again you question, and I think you are looking for the point C on this answer.

Changes should be made in vite.config.js

A) You are looking to change the running port from 3000 to 8080, adjust server.port

server: {
  port: '8080'
}

B) But if you are looking to run on localhost:3000 and forward requests to localhost:8080 then you have to adjust server.proxy

server: {
    proxy: {
      '/': {
        target: 'http://localhost:8080/'
      },

      '/admin': {
        target: 'http://localhost:8081/'
      }
    }
  }

example:

'/': will proxy all requests to localhost:8080

'/admin': will proxy only requests that have as endpoint /admin to http://localhost:8081

C) Changing base path depending on dev or prod environment

.env file :

// .env
 
// Running locally
APP_ENV=local
// you change port of local/dev here to :8000
// do not forget to adjust `server.port`
ASSET_URL=http://localhost:3000
 
// Running production build
APP_ENV=production
ASSET_URL=https://your-prod-asset-domain.com

vite.config.js:

const ASSET_URL = process.env.ASSET_URL || '';

export default { 
  base: `${ASSET_URL}/dist/`,

  [...]
}

If it's not what you are looking for, please be more precise and I will edit my answer.

For more information, head to the official doc at https://vitejs.dev/config/#server-options