Index: node_modules/pstree.remy/lib/index.js
===================================================================
--- node_modules/pstree.remy/lib/index.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/pstree.remy/lib/index.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,37 @@
+const exec = require('child_process').exec;
+const tree = require('./tree');
+const utils = require('./utils');
+var hasPS = true;
+
+// discover if the OS has `ps`, and therefore can use psTree
+exec('ps', (error) => {
+  module.exports.hasPS = hasPS = !error;
+});
+
+module.exports = function main(pid, callback) {
+  if (typeof pid === 'number') {
+    pid = pid.toString();
+  }
+
+  if (hasPS && !process.env.NO_PS) {
+    return tree(pid, callback);
+  }
+
+  utils
+    .getStat()
+    .then(utils.tree)
+    .then((tree) => utils.pidsForTree(tree, pid))
+    .then((res) =>
+      callback(
+        null,
+        res.map((p) => p.PID)
+      )
+    )
+    .catch((error) => callback(error));
+};
+
+if (!module.parent) {
+  module.exports(process.argv[2], (e, pids) => console.log(pids));
+}
+
+module.exports.hasPS = hasPS;