Error hacking

apply-error.js

function applyFilename(err) {
  var descriptor = Object.getOwnPropertyDescriptor(err, 'stack');
  var getter = descriptor.get;
  descriptor.get = function () {
    var lines = getter.call(this).split(/[\r\n]+/g);
    if (this.fileName) {
      lines[0] += ' in ' + this.fileName;
    }
    return lines.join('\n');
  };
  Object.defineProperty(err, 'stack', descriptor);
  return err;
}

try {
  try {
    throw new applyFilename(new Error('bad JSON'));
  } catch (e) {
    e.message = 'really, really, really bad JSON';
    e.fileName = '/a/b/c/d/bad-json.json';
    throw e;
  }
} catch (e) {
  console.error(e.stack);
}

try {
  try {
    throw new applyFilename(new Error('bad JSON'));
  } catch (e) {
    e.message = 'unknown filename';
    throw e;
  }
} catch (e) {
  console.error(e.stack);
}

output.txt

$ node test
Error: really, really, really bad JSON in /a/b/c/d/bad-json.json
    at Object.<anonymous> (/private/tmp/pkg/test.js:17:29)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3
Error: unknown filename
    at Object.<anonymous> (/private/tmp/pkg/test.js:29:29)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

Almost, I would like to have the .fileName added to the err.message.

Basically, I want:

SyntaxError: Trailing comma in object at 3:1
}
^

To become this when .fileName is set:

SyntaxError: Trailing comma in object at 3:1 in /a/b/c/d/bad-json.json
}
^