Avoid infinite recursion in Error.prepareStackTrace

Previously, prepareStackTraceWithStackAssignment could end up calling
itself when third-party code assigned Error.prepareStackTrace back
to its original value. Now, we short-circuit this process if the
rawStack property has already been assigned.

Signed-off-by: Max Brunsfeld <maxbrunsfeld@github.com>

spec/compile-cache-spec.coffee

@@ -81,6 +81,27 @@ describe 'CompileCache', ->
       waits(1)
       runs ->
         error = new Error("Oops again")
-        console.log error.stack
         expect(error.stack).toContain('compile-cache-spec.coffee')
         expect(Array.isArray(error.getRawStack())).toBe true
+
+    it 'does not infinitely loop when the original prepareStackTrace value is reassigned', ->
+      originalPrepareStackTrace = Error.prepareStackTrace
+
+      Error.prepareStackTrace = -> 'a-stack-trace'
+      Error.prepareStackTrace = originalPrepareStackTrace
+
+      error = new Error('Oops')
+      expect(error.stack).toContain('compile-cache-spec.coffee')
+      expect(Array.isArray(error.getRawStack())).toBe true
+
+    it 'does not infinitely loop when the assigned prepareStackTrace calls the original prepareStackTrace', ->
+      originalPrepareStackTrace = Error.prepareStackTrace
+
+      Error.prepareStackTrace = (error, stack) ->
+        error.foo = 'bar'
+        originalPrepareStackTrace(error, stack)
+
+      error = new Error('Oops')
+      expect(error.stack).toContain('compile-cache-spec.coffee')
+      expect(error.foo).toBe('bar')
+      expect(Array.isArray(error.getRawStack())).toBe true

src/compile-cache.js

@@ -163,8 +163,12 @@ var prepareStackTraceWithSourceMapping = Error.prepareStackTrace
 let prepareStackTrace = prepareStackTraceWithSourceMapping
 
 function prepareStackTraceWithRawStackAssignment (error, frames) {
-  error.rawStack = frames
-  return prepareStackTrace(error, frames)
+  if (error.rawStack) { // avoid infinite recursion
+    return prepareStackTraceWithSourceMapping(error, frames)
+  } else {
+    error.rawStack = frames
+    return prepareStackTrace(error, frames)
+  }
 }
 
 Object.defineProperty(Error, 'prepareStackTrace', {