A bootstrap file for a simple pref flip study helper addon

bootstrap.js

// https://github.com/gregglind/quantum-preference-telemetry-annotation-pretender/blob/master/index.js

const CID = Cu.import('resource://gre/modules/ClientID.jsm');
const { TelemetryController } = Cu.import('resource://gre/modules/TelemetryController.jsm');
const { TelemetryEnvironment } = Cu.import('resource://gre/modules/TelemetryEnvironment.jsm');


function generateTelemetryIdIfNeeded() {
  let id = TelemetryController.clientID;
  /* istanbul ignore next */
  if (id === undefined) {
    return CID.ClientIDImpl._doLoadClientID();
  } else {
    return Promise.resolve(id);
  }
}

const experimentName = "screenshots-rollout-test-1";
const variations = ['control', 'screenshots-on'];

function chooseVariation (clientId) {
  // do some hashing magic of the client id, such as:
  let last = clientId.substr(clientId.length-3);
  let which = parseInt(last,16) % variations.length;
  return variations[which];
}

function isEligible() {
  // check locales or whatever
  return true;
}

function markTelemetry (which) {
  
}

function unmarkTelemetry (which) {
  
}

function implement(variation) {
  markTelemetry(variation)

  switch (variation) {
    case "control":
      // don't set the pref to the value
      break;
    default:
      setThePref(someValue)
  }
} 


function startup () {
  let variation = chooseVariation(clientId);
  impelement(variation)
}


function shutdown () {
  // blah blah
}