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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
}