vant/build/build-entry.js

const fs = require('fs-extra');
const path = require('path');
const Components = require('./get-components')();
const packageJson = require('../package.json');

const camelizeRE = /-(\w)/g;
const pascalizeRE = /(\w)(\w*)/g;

function camelize(str) {
  return str.replace(camelizeRE, (_, c) => c.toUpperCase());
}

function pascalize(str) {
  return camelize(str).replace(
    pascalizeRE,
    (_, c1, c2) => c1.toUpperCase() + c2
  );
}

const version = process.env.VERSION || packageJson.version;
const tips = '// This file is auto generated by build/build-entry.js';

function buildEntry() {
  const uninstallComponents = [
    'Locale',
    'Lazyload',
    'Waterfall'
  ];

  const importList = Components.map(name => `import ${pascalize(name)} from './${name}';`);
  const exportList = Components.map(name => `${pascalize(name)}`);
  const installList = exportList.filter(name => !~uninstallComponents.indexOf(pascalize(name)));
  const content = `${tips}
import { VueConstructor } from 'vue/types';
${importList.join('\n')}

declare global {
  interface Window {
    Vue?: VueConstructor;
  }
}

const version = '${version}';
const components = [
  ${installList.join(',\n  ')}
];

const install = (Vue: VueConstructor) => {
  components.forEach(Component => {
    Vue.use(Component);
  });
};

/* istanbul ignore if */
if (typeof window !== 'undefined' && window.Vue) {
  install(window.Vue);
}

export {
  install,
  version,
  ${exportList.join(',\n  ')}
};

export default {
  install,
  version
};
`;

  fs.writeFileSync(path.join(__dirname, '../src/index.ts'), content);
}

buildEntry();