stack_filter.js

// features/support/stack_filter.js

module.exports = function () {
  var path = require('path');
  var filteredPathPrefix = path.resolve(__dirname, '..', '..');
  var originalPrepareStackTrace;

  if (originalPrepareStackTrace = Error.prepareStackTrace) {
    Error.prepareStackTrace = function (error, stack) {
      var originalString = originalPrepareStackTrace(error, stack);
      var string = 'Error: ' + error.message + "\n";
      var lines = originalString.replace('Error: ' + error.message + "\n", '').replace(/\s*$/, '').split("\n");
      var i;
      for (i = 0; i < lines.length; i++) {
        var line = lines[i];
        var callSite = stack[i];
        if (callSite.getFileName().indexOf(filteredPathPrefix) == 0)
          string = string + line + "\n";
      };
      return string;
    };
  }
};

Hi Julien, do you have any explicit licensing for your gists?
Can I treat this as MIT, as with CucumberJS?
Thanks, and kind regards.