Fix exception when global Error.stackTraceLimit is too low

fixes #9

Author: dougwilson

History.md

@@ -1,3 +1,8 @@
+unreleased
+==========
+
+  * Fix exception when global `Error.stackTraceLimit` is too low
+
 0.4.2 / 2014-07-19
 ==================
 

index.js

@@ -363,15 +363,18 @@ function formatLocation(callSite) {
  */
 
 function getStack() {
+  var limit = Error.stackTraceLimit
   var obj = {}
   var prep = Error.prepareStackTrace
 
   Error.prepareStackTrace = prepareObjectStackTrace
+  Error.stackTraceLimit = Math.max(10, limit)
   Error.captureStackTrace(obj, getStack)
 
   var stack = obj.stack
 
   Error.prepareStackTrace = prep
+  Error.stackTraceLimit = limit
 
   return stack
 }

test/test.js

@@ -40,6 +40,19 @@ describe('deprecate(message)', function () {
     stderr.should.match(/\.js:[0-9]+:[0-9]+/)
   })
 
+  it('should log call site regardless of Error.stackTraceLimit', function () {
+    function callold() { mylib.old() }
+    var limit = Error.stackTraceLimit
+    try {
+      Error.stackTraceLimit = 1
+      var stderr = captureStderr(callold)
+      stderr.should.containEql(basename(__filename))
+      stderr.should.match(/\.js:[0-9]+:[0-9]+/)
+    } finally {
+      Error.stackTraceLimit = limit
+    }
+  })
+
   it('should log call site within eval', function () {
     function callold() { eval('mylib.old()') }
     var stderr = captureStderr(callold)