From e85c9b633a72afdc58c6ce3a483f8fcfe50caeca Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Wed, 14 Jan 2015 14:55:30 +1100
Subject: [PATCH] enable require hook cache by default - shove it into into a
 temp directory - don't cache require resolutions

---
 lib/6to5/register-cache.js | 36 ++++++++++++++++++++++++++++++++++++
 lib/6to5/register.js       | 14 ++++++--------
 package.json               |  1 -
 3 files changed, 42 insertions(+), 9 deletions(-)
 create mode 100644 lib/6to5/register-cache.js

diff --git a/lib/6to5/register-cache.js b/lib/6to5/register-cache.js
new file mode 100644
index 0000000000..992e24cf4e
--- /dev/null
+++ b/lib/6to5/register-cache.js
@@ -0,0 +1,36 @@
+"use strict";
+
+var path = require("path");
+var os   = require("os");
+var fs   = require("fs");
+
+var FILENAME = path.join(os.tmpdir(), "6to5.json");
+var data = {};
+
+exports.save = function () {
+  fs.writeFileSync(FILENAME, JSON.stringify(data, null, "  "));
+};
+
+exports.load = function () {
+  if (!fs.existsSync(FILENAME)) return;
+
+  try {
+    data = JSON.parse(fs.readFileSync(FILENAME));
+  } catch (err) {
+    return;
+  }
+
+  process.on("exit", exports.save);
+
+  var sigint = function () {
+    process.removeListener("SIGINT", sigint);
+    exports.save();
+    process.kill(process.pid, "SIGINT");
+  };
+
+  process.on("SIGINT", sigint);
+};
+
+exports.get = function () {
+  return data;
+};
diff --git a/lib/6to5/register.js b/lib/6to5/register.js
index d73532e1e9..06515c8827 100644
--- a/lib/6to5/register.js
+++ b/lib/6to5/register.js
@@ -1,7 +1,7 @@
 require("./polyfill");
 
 var sourceMapSupport = require("source-map-support");
-var roadrunner       = require("roadrunner");
+var registerCache    = require("./register-cache");
 var util             = require("./util");
 var to5              = require("./index");
 var fs               = require("fs");
@@ -66,11 +66,15 @@ blacklistTest("unicodeRegex", function () { new RegExp("foo", "u"); });
 
 //
 
+registerCache.load();
+var cache = registerCache.get();
+
+//
+
 var transformOpts = {};
 var ignoreRegex   = /node_modules/;
 var onlyRegex;
 var whitelist     = [];
-var cache;
 var exts          = {};
 var maps          = {};
 var old           = require.extensions[".js"];
@@ -136,13 +140,7 @@ module.exports = function (opts) {
 
   if (opts.extensions) hookExtensions(util.arrayify(opts.extensions));
 
-  if (opts.cache) cache = opts.cache;
   if (opts.cache === false) cache = null;
-  if (opts.cache === true) {
-    roadrunner.load();
-    roadrunner.setup();
-    cache = roadrunner.get("6to5");
-  }
 
   _.extend(transformOpts, opts);
 };
diff --git a/package.json b/package.json
index e387b2052b..a81e4bf6c8 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,6 @@
     "private": "0.1.6",
     "regenerator": "^0.8.3",
     "regexpu": "0.3.0",
-    "roadrunner": "^1.0.4",
     "source-map": "0.1.40",
     "source-map-support": "0.2.8"
   },