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My goal:
I'm trying to babelify source files into a single output file, to be included in a web app.

My problem:
I have included a custom Promise method in my source. When babel polyfills the promise, it attempts to call this method from <polyfilledPromise>.default.customMethod. I have tried adding the custom method to the Promise prototype, but babel doesn't seem to care about the Promise in my source at all.

My Question:
Is there a way to include a custom function in the promise that babel has polyfilled?

The cli command I'm using:

node_modules/.bin/browserify lib/index.js --s Verifier -o verifier.js -t [ babelify --presets [ babel-preset-latest] --plugins [ transform-async-to-generator transform-runtime ] ]

My deps:

  "dependencies": {

    "babel-core": "^6.26.3",

    "babel-plugin-transform-async-to-module-method": "^6.24.1",

    "babel-polyfill": "^6.26.0",

    "babel-preset-env": "^1.6.1",

    "babel-preset-latest": "^6.24.1",

    "babel-regenerator-runtime": "^6.5.0",

    "bigi": "^1.4.2",

    "bitcoinjs-lib": "^2.3.0",

    "bluebird": "^3.5.1",

    "bs58": "^3.0.0",

    "buffer": "^5.0.1",

    "chai": "^3.5.0",

    "debug": "^3.0.1",

    "dev": "^0.1.3",

    "ecurve": "^1.0.4",

    "jsonld": "^0.4.11",

    "mocha": "^3.5.3",

    "sha256": "^0.2.0",

    "string.prototype.startswith": "^0.2.0",

    "tsify": "^3.0.3",

    "verror": "^1.9.0",

    "xmlhttprequest": "^1.8.0"

  },

  "devDependencies": {

    "@babel/core": "^7.2.0",

    "babel-cli": "^6.24.0",

    "babel-plugin-transform-runtime": "^6.23.0",

    "babel-preset-es2015": "^6.24.1",

    "babelify": "^7.3.0",

    "brfs": "^1.4.3",

    "browserify": "^14.3.0",

    "uglify-js": "^3.0.8"

  }

The custom Promise method:

Promise.properRace = function (promises, count, results = ) {

  // Source: https://www.jcore.com/2016/12/18/promise-me-you-wont-use-promise-race/

  promises = Array.from(promises);

  if (promises.length < count) {

    return Promise.reject(new VerifierError("Could not confirm the transaction"));

  }



  let indexPromises = promises.map((p, index) => p.then(() => index).catch((err) => {

    log(err);

    throw index;

  }));



  return Promise.race(indexPromises).then(index => {

    let p = promises.splice(index, 1)[0];

    p.then(e => results.push(e));

    if (count === 1) {

      return results;

    }

    return Promise.properRace(promises, count - 1, results);

  }).catch(index => {

    promises.splice(index, 1);

    return Promise.properRace(promises, count, results);

  });

};

One example of babelified version:

_promise2.default.properRace(promises, count, results);