vite.config.ts

import { defineConfig } from 'vite';
import banner from 'vite-plugin-banner';
import vue from '@vitejs/plugin-vue';
import pkg from './package.json';

const year = new Date().getFullYear();
const yearString = year === 2018 ? '2018' : `2018-${year}`;

const minify = process.env.MINIFY === 'yes';

export default defineConfig({
  plugins: [
    vue(),
    banner(`/*! ${pkg.name} v${pkg.version}
 * ${pkg.description}
 * ${pkg.repository}
 * (c) ${yearString} ${pkg.author}
 */
`),
  ],
  build: {
    ...(minify
      ? {
          emptyOutDir: false,
        }
      : {
          minify: false,
        }),
    lib: {
      entry: 'lib/index.ts',
      name: 'VuePageTitle',
      fileName: format => {
        if (minify) {
          return `index.${format}.min.js`;
        }
        return `index.${format}.js`;
      },
      formats: ['cjs', 'es', 'iife', 'umd'],
    },
    rollupOptions: {
      external: ['vue'],
      output: {
        globals: {
          vue: 'Vue',
        },
      },
    },
  },
});