@segment/consent-manager/src/index.ts

Drop-in consent management plugin for analytics.js

import CMB from './consent-manager-builder'
import CM from './consent-manager'

export { openDialog as openConsentManager } from './consent-manager/container'
export {
  loadPreferences,
  savePreferences,
  onPreferencesSaved
} from './consent-manager-builder/preferences'

export const ConsentManagerBuilder = CMB
export const ConsentManager = CM

type Nav = Navigator & {
  msDoNotTrack?: Navigator['doNotTrack']
}

export function doNotTrack(): boolean | null {
  
  if (typeof window !== 'undefined' && (window.navigator || navigator)) { 
    const nav = navigator as Nav

    let doNotTrackValue = nav.doNotTrack || window.doNotTrack || nav.msDoNotTrack

    // Normalise Firefox < 32
    // https://developer.mozilla.org/en-US/docs/Web/API/Navigator/doNotTrack
    if (doNotTrackValue === 'yes') {
      doNotTrackValue = '1'
    } else if (doNotTrackValue === 'no') {
      doNotTrackValue = '0'
    }

    if (doNotTrackValue === '1') {
      return true
    }
    if (doNotTrackValue === '0') {
      return false
    }
  }

  return null
}