How to pass parameter to a Promise?

This might seem a silly question but I am a newbie in this topic. I am working with Promises on Nodejs and I want to pass a parameter to a Promise function. However I could not figure it out how to do it.

For example:

someModule.someFunction.then(username, password,function(uid) {
  /*stuff */
}

And the function is something like:

var someFunction = new Promise(username, password, function(resolve, reject) {
  /*stuff using username, password*/
  if ( /* everything turned out fine */ ) {
    resolve("Stuff worked!");
  } else {
    reject(Error("It broke"));
  }
});

Wrap your Promise inside a function or it will start to do its job right away. Plus, you can pass parameters to the function:

var some_function = function (username, password) {
  return new Promise(function (resolve, reject) {

    /* stuff using username, password */

    if (/* everything turned out fine */) {
      resolve("Stuff worked!");
    } else {
      reject(Error("It broke"));
    }
  });
};

Then, use it:

some_module.some_function(username, password).then(function (uid) {
  // stuff
});

ES6:

const some_function = (username, password) => {
  return new Promise((resolve, reject) => {

    /* stuff using username, password */

    if (/* everything turned out fine */) {
      resolve("Stuff worked!");
    } else {
      reject(Error("It broke"));
    }
  });
};

Use:

some_module.some_function(username, password).then((uid) => {
  // stuff
});