feat: load workbox window with dynamic import

src/client/build/register.ts

@@ -1,4 +1,3 @@
-import { Workbox, messageSW } from 'workbox-window'
 import type { RegisterSWOptions } from '../type'
 
 // __SW_AUTO_UPDATE__ will be replaced by virtual module
@@ -24,10 +23,13 @@ export function registerSW(options: RegisterSWOptions = {}) {
     onRegisterError,
   } = options
 
-  let wb: Workbox | undefined
+  let wb: import('workbox-window').Workbox | undefined
   let registration: ServiceWorkerRegistration | undefined
+  let registerPromise: Promise<void>
+  let sendSkipWaitingMessage: () => Promise<void> | undefined
 
   const updateServiceWorker = async (reloadPage = true) => {
+    await registerPromise
     if (!auto) {
       // Assuming the user accepted the update, set up a listener
       // that will reload the page as soon as the previously waiting
@@ -39,58 +41,66 @@ export function registerSW(options: RegisterSWOptions = {}) {
         })
       }
 
-      if (registration && registration.waiting) {
-        // Send a message to the waiting service worker,
-        // instructing it to activate.
-        // Note: for this to work, you have to add a message
-        // listener in your service worker. See below.
-        await messageSW(registration.waiting, { type: 'SKIP_WAITING' })
-      }
+      await sendSkipWaitingMessage?.()
     }
   }
 
-  if ('serviceWorker' in navigator) {
-    // __SW__, __SCOPE__ and __TYPE__ will be replaced by virtual module
-    wb = new Workbox('__SW__', { scope: '__SCOPE__', type: '__TYPE__' })
+  async function register() {
+    const { Workbox, messageSW } = await import('workbox-window')
+    if ('serviceWorker' in navigator) {
+      sendSkipWaitingMessage = async () => {
+        if (registration && registration.waiting) {
+          // Send a message to the waiting service worker,
+          // instructing it to activate.
+          // Note: for this to work, you have to add a message
+          // listener in your service worker. See below.
+          await messageSW(registration.waiting, { type: 'SKIP_WAITING' })
+        }
+      }
+      // __SW__, __SCOPE__ and __TYPE__ will be replaced by virtual module
+      wb = new Workbox('__SW__', { scope: '__SCOPE__', type: '__TYPE__' })
 
-    wb.addEventListener('activated', (event) => {
-      // this will only controls the offline request.
-      // event.isUpdate will be true if another version of the service
-      // worker was controlling the page when this version was registered.
-      if (event.isUpdate)
-        auto && window.location.reload()
-      else if (!autoDestroy)
-        onOfflineReady?.()
-    })
+      wb.addEventListener('activated', (event) => {
+        // this will only controls the offline request.
+        // event.isUpdate will be true if another version of the service
+        // worker was controlling the page when this version was registered.
+        if (event.isUpdate)
+          auto && window.location.reload()
+        else if (!autoDestroy)
+          onOfflineReady?.()
+      })
 
-    if (!auto) {
-      const showSkipWaitingPrompt = () => {
-        // \`event.wasWaitingBeforeRegister\` will be false if this is
-        // the first time the updated service worker is waiting.
-        // When \`event.wasWaitingBeforeRegister\` is true, a previously
-        // updated service worker is still waiting.
-        // You may want to customize the UI prompt accordingly.
+      if (!auto) {
+        const showSkipWaitingPrompt = () => {
+          // \`event.wasWaitingBeforeRegister\` will be false if this is
+          // the first time the updated service worker is waiting.
+          // When \`event.wasWaitingBeforeRegister\` is true, a previously
+          // updated service worker is still waiting.
+          // You may want to customize the UI prompt accordingly.
 
-        // Assumes your app has some sort of prompt UI element
-        // that a user can either accept or reject.
-        onNeedRefresh?.()
+          // Assumes your app has some sort of prompt UI element
+          // that a user can either accept or reject.
+          onNeedRefresh?.()
+        }
+
+        // Add an event listener to detect when the registered
+        // service worker has installed but is waiting to activate.
+        wb.addEventListener('waiting', showSkipWaitingPrompt)
+        // @ts-expect-error event listener provided by workbox-window
+        wb.addEventListener('externalwaiting', showSkipWaitingPrompt)
       }
 
-      // Add an event listener to detect when the registered
-      // service worker has installed but is waiting to activate.
-      wb.addEventListener('waiting', showSkipWaitingPrompt)
-      // @ts-expect-error event listener provided by workbox-window
-      wb.addEventListener('externalwaiting', showSkipWaitingPrompt)
+      // register the service worker
+      wb.register({ immediate }).then((r) => {
+        registration = r
+        onRegistered?.(r)
+      }).catch((e) => {
+        onRegisterError?.(e)
+      })
     }
-
-    // register the service worker
-    wb.register({ immediate }).then((r) => {
-      registration = r
-      onRegistered?.(r)
-    }).catch((e) => {
-      onRegisterError?.(e)
-    })
   }
 
+  registerPromise = register()
+
   return updateServiceWorker
 }