vant/packages/vant-cli/src/config/vite.package.ts

import { join } from 'node:path';
import { setBuildTarget } from '../common/index.js';
import { CWD, ES_DIR, getVantConfig, LIB_DIR } from '../common/constant.js';
import type { InlineConfig } from 'vite';
import type { BundleOption } from '../compiler/compile-bundles.js';

export function getViteConfigForPackage({
  minify,
  formats,
  external = [],
}: BundleOption): InlineConfig {
  setBuildTarget('package');

  const { name, build } = getVantConfig();
  const entryExtension = build?.extensions?.esm || '.js';
  const entry = join(ES_DIR, `index${entryExtension}`);
  const shouldReplaceEnv = minify || formats?.includes('umd');

  return {
    root: CWD,

    logLevel: 'silent',

    define: shouldReplaceEnv
      ? {
          'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV),
        }
      : undefined,

    build: {
      emptyOutDir: false,

      lib: {
        name,
        entry,
        formats,
        fileName: (format: string) => {
          const suffix = format === 'umd' ? '' : `.${format}`;
          return minify ? `${name}${suffix}.min.js` : `${name}${suffix}.js`;
        },
      },

      // terser has better compression than esbuild
      minify: minify ? 'terser' : false,
      rollupOptions: {
        external: [...external, 'vue'],
        output: {
          dir: LIB_DIR,
          exports: 'named',
          globals: {
            vue: 'Vue',
          },
        },
      },
    },
  };
}