Nodejs: get filename of caller function

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Failing to restore the prepareStackTrace function can cause issues. Here’s an example that removes side-effects

function _getCallerFile() {
    var originalFunc = Error.prepareStackTrace;

    var callerfile;
    try {
        var err = new Error();
        var currentfile;

        Error.prepareStackTrace = function (err, stack) { return stack; };

        currentfile = err.stack.shift().getFileName();

        while (err.stack.length) {
            callerfile = err.stack.shift().getFileName();

            if(currentfile !== callerfile) break;
        }
    } catch (e) {}

    Error.prepareStackTrace = originalFunc; 

    return callerfile;
}

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