add boxen to version-checker output

bin/npm-cli.js

@@ -98,12 +98,16 @@
     })
   })
 
-  var versionCheckerMessages = []
-  versionChecker.check()
-    .stdout.on('data', function (data) {
-      versionCheckerMessages.push(data.toString())
+  if (process.stdout.isTTY) {
+    var versionCheckerMessages = []
+    versionChecker.check()
+      .stdout.on('data', function (data) {
+        versionCheckerMessages.push(data.toString())
+      })
+    process.on('exit', () => {
+      if (versionCheckerMessages.length > 0) {
+        console.error(versionCheckerMessages.join('\n'))
+      }
     })
-  process.on('exit', () => {
-    console.error(versionCheckerMessages.join('\n'))
-  })
+  }
 })()

lib/utils/version-checker.js

@@ -1,3 +1,4 @@
+const boxen = require('boxen')
 const log = require('npmlog')
 const pacote = require('pacote')
 const semver = require('semver')
@@ -61,7 +62,7 @@ function generateMessage (oldVersion, latestVersion, diffType, npm) {
   }
   const changelog = `https://github.com/npm/cli/releases/tag/v${latestVersion}`
 
-  return `New ${diffType} version of npm available! ${
+  let message = `New ${diffType} version of npm available! ${
     useColor ? color.red(oldVersion) : oldVersion
   } ${useUnicode ? '→' : '->'} ${
     useColor ? color.green(latestVersion) : latestVersion
@@ -76,4 +77,13 @@ function generateMessage (oldVersion, latestVersion, diffType, npm) {
       ? color.green(`npm install -g npm`)
       : `npm i -g npm`
   } to update!`
+
+  const boxenOptions = {
+    padding: 1,
+    margin: 1,
+    align: 'center',
+    borderColor: 'yellow',
+    borderStyle: 'round'
+  }
+  return boxen(message, boxenOptions)
 }

package.json

@@ -41,6 +41,7 @@
     "archy": "~1.0.0",
     "bin-links": "^1.1.2",
     "bluebird": "~3.5.1",
+    "boxen": "^1.3.0",
     "byte-size": "^4.0.3",
     "cacache": "^11.1.0",
     "call-limit": "~1.1.0",
@@ -151,6 +152,7 @@
     "cacache",
     "call-limit",
     "bluebird",
+    "boxen",
     "bin-links",
     "chownr",
     "cmd-shim",
@@ -245,7 +247,6 @@
     "umask",
     "unique-filename",
     "unpipe",
-    "update-notifier",
     "uuid",
     "validate-npm-package-license",
     "validate-npm-package-name",