From cfb830b5bda0e6112ba47fc32481d03bcc6c3801 Mon Sep 17 00:00:00 2001
From: Logan Smyth <loganfsmyth@gmail.com>
Date: Thu, 22 Feb 2018 18:43:47 -0800
Subject: [PATCH 1/2] Overwrite instead of merging babel-register options.

---
 packages/babel-register/src/node.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/babel-register/src/node.js b/packages/babel-register/src/node.js
index a20514f2a1..9e1e351fbc 100644
--- a/packages/babel-register/src/node.js
+++ b/packages/babel-register/src/node.js
@@ -9,7 +9,7 @@ import fs from "fs";
 import path from "path";
 
 const maps = {};
-const transformOpts = {};
+let transformOpts = {};
 let piratesRevert = null;
 
 function installSourceMapSupport() {
@@ -113,9 +113,9 @@ export default function register(opts?: Object = {}) {
   delete opts.extensions;
   delete opts.cache;
 
-  Object.assign(transformOpts, opts);
+  transformOpts = Object.assign({}, opts);
 
-  if (!transformOpts.ignore && !transformOpts.only) {
+  if (transformOpts.ignore === undefined && transformOpts.only === undefined) {
     transformOpts.only = [
       // Only compile things inside the current working directory.
       new RegExp("^" + escapeRegExp(process.cwd()), "i"),

From a99e9614a66eb3dc0d005c8362c50f628cf68a34 Mon Sep 17 00:00:00 2001
From: Logan Smyth <loganfsmyth@gmail.com>
Date: Thu, 22 Feb 2018 18:48:36 -0800
Subject: [PATCH 2/2] Resolve the babel-register working directory up front.

---
 packages/babel-register/src/node.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/packages/babel-register/src/node.js b/packages/babel-register/src/node.js
index 9e1e351fbc..9dbdf5d659 100644
--- a/packages/babel-register/src/node.js
+++ b/packages/babel-register/src/node.js
@@ -115,16 +115,22 @@ export default function register(opts?: Object = {}) {
 
   transformOpts = Object.assign({}, opts);
 
+  let { cwd = "." } = transformOpts;
+
+  // Ensure that the working directory is resolved up front so that
+  // things don't break if it changes later.
+  cwd = transformOpts.cwd = path.resolve(cwd);
+
   if (transformOpts.ignore === undefined && transformOpts.only === undefined) {
     transformOpts.only = [
       // Only compile things inside the current working directory.
-      new RegExp("^" + escapeRegExp(process.cwd()), "i"),
+      new RegExp("^" + escapeRegExp(cwd), "i"),
     ];
     transformOpts.ignore = [
       // Ignore any node_modules inside the current working directory.
       new RegExp(
         "^" +
-          escapeRegExp(process.cwd()) +
+          escapeRegExp(cwd) +
           "(?:" +
           path.sep +
           ".*)?" +