feat: vue build --target multi-wc [pattern]

packages/@vue/cli-service/lib/commands/build/.gitignore

@@ -0,0 +1 @@
+entry-multi-wc.js

packages/@vue/cli-service/lib/commands/build/entry-wc.js

@@ -0,0 +1,8 @@
+import Vue from 'vue'
+import wrap from '@vue/web-component-wrapper'
+import Component from '~entry'
+
+window.customElements.define(
+  process.env.CUSTOM_ELEMENT_NAME,
+  wrap(Vue, Component)
+)

packages/@vue/cli-service/lib/commands/build/generateMultiWcEntry.js

@@ -0,0 +1,31 @@
+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, '-$1').toLowerCase()
+}
+
+module.exports = function generateMultiWebComponentEntry (prefix, files) {
+  const filePath = path.resolve(__dirname, 'entry-multi-wc.js')
+  const content = `
+import Vue from 'vue'
+import wrap from '@vue/web-component-wrapper'
+
+${files.map(file => {
+    const basename = path.basename(file).replace(/\.(jsx?|vue)$/, '')
+    const camelName = camelize(basename)
+    const kebabName = hyphenate(basename)
+    return (
+      `import ${camelName} from '~root/${file}'\n` +
+    `window.customElements.define('${prefix}-${kebabName}', wrap(Vue, ${camelName}))\n`
+    )
+  }).join('\n')}`.trim()
+  fs.writeFileSync(filePath, content)
+  return filePath
+}

packages/@vue/cli-service/lib/commands/build/index.js

@@ -7,21 +7,22 @@ const defaults = {
 module.exports = (api, options) => {
   api.registerCommand('build', {
     description: 'build for production',
-    usage: 'vue-cli-service build [options]',
+    usage: 'vue-cli-service build [options] [entry|pattern]',
     options: {
       '--mode': `specify env mode (default: ${defaults.mode})`,
       '--dest': `specify output directory (default: ${options.outputDir})`,
-      '--target': `app | lib | web-component (default: ${defaults.target})`,
-      '--entry': `entry for lib or web-component (default: ${defaults.entry})`,
-      '--name': `name for lib or web-component (default: "name" in package.json or entry filename)`
+      '--target': `app | lib | wc | multi-wc (default: ${defaults.target})`,
+      '--name': `name for lib or (multi-)web-component mode (default: "name" in package.json or entry filename)`
     }
   }, args => {
+    args.entry = args._[0]
     for (const key in defaults) {
       if (args[key] == null) args[key] = defaults[key]
     }
     if (args.dest == null) {
       args.dest = options.outputDir
     }
+
     api.setMode(args.mode)
 
     const chalk = require('chalk')
@@ -51,7 +52,11 @@ module.exports = (api, options) => {
         let webpackConfig
         if (args.target === 'lib') {
           webpackConfig = require('./resolveLibConfig')(api, args, options)
-        } else if (args.target === 'web-component' || args.target === 'wc') {
+        } else if (
+          args.target === 'web-component' ||
+          args.target === 'wc' ||
+          args.target === 'multi-wc'
+        ) {
           webpackConfig = require('./resolveWebComponentConfig')(api, args, options)
         } else {
           webpackConfig = api.resolveWebpackConfig()

packages/@vue/cli-service/lib/commands/build/resolveWebComponentConfig.js

@@ -1,14 +1,31 @@
 const path = require('path')
 
-module.exports = (api, { entry, name, dest }) => {
-  const libName = name || api.service.pkg.name || entry.replace(/\.(js|vue)$/, '')
-  if (libName.indexOf('-') < 0) {
-    const { log, error } = require('@vue/cli-shared-utils')
+module.exports = (api, { target, entry, name, dest, prefix }) => {
+  const { log, error } = require('@vue/cli-shared-utils')
+  const abort = msg => {
     log()
-    error(`--name must contain a hyphen when building as web-component. (got "${libName}")`)
+    error(msg)
     process.exit(1)
   }
 
