move helper back to strings dir

__tests__/lib/strings/url-helpers.test.ts

@@ -1,7 +1,6 @@
 import {describe, expect, it} from '@jest/globals'
 
-// co-located with LinkBox.tsx so we can lazy load PSL
-import {splitApexDomain} from '../../../src/components/dialogs/LinkWarning/LinkBox'
+import {splitApexDomain} from '../../../src/lib/strings/url-apex-split'
 import {
   isPossiblyAUrl,
   isTrustedUrl,

src/components/dialogs/LinkWarning/LinkBox.tsx

@@ -1,21 +1,10 @@
 import {useMemo} from 'react'
 import {View} from 'react-native'
-import psl from 'psl'
 
+import {splitApexDomain} from '#/lib/strings/url-apex-split'
 import {atoms as a, useTheme} from '#/alf'
 import {Text} from '#/components/Typography'
 
-export function splitApexDomain(hostname: string): [string, string] {
-  const hostnamep = psl.parse(hostname)
-  if (hostnamep.error || !hostnamep.listed || !hostnamep.domain) {
-    return ['', hostname]
-  }
-  return [
-    hostnamep.subdomain ? `${hostnamep.subdomain}.` : '',
-    hostnamep.domain,
-  ]
-}
-
 export default function LinkBox({href}: {href: string}) {
   const t = useTheme()
   const [scheme, hostname, rest] = useMemo(() => {

src/lib/strings/url-apex-split.ts

@@ -0,0 +1,15 @@
+import psl from 'psl'
+
+/**
+ * NOTE: Expensive import! Try to lazy load when using it.
+ */
+export function splitApexDomain(hostname: string): [string, string] {
+  const hostnamep = psl.parse(hostname)
+  if (hostnamep.error || !hostnamep.listed || !hostnamep.domain) {
+    return ['', hostname]
+  }
+  return [
+    hostnamep.subdomain ? `${hostnamep.subdomain}.` : '',
+    hostnamep.domain,
+  ]
+}