const fs = require('fs') const path = require('path') const camelizeRE = /-(\w)/g const camelize = str => { return str.replace(camelizeRE, (_, c) => c ? c.toUpperCase() : '') } const hyphenateRE = /\B([A-Z])/g const hyphenate = str => { return str.replace(hyphenateRE, '-$1').toLowerCase() } /** * Creates the script to add the component to the custom elements * @param {string} prefix The prefix for the component library * @param {string} component The component name for single entry builds, component file for multi-entry builds * @param {string} file The file for the component * @param {boolean} async Whether to load component async or not */ const createElement = (prefix, component, file, async) => { const { camelName, kebabName } = exports.fileToComponentName(prefix, component) return async ? `window.customElements.define('${kebabName}', wrap(Vue, () => import('~root/${file}?shadow')))\n` : `import ${camelName} from '~root/${file}?shadow'\n` + `window.customElements.define('${kebabName}', wrap(Vue, ${camelName}))\n` } exports.fileToComponentName = (prefix, file) => { const basename = path.basename(file).replace(/\.(jsx?|vue)$/, '') const camelName = camelize(basename) const kebabName = `${prefix ? `${prefix}-` : ``}${hyphenate(basename)}` return { basename, camelName, kebabName } } exports.resolveEntry = (prefix, libName, files, async) => { const filePath = path.resolve(__dirname, 'entry-wc.js') const elements = prefix === '' ? [createElement('', libName, files[0])] : files.map(file => createElement(prefix, file, file, async)).join('\n') const content = ` import './setPublicPath' import Vue from 'vue' import wrap from '@vue/web-component-wrapper' // runtime shared by every component chunk import 'css-loader/lib/css-base' import 'vue-style-loader/lib/addStylesShadow' import 'vue-loader/lib/runtime/componentNormalizer' ${elements}`.trim() fs.writeFileSync(filePath, content) return filePath }