+  const libName = name || api.service.pkg.name || entry.replace(/\.(js|vue)$/, '')
+  if (libName.indexOf('-') < 0 && target !== 'multi-wc') {
+    abort(`--name must contain a hyphen with --target web-component. (got "${libName}")`)
+  }
+
+  let dynamicEntry
+  if (target === 'multi-wc') {
+    if (!entry) {
+      abort(`a glob pattern is required with --target multi-web-component.`)
+    }
+    // generate dynamic entry based on glob files
+    const files = require('globby').sync([entry], { cwd: api.resolve('.') })
+    if (!files.length) {
+      abort(`glob pattern "${entry}" did not match any files.`)
+    }
+    dynamicEntry = require('./generateMultiWcEntry')(libName, files)
+  }
+
   // setting this disables app-only configs
   process.env.VUE_CLI_TARGET = 'web-component'
   // inline all static asset files since there is no publicPath handling
@@ -20,18 +37,22 @@ module.exports = (api, { entry, name, dest }) => {
     const config = api.resolveChainableWebpackConfig()
 
     config.entryPoints.clear()
+
     // set proxy entry for *.vue files
-    if (/\.vue$/.test(entry)) {
+    if (target === 'multi-wc') {
       config
-          .entry(`${libName}${minify ? `.min` : ``}`)
-            .add(require.resolve('./entry-web-component.js'))
+        .entry(`${libName}${minify ? `.min` : ``}`)
+          .add(dynamicEntry)
       config.resolve
-          .alias
-            .set('~entry', api.resolve(entry))
+        .alias
+          .set('~root', api.resolve('.'))
     } else {
       config
-          .entry(`${libName}${minify ? `.min` : ``}`)
-            .add(api.resolve(entry))
+        .entry(`${libName}${minify ? `.min` : ``}`)
+          .add(require.resolve('./entry-wc.js'))
+      config.resolve
+        .alias
+          .set('~entry', api.resolve(entry))
     }
 
     // only minify min entry
@@ -70,7 +91,7 @@ module.exports = (api, { entry, name, dest }) => {
       config
         .plugin('demo-html')
           .use(require('html-webpack-plugin'), [{
-            template: path.resolve(__dirname, './demo-web-component.html'),
+            template: path.resolve(__dirname, './demo-wc.html'),
             inject: false,
             filename: 'demo.html',
             libName

packages/@vue/cli-service/lib/webpack/resolveLoaderError.js

@@ -3,7 +3,7 @@ const TYPE = 'cant-resolve-loader'
 const errorRE = /Can't resolve '(.*loader)'/
 
 exports.transformer = error => {
-  if (error.webpackError) {
+  if (error.webpackError && error.webpackError.message) {
     const match = error.webpackError.message.match(errorRE)
     if (match) {
       return Object.assign({}, error, {

packages/@vue/cli-service/package.json

@@ -38,6 +38,7 @@
     "file-loader": "^1.1.6",
     "friendly-errors-webpack-plugin": "^1.6.1",
     "get-value": "^2.0.6",
+    "globby": "^7.1.1",
     "html-webpack-plugin": "^2.30.1",
     "javascript-stringify": "^1.6.0",
     "launch-editor-middleware": "^2.2.0",
@@ -55,7 +56,7 @@
     "thread-loader": "^1.1.2",
     "uglifyjs-webpack-plugin": "^1.1.6",
     "url-loader": "^0.6.2",
-    "vue-loader": "^14.0.3",
+    "vue-loader": "^14.1.0",
     "vue-template-compiler": "^2.5.13",
     "webpack": "^3.10.0",
     "webpack-chain": "^4.5.0",

packages/@vue/cli/bin/vue.js

@@ -64,7 +64,7 @@ program
 
 program
   .command('build [entry]')
-  .option('-t, --target <target>', 'Build target (app | lib | web-component, default: app)')
+  .option('-t, --target <target>', 'Build target (app | lib | wc, default: app)')
   .option('-n, --name <name>', 'name for lib or web-component (default: entry filename)')
   .option('-d, --dest <dir>', 'output directory (default: dist)')
   .description('build a .js or .vue file in production mode with zero config')

yarn.lock

@@ -10077,9 +10077,9 @@ vue-jest@^2.0.0:
     tsconfig "^7.0.0"
     vue-template-es2015-compiler "^1.5.3"
 
-vue-loader@^14.0.3:
-  version "14.0.3"
-  resolved "https://registry.yarnpkg.com/vue-loader/-/vue-loader-14.0.3.tgz#26df42fb2a40e21e9799eb1adc15fff763b99bd2"
+vue-loader@^14.1.0:
+  version "14.1.0"
+  resolved "https://registry.yarnpkg.com/vue-loader/-/vue-loader-14.1.0.tgz#ae31d62a11421061fca8bac30cbc15875df886d3"
   dependencies:
     consolidate "^0.14.0"
     hash-sum "^1.0.2"