Add support for new webpack asset manifest format

lib/minipack/manifest.rb

@@ -50,9 +50,11 @@ def initialize(path, cache: false)
     def lookup_pack_with_chunks!(name, type: nil)
       manifest_pack_type = manifest_type(name, type)
       manifest_pack_name = manifest_name(name, manifest_pack_type)
-      paths = data['entrypoints']&.dig(manifest_pack_name, manifest_pack_type) || handle_missing_entry(name)
+      paths = data['entrypoints']&.dig(manifest_pack_name, manifest_pack_type) ||
+        data['entrypoints']&.dig(manifest_pack_name, 'assets', manifest_pack_type) ||
+        handle_missing_entry(name)
 
-      entries = data['entrypoints']&.dig(manifest_pack_name, manifest_pack_type).map do |source|
+      entries = paths.map do |source|
         entry_from_source(source) || handle_missing_entry(name)
       end
 
@@ -107,7 +109,7 @@ def load_data
       JSON.parse(data)
     end
 
-    # The `manifest_name` method strips of the file extension of the name, because in the
+    # The `manifest_name` method strips off the file extension of the name, because in the
     # manifest hash the entrypoints are defined by their pack name without the extension.
     # When the user provides a name with a file extension, we want to try to strip it off.
     def manifest_name(name, pack_type)

spec/minipack/manifest_spec.rb

@@ -16,11 +16,10 @@
   describe '#lookup_pack_with_chunks!' do
     subject { described_class.new(path, cache: false).lookup_pack_with_chunks!(name, type: type) }
 
-    let(:path) { File.expand_path('../support/files/manifest.json', __dir__) }
-    let(:type) { nil }
-
     context 'with name with ext' do
+      let(:path) { File.expand_path('../support/files/manifest.json', __dir__) }
       let(:name) { 'application.js' }
+      let(:type) { nil }
 
       it do
         expected = Minipack::Manifest::ChunkGroup.new(
@@ -33,6 +32,7 @@
     end
 
     context 'with name without ext' do
+      let(:path) { File.expand_path('../support/files/manifest_with_prefetch.json', __dir__) }
       let(:name) { 'application' }
       let(:type) { 'js' }
 
@@ -47,7 +47,9 @@
     end
 
     context 'when non exist name is given' do
+      let(:path) { File.expand_path('../support/files/manifest.json', __dir__) }
       let(:name) { 'foo.js' }
+      let(:type) { nil }
 
       it { expect { subject }.to raise_error Minipack::Manifest::MissingEntryError }
     end

spec/support/files/manifest_with_prefetch.json

@@ -0,0 +1,49 @@
+{
+  "test.js": "/assets/web/pack/test-9a55da116417a39a9d1b.js",
+  "dummy_thumbnail.png": "/assets/web/pack/dummy_thumbnail-757606db2b4802bb4147a968315df2df.png",
+  "icon/avatar.png": "/assets/web/pack/icon/avatar-50b0773f02d0149e39468afa4b6567af.png",
+  "item_group_editor.css": "/packs/item_group_editor-5d7c7164b8a0a9d675fad9ab410eaa8d.css",
+  "item_group_editor.js": "/packs/item_group_editor-857e5bfa272e71b6384046f68ba29d44.js",
+  "item_group_editor.js.map": "/packs/item_group_editor.js.map",
+  "union-ok.png": "/packs/union-ok-857e5bfa272e71b6384046f68ba29d44.png",
+  "union-ok@2x.png": "/packs/union-ok@2x-5d7c7164b8a0a9d675fad9ab410eaa8d.png",
+  "vendors~application~bootstrap.js": "/packs/vendors~application~bootstrap-c20632e7baf2c81200d3.chunk.js",
+  "vendors~application.js": "/packs/vendors~application-e55f2aae30c07fb6d82a.chunk.js",
+  "application.js": "/packs/application-k344a6d59eef8632c9d1.js",
+  "application.css": "/packs/application-k344a6d59eef8632c9d1.chunk.css",
+  "hello_stimulus.css": "/packs/hello_stimulus-k344a6d59eef8632c9d1.chunk.css",
+  "1.css": "/packs/1-c20632e7baf2c81200d3.chunk.css",
+  "entrypoints": {
+    "application": {
+      "assets": {
+        "js": [
+          "/packs/vendors~application~bootstrap-c20632e7baf2c81200d3.chunk.js",
+          "/packs/vendors~application-e55f2aae30c07fb6d82a.chunk.js",
+          "/packs/application-k344a6d59eef8632c9d1.js"
+        ],
+        "css": [
+          "/packs/1-c20632e7baf2c81200d3.chunk.css",
+          "/packs/application-k344a6d59eef8632c9d1.chunk.css"
+        ]
+      },
+      "prefetch": {
+        "js": [
+          "prefetch.js"
+        ]
+      },
+      "preload": {
+        "js": [
+          "preload.js"
+        ]
+      }
+    },
+    "hello_stimulus": {
+      "assets": {
+        "css": [
+          "/packs/1-c20632e7baf2c81200d3.chunk.css",
+          "/packs/hello_stimulus-k344a6d59eef8632c9d1.chunk.css"
+        ]
+      }
+    }
+  }
+}