npm: Detect unsupported Node.js versions and warn

Also error on really old versions where we know we can't work.

Credit: @iarna
Reviewed-By: @othiym23
Reviewed-By: @zkat
PR-URL: npm/npm#14230

bin/npm-cli.js

@@ -16,11 +16,15 @@
 
   process.title = 'npm'
 
+  var unsupported = require('../lib/utils/unsupported.js')
+  unsupported.checkForBrokenNode()
+
   var log = require('npmlog')
   log.pause() // will be unpaused when config is loaded.
-
   log.info('it worked if it ends with', 'ok')
 
+  unsupported.checkForUnsupportedNode()
+
   var path = require('path')
   var npm = require('../lib/npm.js')
   var npmconf = require('../lib/config/core.js')

lib/npm.js

@@ -13,6 +13,9 @@
     return
   }
 
+  var unsupported = require('../lib/utils/unsupported.js')
+  unsupported.checkForBrokenNode()
+
   var gfs = require('graceful-fs')
   // Patch the global fs module here at the app level
   var fs = gfs.gracefulify(require('fs'))

lib/utils/unsupported.js

@@ -0,0 +1,33 @@
+'use strict'
+var semver = require('semver')
+var supportedNode = '0.10 || 0.12 || >= 4'
+var knownBroken = '>=0.1 <=0.7'
+
+var checkVersion = exports.checkVersion = function (version) {
+  var versionNoPrerelease = version.replace(/-.*$/, '')
+  return {
+    broken: semver.satisfies(versionNoPrerelease, knownBroken),
+    unsupported: !semver.satisfies(versionNoPrerelease, supportedNode)
+  }
+}
+
+exports.checkForBrokenNode = function () {
+  var nodejs = checkVersion(process.version)
+  if (nodejs.broken) {
+    console.error('ERROR: npm is known not to run on Node.js ' + process.version)
+    console.error("You'll need to upgrade to a newer version in order to use this")
+    console.error('version of npm. You can find the latest version at https://nodejs.org/')
+    process.exit(1)
+  }
+}
+
+exports.checkForUnsupportedNode = function () {
+  var nodejs = checkVersion(process.version)
+  if (nodejs.unsupported) {
+    var log = require('npmlog')
+    log.warn('npm', 'npm does not support Node.js ' + process.version)
+    log.warn('npm', 'You should probably upgrade to a newer version of node as we')
+    log.warn('npm', "can't make any promises that npm will work with this version.")
+    log.warn('npm', 'You can find the latest version at https://nodejs.org/')
+  }
+}

test/tap/unsupported.js

@@ -0,0 +1,41 @@
+'use strict'
+var test = require('tap').test
+var unsupported = require('../../lib/utils/unsupported.js')
+
+var versions = [
+//            broken  unsupported
+  ['v0.1.103', true, true],
+  ['v0.2.0', true, true],
+  ['v0.3.5', true, true],
+  ['v0.4.7', true, true],
+  ['v0.5.3', true, true],
+  ['v0.6.17', true, true],
+  ['v0.7.8', true, true],
+  ['v0.8.28', false, true],
+  ['v0.9.6', false, true],
+  ['v0.10.48', false, false],
+  ['v0.11.16', false, true],
+  ['v0.12.9', false, false],
+  ['v1.0.1', false, true],
+  ['v1.6.0', false, true],
+  ['v2.3.1', false, true],
+  ['v3.0.0', false, true],
+  ['v4.5.0', false, false],
+  ['v5.7.1', false, false],
+  ['v6.8.1', false, false],
+  ['v7.0.0-beta23', false, false],
+  ['v7.2.3', false, false]
+]
+
+test('versions', function (t) {
+  t.plan(versions.length * 2)
+  versions.forEach(function (verinfo) {
+    var version = verinfo[0]
+    var broken = verinfo[1]
+    var unsupp = verinfo[2]
+    var nodejs = unsupported.checkVersion(version)
+    t.is(nodejs.broken, broken, version + ' ' + (broken ? '' : 'not ') + 'broken')
+    t.is(nodejs.unsupported, unsupp, version + ' ' + (unsupp ? 'unsupported' : 'supported'))
+  })
+  t.done()
+})