fix: do not blow up if process is missing

index.js

@@ -1,4 +1,8 @@
 'use strict'
+const proc = typeof process === 'object' && process ? process : {
+  stdout: null,
+  stderr: null,
+}
 const EE = require('events')
 const Stream = require('stream')
 const Yallist = require('yallist')
@@ -310,7 +314,7 @@ module.exports = class Minipass extends Stream {
 
     const ended = this[EMITTED_END]
     opts = opts || {}
-    if (dest === process.stdout || dest === process.stderr)
+    if (dest === proc.stdout || dest === proc.stderr)
       opts.end = false
     else
       opts.end = opts.end !== false

test/no-process-ok.js

@@ -0,0 +1,12 @@
+const tap = require('tap')
+const proc = global.process
+global.process = null
+const MP = require('../')
+const src = new MP()
+const dest = new MP({ encoding: 'utf8' })
+src.pipe(dest)
+src.end('ok')
+const result = dest.read()
+global.process = proc
+const t = require('tap')
+t.equal(result, 'ok')