stack-displayname)

> Show custom function names in error stack traces

Description

Safari, Chromium and Firefox implemented ability to set custom string as function name via non-standard property displayName.

You can see those custom names in debugger stack and so easier track source of error in long traces of anonymous functions.

Compare stack traces of error before and after using this ability in jBinary:

!Before vs After

However, since this property was implemented on level of developer tools and not JS core itself, in Node.js for analogical code you still get:

!before

This drop-in library stringifies error stack traces in V8 both in browser and Node.js that simulates core formatting but respects displayName property, so when error occurs, you get stylish stack trace:

!after

Installation and usage

$3

Simply install with npm as:

``

bash

npm install stack-displayname





and require it:

javascript

require('stack-displayname');





$3



This script would work only in Chromium, where DevTools already respect

displayName, but in the case you want to have custom function names in err.stack property of any Error

 instances (which is not natively supported), that's possible via simple script tag:

html





Other browsers will just ignore instructions and show stack traces as usual.



$3

javascript

var f = function () {

  throw new Error();

};



f.displayName = "super puper function";



f(); // enjoy descriptive stack trace!

License

Copyright 2014 Ingvar Stepanyan

Copyright 2006-2011, the V8 project authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.