@segment/analytics-next/src/lib/csp-detection.ts

Analytics Next (aka Analytics 2.0) is the latest version of Segment’s JavaScript SDK - enabling you to send your data to any tool without having to learn, test, or use a new API every time.

import { loadScript } from './load-script'
import { getLegacyAJSPath } from './parse-cdn'

type CSPErrorEvent = SecurityPolicyViolationEvent & {
  disposition?: 'enforce' | 'report'
}
export const isAnalyticsCSPError = (e: CSPErrorEvent) => {
  return e.disposition !== 'report' && e.blockedURI.includes('cdn.segment')
}

export async function loadAjsClassicFallback(): Promise<void> {
  console.warn(
    'Your CSP policy is missing permissions required in order to run Analytics.js 2.0',
    'https://segment.com/docs/connections/sources/catalog/libraries/website/javascript/upgrade-to-ajs2/#using-a-strict-content-security-policy-on-the-page'
  )
  console.warn('Reverting to Analytics.js 1.0')

  const classicPath = getLegacyAJSPath()
  await loadScript(classicPath)
}