repl: ensure each REPL instance gets its own "context"

Before there was this weird module-scoped "context" variable which seemingly
shared the "context" of subsequent REPL instances, unless ".clear" was invoked
inside the REPL. To be proper, we need to ensure that each REPL gets its own
"context" object. I literally don't know why this "sharing" behavior was in place
before, but it was just plain wrong.

1 files changed, 9 insertions, 14 deletions

diff --git a/lib/repl.js b/lib/repl.js
index af0d422a44..ba334cfda9 100644
--- a/lib/repl.js
+++ b/lib/repl.js
@@ -57,8 +57,6 @@ function hasOwnProperty(obj, prop) {
 }
 
 
-var context;
-
 // hack for require.resolve("./relative") to work properly.
 module.filename = path.resolve('repl');
 
@@ -327,11 +325,12 @@ exports.start = function(prompt, source, eval_, useGlobal, ignoreUndefined) {
 
 
 REPLServer.prototype.createContext = function() {
-  if (!this.useGlobal) {
-    var context = vm.createContext();
-    for (var i in global) context[i] = global[i];
+  var context;
+  if (this.useGlobal) {
+    context = global;
   } else {
-    var context = global;
+    context = vm.createContext();
+    for (var i in global) context[i] = global[i];
   }
 
   context.module = module;
@@ -345,13 +344,9 @@ REPLServer.prototype.createContext = function() {
   return context;
 };
 
-REPLServer.prototype.resetContext = function(force) {
-  if (!context || force) {
-    context = this.createContext();
-    for (var i in require.cache) delete require.cache[i];
-  }
-
-  this.context = context;
+REPLServer.prototype.resetContext = function() {
+  for (var i in require.cache) delete require.cache[i];
+  this.context = this.createContext();
 };
 
 REPLServer.prototype.displayPrompt = function(preserveCursor) {
@@ -800,7 +795,7 @@ function defineDefaultCommands(repl) {
       this.bufferedCommand = '';
       if (!this.useGlobal) {
         this.outputStream.write('Clearing context...\n');
-        this.resetContext(true);
+        this.resetContext();
       }
       this.displayPrompt();
     }