Add ability to pass '[ext]' template to output file name templates

internal/bundler/bundler.go

@@ -1812,21 +1812,22 @@ func (s *scanner) processScannedFiles() []scannerFile {
 
 			// Generate the input for the template
 			_, _, originalExt := logger.PlatformIndependentPathDirBaseExt(result.file.inputFile.Source.KeyPath.Text)
-			dir, base, ext := pathRelativeToOutbase(
+			dir, base := pathRelativeToOutbase(
 				&result.file.inputFile,
 				&s.options,
 				s.fs,
-				originalExt,
 				/* avoidIndex */ false,
 				/* customFilePath */ "",
 			)
 
 			// Apply the asset path template
+			templateExt := strings.TrimPrefix(originalExt, ".")
 			relPath := config.TemplateToString(config.SubstituteTemplate(s.options.AssetPathTemplate, config.PathPlaceholders{
 				Dir:  &dir,
 				Name: &base,
 				Hash: &hash,
-			})) + ext
+				Ext:  &templateExt,
+			})) + originalExt
 
 			// Optionally add metadata about the file
 			var jsonMetadataChunk string

internal/bundler/bundler_default_test.go

@@ -4981,3 +4981,35 @@ func TestEntryNamesNonPortableCharacter(t *testing.T) {
 		},
 	})
 }
+
+func TestEntryNamesChunkNamesExtPlaceholder(t *testing.T) {
+	loader_suite.expectBundled(t, bundled{
+		files: map[string]string{
+			"/src/entries/entry1.js":  `import "../lib/shared.js"; import "./entry1.css"; console.log('entry1')`,
+			"/src/entries/entry2.js":  `import "../lib/shared.js"; import "./entry2.css"; console.log('entry2')`,
+			"/src/entries/entry1.css": `a:after { content: "entry1" }`,
+			"/src/entries/entry2.css": `a:after { content: "entry2" }`,
+			"/src/lib/shared.js":      `console.log('shared')`,
+		},
+		entryPaths: []string{
+			"/src/entries/entry1.js",
+			"/src/entries/entry2.js",
+		},
+		options: config.Options{
+			Mode:          config.ModeBundle,
+			AbsOutputBase: "/src",
+			AbsOutputDir:  "/out",
+			CodeSplitting: true,
+			EntryPathTemplate: []config.PathTemplate{
+				{Data: "main/", Placeholder: config.ExtPlaceholder},
+				{Data: "/", Placeholder: config.NamePlaceholder},
+				{Data: "-", Placeholder: config.HashPlaceholder},
+			},
+			ChunkPathTemplate: []config.PathTemplate{
+				{Data: "common/", Placeholder: config.ExtPlaceholder},
+				{Data: "/", Placeholder: config.NamePlaceholder},
+				{Data: "-", Placeholder: config.HashPlaceholder},
+			},
+		},
+	})
+}

internal/bundler/bundler_loader_test.go

@@ -469,6 +469,36 @@ func TestLoaderFileRelativePathAssetNamesJS(t *testing.T) {
 	})
 }
 
+func TestLoaderFileExtPathAssetNamesJS(t *testing.T) {
+	loader_suite.expectBundled(t, bundled{
+		files: map[string]string{
+			"/src/entries/entry.js": `
+				import x from '../images/image.png'
+				import y from '../uploads/file.txt'
+				console.log(x, y)
+			`,
+			"/src/images/image.png": "x",
+			"/src/uploads/file.txt": "y",
+		},
+		entryPaths: []string{"/src/entries/entry.js"},
+		options: config.Options{
+			Mode:          config.ModeBundle,
+			AbsOutputBase: "/src",
+			AbsOutputDir:  "/out",
+			AssetPathTemplate: []config.PathTemplate{
+				{Data: "", Placeholder: config.ExtPlaceholder},
+				{Data: "/", Placeholder: config.NamePlaceholder},
+				{Data: "-", Placeholder: config.HashPlaceholder},
+			},
+			ExtensionToLoader: map[string]config.Loader{
+				".js":  config.LoaderJS,
+				".png": config.LoaderFile,
+				".txt": config.LoaderFile,
+			},
+		},
+	})
+}
+
 func TestLoaderFileRelativePathAssetNamesCSS(t *testing.T) {
 	loader_suite.expectBundled(t, bundled{
 		files: map[string]string{

internal/bundler/linker.go

@@ -610,12 +610,10 @@ func pathRelativeToOutbase(
 	inputFile *graph.InputFile,
 	options *config.Options,
 	fs fs.FS,
-	stdExt string,
 	avoidIndex bool,
 	customFilePath string,
-) (relDir string, baseName string, baseExt string) {
+) (relDir string, baseName string) {
 	relDir = "/"
-	baseExt = stdExt
 	absPath := inputFile.Source.KeyPath.Text
 
 	if customFilePath != "" {
@@ -3034,14 +3032,14 @@ func (c *linkerContext) computeChunks() []chunkInfo {
 				}
 			} else {
 				// Otherwise, derive the output path from the input path
-				dir, base, ext = pathRelativeToOutbase(
+				dir, base = pathRelativeToOutbase(
 					&c.graph.Files[chunk.sourceIndex].InputFile,
 					c.options,
 					c.fs,
-					stdExt,
 					!file.IsUserSpecifiedEntryPoint(),
 					c.graph.EntryPoints()[chunk.entryPointBit].OutputPath,
 				)
+				ext = stdExt
 			}
 		} else {
 			dir = "/"
@@ -3051,10 +3049,12 @@ func (c *linkerContext) computeChunks() []chunkInfo {
 		}
 
