From 330f9006a7a2018dcffc3968b9a30217c55ab54d Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Thu, 9 Nov 2017 15:49:26 -0800
Subject: [PATCH] Add cache.clear() to clear the `data` reference when cache
 option is `false`.

---
 packages/babel-register/src/cache.js |  8 ++++++++
 packages/babel-register/src/node.js  | 11 ++++++++---
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/packages/babel-register/src/cache.js b/packages/babel-register/src/cache.js
index e2494e0248..22b590eb93 100644
--- a/packages/babel-register/src/cache.js
+++ b/packages/babel-register/src/cache.js
@@ -62,3 +62,11 @@ export function load() {
 export function get(): Object {
   return data;
 }
+
+/**
+ * Clear the cache object.
+ */
+
+export function clear() {
+  data = {};
+}
diff --git a/packages/babel-register/src/node.js b/packages/babel-register/src/node.js
index 21729f4fdb..a20514f2a1 100644
--- a/packages/babel-register/src/node.js
+++ b/packages/babel-register/src/node.js
@@ -30,8 +30,7 @@ function installSourceMapSupport() {
   });
 }
 
-registerCache.load();
-let cache = registerCache.get();
+let cache;
 
 function mtime(filename) {
   return +fs.statSync(filename).mtime;
@@ -103,7 +102,13 @@ export default function register(opts?: Object = {}) {
   opts = Object.assign({}, opts);
   if (opts.extensions) hookExtensions(opts.extensions);
 
-  if (opts.cache === false) cache = null;
+  if (opts.cache === false && cache) {
+    registerCache.clear();
+    cache = null;
+  } else if (opts.cache !== false && !cache) {
+    registerCache.load();
+    cache = registerCache.get();
+  }
 
   delete opts.extensions;
   delete opts.cache;