fix(sw-cache): use empty array instead of null in routingExtensions

Author: mentAl-maZe

lib/module.js

@@ -35,7 +35,7 @@ const laravelModule = function (overwrites) {
     // Optional cache module
     if (config.cache) {
         const pwa = utils_1.getModuleOptions(this.options, '@nuxtjs/pwa');
-        const routingExtensions = (pwa && pwa.workbox && pwa.workbox.routingExtensions) || null;
+        const routingExtensions = (pwa && pwa.workbox && pwa.workbox.routingExtensions) || [];
         const { dst } = this.addTemplate({
             src: path_1.default.join(__dirname, 'templates', 'workbox.cache.ejs'),
             options: config.cache,

src/module.ts

@@ -49,7 +49,7 @@ const laravelModule: Module<Options> = function(overwrites) {
   if (config.cache) {
     const pwa = getModuleOptions(this.options, '@nuxtjs/pwa')
     const routingExtensions =
-      (pwa && pwa.workbox && pwa.workbox.routingExtensions) || null
+      (pwa && pwa.workbox && pwa.workbox.routingExtensions) || []
 
     const { dst } = this.addTemplate({
       src: path.join(__dirname, 'templates', 'workbox.cache.ejs'),