 		// Determine the output path template
+		templateExt := strings.TrimPrefix(ext, ".")
 		template = append(append(make([]config.PathTemplate, 0, len(template)+1), template...), config.PathTemplate{Data: ext})
 		chunk.finalTemplate = config.SubstituteTemplate(template, config.PathPlaceholders{
 			Dir:  &dir,
 			Name: &base,
+			Ext:  &templateExt,
 		})
 	}
 

internal/bundler/snapshots/snapshots_loader.txt

@@ -10,6 +10,36 @@ var require_test = __commonJS({
 // entry.js
 console.log(require_test());
 
+================================================================================
+TestEntryNamesChunkNamesExtPlaceholder
+---------- /out/main/js/entry1-L7KI5G7A.js ----------
+import "../../common/js/chunk-XHGYOYUR.js";
+
+// src/entries/entry1.js
+console.log("entry1");
+
+---------- /out/main/js/entry2-KTHKWVT2.js ----------
+import "../../common/js/chunk-XHGYOYUR.js";
+
+// src/entries/entry2.js
+console.log("entry2");
+
+---------- /out/common/js/chunk-XHGYOYUR.js ----------
+// src/lib/shared.js
+console.log("shared");
+
+---------- /out/main/css/entry1-3JZGIUSL.css ----------
+/* src/entries/entry1.css */
+a:after {
+  content: "entry1";
+}
+
+---------- /out/main/css/entry2-NXZBPPIA.css ----------
+/* src/entries/entry2.css */
+a:after {
+  content: "entry2";
+}
+
 ================================================================================
 TestJSXPreserveCapitalLetter
 ---------- /out.js ----------
@@ -116,6 +146,22 @@ var y_default = "./y-YE5AYNFB.txt";
 var x_url = require_x();
 console.log(x_url, y_default);
 
+================================================================================
+TestLoaderFileExtPathAssetNamesJS
+---------- /out/png/image-LSAMBFUD.png ----------
+x
+---------- /out/txt/file-YE5AYNFB.txt ----------
+y
+---------- /out/entries/entry.js ----------
+// src/images/image.png
+var image_default = "../png/image-LSAMBFUD.png";
+
+// src/uploads/file.txt
+var file_default = "../txt/file-YE5AYNFB.txt";
+
+// src/entries/entry.js
+console.log(image_default, file_default);
+
 ================================================================================
 TestLoaderFileMultipleNoCollision
 ---------- /dist/test-J7OMUXO3.txt ----------

internal/config/config.go

@@ -343,6 +343,10 @@ const (
 	// A hash of the contents of this file, and the contents and output paths of
 	// all dependencies (except for their hash placeholders)
 	HashPlaceholder
+
+	// The original extension of the file, or the name of the output file
+	// (e.g. "css", "svg", "png")
+	ExtPlaceholder
 )
 
 type PathTemplate struct {
@@ -354,6 +358,7 @@ type PathPlaceholders struct {
 	Dir  *string
 	Name *string
 	Hash *string
+	Ext  *string
 }
 
 func (placeholders PathPlaceholders) Get(placeholder PathPlaceholder) *string {
@@ -364,6 +369,8 @@ func (placeholders PathPlaceholders) Get(placeholder PathPlaceholder) *string {
 		return placeholders.Name
 	case HashPlaceholder:
 		return placeholders.Hash
+	case ExtPlaceholder:
+		return placeholders.Ext
 	}
 	return nil
 }
@@ -383,6 +390,8 @@ func TemplateToString(template []PathTemplate) string {
 			sb.WriteString("[name]")
 		case HashPlaceholder:
 			sb.WriteString("[hash]")
+		case ExtPlaceholder:
+			sb.WriteString("[ext]")
 		}
 	}
 	return sb.String()

pkg/api/api_impl.go

@@ -65,6 +65,10 @@ func validatePathTemplate(template string) []config.PathTemplate {
 			placeholder = config.HashPlaceholder
 			search += len("[hash]")
 
+		case strings.HasPrefix(tail, "[ext]"):
+			placeholder = config.ExtPlaceholder
+			search += len("[ext]")
+
 		default:
 			// Skip past the "[" so we don't find it again
 			search++