js: Fix js.Batch for multihost setups

Note that this is an unreleased feature.

Fixes #13151

internal/js/api.go

@@ -0,0 +1,51 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package js
+
+import (
+	"context"
+
+	"github.com/gohugoio/hugo/common/maps"
+	"github.com/gohugoio/hugo/resources/resource"
+)
+
+// BatcherClient is used to do JS batch operations.
+type BatcherClient interface {
+	New(id string) (Batcher, error)
+	Store() *maps.Cache[string, Batcher]
+}
+
+// BatchPackage holds a group of JavaScript resources.
+type BatchPackage interface {
+	Groups() map[string]resource.Resources
+}
+
+// Batcher is used to build JavaScript packages.
+type Batcher interface {
+	Build(context.Context) (BatchPackage, error)
+	Config(ctx context.Context) OptionsSetter
+	Group(ctx context.Context, id string) BatcherGroup
+}
+
+// BatcherGroup is a group of scripts and instances.
+type BatcherGroup interface {
+	Instance(sid, iid string) OptionsSetter
+	Runner(id string) OptionsSetter
+	Script(id string) OptionsSetter
+}
+
+// OptionsSetter is used to set options for a batch, script or instance.
+type OptionsSetter interface {
+	SetOptions(map[string]any) string
+}