move seenSurvey_ to a constant and reuse it

src/extensions/surveys/surveys-utils.tsx

@@ -5,7 +5,7 @@ import { VNode, cloneElement, createContext } from 'preact'
 // We cast the types here which is dangerous but protected by the top level generateSurveys call
 const window = _window as Window & typeof globalThis
 const document = _document as Document
-
+const SurveySeenPrefix = 'seenSurvey_'
 export const style = (appearance: SurveyAppearance | null) => {
     const positions = {
         left: 'left: 30px;',
@@ -648,14 +648,26 @@ export const getSurveySeen = (survey: Survey): boolean => {
 }
 
 export const getSurveySeenKey = (survey: Survey): string => {
-    let surveySeenKey = `seenSurvey_${survey.id}`
+    let surveySeenKey = `${SurveySeenPrefix}${survey.id}`
     if (survey.current_iteration && survey.current_iteration > 0) {
-        surveySeenKey = `seenSurvey_${survey.id}_${survey.current_iteration}`
+        surveySeenKey = `${SurveySeenPrefix}${survey.id}_${survey.current_iteration}`
     }
 
     return surveySeenKey
 }
 
+export const getSurveySeenStorageKeys = (): string[] => {
+    const surveyKeys = []
+    for (let i = 0; i < localStorage.length; i++) {
+        const key = localStorage.key(i)
+        if (key?.startsWith(SurveySeenPrefix)) {
+            surveyKeys.push(key)
+        }
+    }
+
+    return surveyKeys
+}
+
 const getSurveyInteractionProperty = (survey: Survey, action: string): string => {
     let surveyProperty = `$survey_${action}/${survey.id}`
     if (survey.current_iteration && survey.current_iteration > 0) {

src/posthog-surveys.ts

@@ -13,6 +13,7 @@ import { assignableWindow, document, window } from './utils/globals'
 import { DecideResponse } from './types'
 import { logger } from './utils/logger'
 import { isNullish } from './utils/type-utils'
+import { getSurveySeenStorageKeys } from './extensions/surveys/surveys-utils'
 
 const LOGGER_PREFIX = '[Surveys]'
 
@@ -75,13 +76,7 @@ export class PostHogSurveys {
 
     reset(): void {
         localStorage.removeItem('lastSeenSurveyDate')
-        const surveyKeys = []
-        for (let i = 0; i < localStorage.length; i++) {
-            const key = localStorage.key(i)
-            if (key?.startsWith('seenSurvey_')) {
-                surveyKeys.push(key)
-            }
-        }
+        const surveyKeys = getSurveySeenStorageKeys()
         surveyKeys.forEach((key) => localStorage.removeItem(key))
     }