config: Enable config for suppressing update-notifier (#20750)

PR-URL: npm/npm#20750
Credit: @travi
Reviewed By: @zkat

bin/npm-cli.js

@@ -74,7 +74,10 @@
   conf._exit = true
   npm.load(conf, function (er) {
     if (er) return errorHandler(er)
-    if (!unsupported.checkVersion(process.version).unsupported) {
+    if (
+      npm.config.get('update-notifier') &&
+      !unsupported.checkVersion(process.version).unsupported
+    ) {
       const pkg = require('../package.json')
       let notifier = require('update-notifier')({pkg})
       if (

doc/misc/npm-config.md

@@ -1130,6 +1130,14 @@ Set to true to suppress the UID/GID switching when running package
 scripts.  If set explicitly to false, then installing as a non-root user
 will fail.
 
+### update-notifier
+
+* Default: true
+* Type: Boolean
+
+Set to false to suppress the update notification when using an older
+version of npm than the latest.
+
 ### usage
 
 * Default: false

lib/config/defaults.js

@@ -234,6 +234,7 @@ Object.defineProperty(exports, 'defaults', {get: function () {
                      !(process.getuid && process.setuid &&
                        process.getgid && process.setgid) ||
                      process.getuid() !== 0,
+    'update-notifier': true,
     usage: false,
     user: process.platform === 'win32' ? 0 : 'nobody',
     userconfig: path.resolve(home, '.npmrc'),
@@ -360,6 +361,7 @@ exports.types = {
   tmp: path,
   unicode: Boolean,
   'unsafe-perm': Boolean,
+  'update-notifier': Boolean,
   usage: Boolean,
   user: [Number, String],
   userconfig: path,

test/tap/config-meta.js

@@ -9,6 +9,7 @@ var fs = require('fs')
 var path = require('path')
 var root = path.resolve(__dirname, '..', '..')
 var lib = path.resolve(root, 'lib')
+var bin = path.resolve(root, 'bin')
 var nm = path.resolve(root, 'node_modules')
 var doc = path.resolve(root, 'doc/misc/npm-config.md')
 var FILES = []
@@ -31,6 +32,7 @@ var exceptions = [
 test('get files', function (t) {
   walk(nm)
   walk(lib)
+  walk(bin)
   t.pass('got files')
   t.end()