Adding apiHost from segment.io settings, or default (#1160)

Co-authored-by: Seth Silesky <5115498+silesky@users.noreply.github.com>

.changeset/strong-worms-clap.md

@@ -0,0 +1,5 @@
+---
+'@segment/analytics-next': minor
+---
+
+Adding apiHost to the readonly data available from Analytics.settings

packages/browser/src/browser/__tests__/integration.test.ts

@@ -1041,12 +1041,15 @@ describe('public settings api', () => {
       cdnSettings: cdnSettingsMinimal,
     })
 
-    expect(analytics.settings).toEqual({
-      writeKey,
-      cdnSettings: cdnSettingsMinimal,
-      timeout: 300,
-      cdnURL: 'https://cdn.segment.com',
-    })
+    expect(analytics.settings).toEqual(
+      expect.objectContaining({
+        writeKey,
+        cdnSettings: cdnSettingsMinimal,
+        timeout: 300,
+        cdnURL: 'https://cdn.segment.com',
+        apiHost: 'api.segment.io/v1',
+      })
+    )
   })
 
   it('should have a writeKey', async () => {

packages/browser/src/core/analytics/index.ts

@@ -51,6 +51,10 @@ import {
 } from '../storage'
 import { setGlobalAnalytics } from '../../lib/global-analytics-helper'
 import { popPageContext } from '../buffer'
+import {
+  isSegmentPlugin,
+  SegmentIOPluginMetadata,
+} from '../../plugins/segmentio'
 
 const deprecationWarning =
   'This is being deprecated and will be not be available in future releases of Analytics JS'
@@ -81,13 +85,19 @@ export class AnalyticsInstanceSettings {
    */
   readonly cdnSettings: CDNSettings
   readonly cdnURL?: string
+  get apiHost(): string | undefined {
+    return this._getSegmentPluginMetadata?.()?.apiHost
+  }
+  private _getSegmentPluginMetadata?: () => SegmentIOPluginMetadata | undefined
 
   /**
    * Auto-track specific timeout setting for legacy purposes.
    */
   timeout = 300
 
-  constructor(settings: AnalyticsSettings) {
+  constructor(settings: AnalyticsSettings, queue: EventQueue) {
+    this._getSegmentPluginMetadata = () =>
+      queue.plugins.find(isSegmentPlugin)?.metadata
     this.writeKey = settings.writeKey
     this.cdnSettings = settings.cdnSettings ?? {
       integrations: {},
@@ -201,14 +211,15 @@ export class Analytics
     super()
     const cookieOptions = options?.cookie
     const disablePersistance = options?.disableClientPersistence ?? false
-    this.settings = new AnalyticsInstanceSettings(settings)
+
     this.queue =
       queue ??
       createDefaultQueue(
         `${settings.writeKey}:event-queue`,
         options?.retryQueue,
         disablePersistance
       )
+    this.settings = new AnalyticsInstanceSettings(settings, this.queue)
 
     const storageSetting = options?.storage
     this._universalStorage = this.createStore(

packages/browser/src/plugins/segmentio/index.ts

@@ -50,6 +50,19 @@ function onAlias(analytics: Analytics, json: JSON): JSON {
   return json
 }
 
+export type SegmentIOPluginMetadata = {
+  writeKey: string
+  apiHost: string
+  protocol: string
+}
+export interface SegmentIOPlugin extends Plugin {
+  metadata: SegmentIOPluginMetadata
+}
+
+export const isSegmentPlugin = (plugin: Plugin): plugin is SegmentIOPlugin => {
+  return plugin.name === 'Segment.io'
+}
+
 export function segmentio(
   analytics: Analytics,
   settings?: SegmentioSettings,
@@ -129,7 +142,12 @@ export function segmentio(
       })
   }
 
-  const segmentio: Plugin = {
+  const segmentio: SegmentIOPlugin = {
+    metadata: {
+      writeKey,
+      apiHost,
+      protocol,
+    },
     name: 'Segment.io',
     type: 'destination',
     version: '0.1.0',