feat($core): info command (#1573)

packages/docs/docs/api/cli.md

@@ -46,6 +46,10 @@ do not clear screen when dev server is ready.
 
 Copy the default theme into `.vuepress/theme` for customization.
 
+## info
+
+Shows debugging information about the local environment.
+
 ## more commands
 
 You can create a custom command with [extendCli](../plugin/option-api.md#extendcli).

packages/vuepress/lib/registerCoreCommands.js

@@ -4,6 +4,9 @@
  * Module dependencies.
  */
 
+const { chalk } = require('@vuepress/shared-utils')
+const envinfo = require('envinfo')
+
 const { dev, build, eject } = require('@vuepress/core')
 const { path, logger, env } = require('@vuepress/shared-utils')
 const { wrapCommand } = require('./util')
@@ -69,4 +72,23 @@ module.exports = function (cli, options) {
     .action((dir = '.') => {
       wrapCommand(eject)(path.resolve(dir))
     })
+
+  cli
+    .command('info', 'Shows debugging information about the local environment')
+    .action(() => {
+      console.log(chalk.bold('\nEnvironment Info:'))
+      envinfo.run(
+        {
+          System: ['OS', 'CPU'],
+          Binaries: ['Node', 'Yarn', 'npm'],
+          Browsers: ['Chrome', 'Edge', 'Firefox', 'Safari'],
+          npmPackages: ['/**/{@vuepress/*/}']
+        },
+        {
+          showNotFound: true,
+          duplicates: true,
+          fullTree: true
+        }
+      ).then(console.log)
+    })
 }

packages/vuepress/package.json

@@ -31,7 +31,8 @@
   "dependencies": {
     "@vuepress/core": "^1.0.0-alpha.47",
     "@vuepress/theme-default": "^1.0.0-alpha.47",
-    "cac": "^6.3.9"
+    "cac": "^6.3.9",
+    "envinfo": "^7.2.0"
   },
   "engines": {
     "node": ">=8.6"