[BUG] Callback is part of promise chain about node-which HOT 2 CLOSED

diff --git a/which.js b/which.js
index 82afffd..1aa94c1 100644
--- a/which.js
+++ b/which.js
@@ -40,6 +40,8 @@ const getPathInfo = (cmd, opt) => {
   }
 }
 
+const escapePromise = fn => (...args) => process.nextTick(() => fn(...args))
+
 const which = (cmd, opt, cb) => {
   if (typeof opt === 'function') {
     cb = opt
@@ -48,6 +50,9 @@ const which = (cmd, opt, cb) => {
   if (!opt)
     opt = {}
 
+  if (cb)
+    cb = escapePromise(cb)
+
   const { pathEnv, pathExt, pathExtExe } = getPathInfo(cmd, opt)
   const found = []