vite.config.ts

import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
import {resolve} from 'path'

// https://vitejs.dev/config/
export default defineConfig({
  base: '/',
  plugins: [vue()],
  build: {
    lib: {
      // the entry file that is loaded whenever someone imports
      // your plugin in their app
      entry: resolve(__dirname, 'lib/main.js'),

            // the exposed global variable
      // is required when formats includes 'umd' or 'iife'
      name: 'VueSound',

      // the proper extensions will be added, ie:
         // name.js (es module)
         // name.umd.cjs) (common js module)
      // default fileName is the name option of package.json
      fileName: 'vue-sound'
    },
    rollupOptions: {
      // make sure to externalize deps that shouldn't be bundled
      // into your library
      external: ['vue'],
      output: {
        // Provide global variables to use in the UMD build
        // for externalized deps
        globals: {
          vue: 'Vue'
        }
      }
    }
  }
})