Get caller file path by throwing error and parse the stack trace (in this example for module "rerequire").

caller_path.js

var caller_path = undefined; // ...but...but no known native way in Node.js to know what file that triggered the current method.... ='(

try {
  // ...so let's break some code of honors! >:)
  throw Error();

} catch (err) {
  var stack_lines = err.stack.split('\n'),
      found_this = false;

  for (var i in stack_lines) {
    var line = stack_lines[i];

    if (!found_this && /rerequire\.js/.test(line)) {
      // Tjing 1/2: Found this module!
      found_this = true

    } else if (found_this) {
      if (!/rerequire\.js/.test(line)) {
        // Tjing 2/2: Found the module that called this module!
        caller_path = line.match(/^[^\/]+([^\:]+)\:/)[1]; // <-- SUCCESS >:)

        break;
      }
    }

  }

  console.log(caller_path) // ...and mwuaha, we can get the caller file from the stack trace string. >:)
}