example vite config

vite.config.ts/.js for vite 2.9.0 or higher

import { defineConfig } from 'vite';
import vue from '@vitejs/plugin-vue';
import legacy from '@vitejs/plugin-legacy';

// https://vitejs.dev/config/
export default defineConfig({
    plugins: [
        vue(),
        legacy({
            targets: ['defaults', 'not IE 11']
        })
    ],
    build: {
        emptyOutDir: false,
        outDir: './public/',
        assetsDir: 'build',
        manifest: true,
        rollupOptions: {
            input: './public_src/main.ts',
        },
    },
    server: {
        port: 3000,
        strictPort: true,
        hmr: {
            protocol: 'ws',
            host: 'localhost',
        },
    },
});

older versions

vite below 2.9.0

Note that the server.hmr.port must be moved to server.port when updating to vite 2.9.0

import { defineConfig } from 'vite';
import vue from '@vitejs/plugin-vue';
import legacy from '@vitejs/plugin-legacy';

// https://vitejs.dev/config/
export default defineConfig({
    plugins: [
        vue(),
        legacy({
            targets: ['defaults', 'not IE 11']
        })
    ],
    build: {
        emptyOutDir: false,
        outDir: './public/',
        assetsDir: 'build',
        manifest: true,
        rollupOptions: {
            input: './public_src/main.ts',
        },
    },
    server: {
        hmr: {
            protocol: 'ws',
            host: 'localhost',
            port: 3000,
        },
    },
});