Syntax Error: Unexpected token R

[cawoodm]

C:\>npm-windows-upgrade
npm-windows-upgrade v3.1.0
undefined:1
Run `auto` to initialize
^

SyntaxError: Unexpected token R
    at Object.parse (native)
    at C:\Users\xxx\AppData\Roaming\npm\node_modules\npm-windows-upgrade\lib\
versions.js:39:20
    at ChildProcess.exithandler (child_process.js:204:7)
    at emitTwo (events.js:100:13)
    at ChildProcess.emit (events.js:185:7)
    at maybeClose (internal/child_process.js:827:16)
    at Socket.<anonymous> (internal/child_process.js:319:11)
    at emitOne (events.js:90:13)
    at Socket.emit (events.js:182:7)
    at Pipe._onclose (net.js:471:12)

[cawoodm]

The pertinent line in versions.js is:

exec('npm view npm versions --json', function (err, stdout) {

and npm view npm versions --json returns:

C:\temp>npm view npm versions --json
[
  "1.1.25",
  "1.1.70",
  "1.1.71",
  "1.2.19",
  "1.2.20",
  "1.2.21",
  "1.2.22",
  "1.2.23",
  "1.2.24",
  "1.2.25",
  "1.2.27",
  "1.2.28",
  "1.2.30",
  "1.2.31",
  "1.2.32",
  "1.2.8000",
  "1.3.0",
... all the way to
  "3.10.9"
]

[cawoodm]

OK, it seems I had an AutoRun command (HKEY_CURRENT_USER\Software\Microsoft\Command Processor\AutoRun) which was executed every time a new command was entered. It output a message beginning with "R".