feat: support manifest.fileName with template

closes #193. Huge thanks to @mdawar and @AlexAsh

Author: pooya parsa

lib/manifest/module.js

@@ -29,7 +29,8 @@ function addManifest (pwa) {
     background_color: '#ffffff',
     theme_color: this.options.loading && this.options.loading.color,
     lang: 'en',
-    useWebmanifestExtension: false
+    useWebmanifestExtension: false,
+    fileName: 'manifest.[hash].[ext]'
   }
 
   const options = { ...defaults, ...pwa.manifest }
@@ -39,16 +40,12 @@ function addManifest (pwa) {
   delete manifest.src
   delete manifest.publicPath
   delete manifest.useWebmanifestExtension
+  delete manifest.fileName
 
-  // Stringify manifest & generate hash
-  const manifestSource = JSON.stringify(manifest)
-  const manifestFileName = `manifest.${
-      hash(manifestSource).substr(0, 8)
-    }.${
-      options.useWebmanifestExtension
-      ? 'webmanifest'
-      : 'json'
-    }`
+  // Generate file name
+  const manifestFileName = options.fileName
+    .replace('[hash]', hash(JSON.stringify(manifest)).substr(0, 8))
+    .replace('[ext]', options.useWebmanifestExtension ? 'webmanifest' : 'json')
 
   // Merge final manifest into options.manifest for other modules
   if (!this.options.manifest) {
@@ -57,6 +54,7 @@ function addManifest (pwa) {
   Object.assign(this.options.manifest, manifest)
 
   // Register webpack plugin to emit manifest
+  const manifestSource = JSON.stringify(manifest, null, 2)
   this.options.build.plugins.push({
     apply (compiler) {
       compiler.hooks.emit.tap('nuxt-pwa-manifest', (compilation) => {

test/__snapshots__/pwa.test.js.snap

@@ -17,7 +17,7 @@ Array [
   "fixture/.nuxt/dist/client/icons/icon_384.b8f3a1.png",
   "fixture/.nuxt/dist/client/icons/icon_512.b8f3a1.png",
   "fixture/.nuxt/dist/client/icons/icon_64.b8f3a1.png",
-  "fixture/.nuxt/dist/client/manifest.bee706d5.webmanifest",
+  "fixture/.nuxt/dist/client/manifest_test.webmanifest",
   "fixture/.nuxt/dist/server",
   "fixture/.nuxt/dist/server/index.spa.html",
   "fixture/.nuxt/dist/server/index.ssr.html",
@@ -44,7 +44,7 @@ Array [
   "fixture/dist/_nuxt/icons/icon_384.b8f3a1.png",
   "fixture/dist/_nuxt/icons/icon_512.b8f3a1.png",
   "fixture/dist/_nuxt/icons/icon_64.b8f3a1.png",
-  "fixture/dist/_nuxt/manifest.bee706d5.webmanifest",
+  "fixture/dist/_nuxt/manifest_test.webmanifest",
   "fixture/dist/icon.png",
   "fixture/dist/index.html",
   "fixture/dist/offline.html",

test/fixture/nuxt.config.js

@@ -13,7 +13,8 @@ module.exports = {
   manifest: {
     name: 'Test Project Name',
     description: 'Test Project Description',
-    useWebmanifestExtension: true
+    useWebmanifestExtension: true,
+    fileName: 'manifest_test.[ext]?[hash]'
   },
 
   workbox: {

test/pwa.test.js

@@ -36,8 +36,8 @@ describe('pwa', () => {
 
   test('icons purpose', () => {
     const assetDir = path.join(nuxt.options.generate.dir, '_nuxt')
-    const manifestFileName = fs.readdirSync(assetDir).find(item => item.match(/^manifest.+\.json$/i))
-    const manifestContent = JSON.parse(fs.readFileSync(path.join(assetDir, manifestFileName)))
+    const manifestFileName = fs.readdirSync(assetDir).find(item => item.match(/^manifest./i))
+    const manifestContent = JSON.parse(fs.readFileSync(path.join(assetDir, manifestFileName.split('?')[0])))
     expect(manifestContent.icons).toEqual(
       expect.arrayContaining([
         expect.objectContaining({