feat: support for --registry option in vue add & vue invoke commands (#2698)

closes #1868

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

@@ -67,6 +67,7 @@ program
 program
   .command('add <plugin> [pluginOptions]')
   .description('install a plugin and invoke its generator in an already created project')
+  .option('--registry <url>', 'Use specified npm registry when installing dependencies (only for npm)')
   .allowUnknownOption()
   .action((plugin) => {
     require('../lib/add')(plugin, minimist(process.argv.slice(3)))
@@ -75,6 +76,7 @@ program
 program
   .command('invoke <plugin> [pluginOptions]')
   .description('invoke the generator of a plugin in an already created project')
+  .option('--registry <url>', 'Use specified npm registry when installing dependencies (only for npm)')
   .allowUnknownOption()
   .action((plugin) => {
     require('../lib/invoke')(plugin, minimist(process.argv.slice(3)))

packages/@vue/cli/lib/add.js

@@ -27,7 +27,7 @@ async function add (pluginName, options = {}, context = process.cwd()) {
   log()
 
   const packageManager = loadOptions().packageManager || (hasProjectYarn(context) ? 'yarn' : 'npm')
-  await installPackage(context, packageManager, null, packageName)
+  await installPackage(context, packageManager, options.registry, packageName)
 
   log(`${chalk.green('✔')}  Successfully installed plugin: ${chalk.cyan(packageName)}`)
   log()

packages/@vue/cli/lib/invoke.js

@@ -81,9 +81,11 @@ async function invoke (pluginName, options = {}, context = process.cwd()) {
     throw new Error(`Plugin ${id} does not have a generator.`)
   }
 
-  // resolve options if no command line options are passed, and the plugin
-  // contains a prompt module.
-  if (!Object.keys(options).length) {
+  // resolve options if no command line options (other than --registry) are passed,
+  // and the plugin contains a prompt module.
+  // eslint-disable-next-line prefer-const
+  let { registry, ...pluginOptions } = options
+  if (!Object.keys(pluginOptions).length) {
     let pluginPrompts = loadModule(`${id}/prompts`, context)
     if (pluginPrompts) {
       if (typeof pluginPrompts === 'function') {
@@ -92,14 +94,17 @@ async function invoke (pluginName, options = {}, context = process.cwd()) {
       if (typeof pluginPrompts.getPrompts === 'function') {
         pluginPrompts = pluginPrompts.getPrompts(pkg)
       }
-      options = await inquirer.prompt(pluginPrompts)
+      pluginOptions = await inquirer.prompt(pluginPrompts)
     }
   }
 
   const plugin = {
     id,
     apply: pluginGenerator,
-    options
+    options: {
+      registry,
+      ...pluginOptions
+    }
   }
 
   await runGenerator(context, plugin, pkg)
@@ -134,7 +139,7 @@ async function runGenerator (context, plugin, pkg = getPkg(context)) {
     log()
     const packageManager =
       loadOptions().packageManager || (hasProjectYarn(context) ? 'yarn' : 'npm')
-    await installDeps(context, packageManager)
+    await installDeps(context, packageManager, plugin.options.registry)
   }
 
   if (createCompleteCbs.length) {