1 files changed, 86 insertions, 0 deletions
diff --git a/internal/js/esbuild/resolve_test.go b/internal/js/esbuild/resolve_test.go
new file mode 100644
index 000000000..86e3138f2
--- /dev/null
+++ b/internal/js/esbuild/resolve_test.go
@@ -0,0 +1,86 @@
+// 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 esbuild
+
+import (
+	"path"
+	"path/filepath"
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+	"github.com/gohugoio/hugo/config"
+	"github.com/gohugoio/hugo/config/testconfig"
+	"github.com/gohugoio/hugo/hugofs"
+	"github.com/gohugoio/hugo/hugolib/filesystems"
+	"github.com/gohugoio/hugo/hugolib/paths"
+	"github.com/spf13/afero"
+)
+
+func TestResolveComponentInAssets(t *testing.T) {
+	c := qt.New(t)
+
+	for _, test := range []struct {
+		name    string
+		files   []string
+		impPath string
+		expect  string
+	}{
+		{"Basic, extension", []string{"foo.js", "bar.js"}, "foo.js", "foo.js"},
+		{"Basic, no extension", []string{"foo.js", "bar.js"}, "foo", "foo.js"},
+		{"Basic, no extension, typescript", []string{"foo.ts", "bar.js"}, "foo", "foo.ts"},
+		{"Not found", []string{"foo.js", "bar.js"}, "moo.js", ""},
+		{"Not found, double js extension", []string{"foo.js.js", "bar.js"}, "foo.js", ""},
+		{"Index file, folder only", []string{"foo/index.js", "bar.js"}, "foo", "foo/index.js"},
+		{"Index file, folder and index", []string{"foo/index.js", "bar.js"}, "foo/index", "foo/index.js"},
+		{"Index file, folder and index and suffix", []string{"foo/index.js", "bar.js"}, "foo/index.js", "foo/index.js"},
+		{"Index ESM file, folder only", []string{"foo/index.esm.js", "bar.js"}, "foo", "foo/index.esm.js"},
+		{"Index ESM file, folder and index", []string{"foo/index.esm.js", "bar.js"}, "foo/index", "foo/index.esm.js"},
+		{"Index ESM file, folder and index and suffix", []string{"foo/index.esm.js", "bar.js"}, "foo/index.esm.js", "foo/index.esm.js"},
+		// We added these index.esm.js cases in v0.101.0. The case below is unlikely to happen in the wild, but add a test
+		// to document Hugo's behavior. We pick the file with the name index.js; anything else would be breaking.
+		{"Index and Index ESM file, folder only", []string{"foo/index.esm.js", "foo/index.js", "bar.js"}, "foo", "foo/index.js"},
+
+		// Issue #8949
+		{"Check file before directory", []string{"foo.js", "foo/index.js"}, "foo", "foo.js"},
+	} {
+		c.Run(test.name, func(c *qt.C) {
+			baseDir := "assets"
+			mfs := afero.NewMemMapFs()
+
+			for _, filename := range test.files {
+				c.Assert(afero.WriteFile(mfs, filepath.Join(baseDir, filename), []byte("let foo='bar';"), 0o777), qt.IsNil)
+			}
+
+			conf := testconfig.GetTestConfig(mfs, config.New())
+			fs := hugofs.NewFrom(mfs, conf.BaseConfig())
+
+			p, err := paths.New(fs, conf)
+			c.Assert(err, qt.IsNil)
+			bfs, err := filesystems.NewBase(p, nil)
+			c.Assert(err, qt.IsNil)
+			resolver := newFSResolver(bfs.Assets.Fs)
+
+			got := resolver.resolveComponent(test.impPath)
+
+			gotPath := ""
+			expect := test.expect
+			if got != nil {
+				gotPath = filepath.ToSlash(got.Filename)
+				expect = path.Join(baseDir, test.expect)
+			}
+
+			c.Assert(gotPath, qt.Equals, expect)
+		})
+	}
+}