implement custom output paths for entry points

pkg/api/api.go

@@ -271,7 +271,9 @@ type BuildOptions struct {
 	ChunkNames string
 	AssetNames string
 
-	EntryPoints []string
+	EntryPoints         []string
+	EntryPointsAdvanced []EntryPoint
+
 	Stdin       *StdinOptions
 	Write       bool
 	Incremental bool
@@ -280,6 +282,11 @@ type BuildOptions struct {
 	Watch *WatchMode
 }
 
+type EntryPoint struct {
+	InputPath  string
+	OutputPath string
+}
+
 type WatchMode struct {
 	OnRebuild func(BuildResult)
 }

pkg/api/api_impl.go

@@ -792,7 +792,13 @@ func rebuildImpl(
 	for i, path := range buildOpts.NodePaths {
 		options.AbsNodePaths[i] = validatePath(log, realFS, path, "node path")
 	}
-	entryPoints := append([]string{}, buildOpts.EntryPoints...)
+	entryPoints := make([]bundler.EntryPoint, 0, len(buildOpts.EntryPoints)+len(buildOpts.EntryPointsAdvanced))
+	for _, ep := range buildOpts.EntryPoints {
+		entryPoints = append(entryPoints, bundler.EntryPoint{InputPath: ep})
+	}
+	for _, ep := range buildOpts.EntryPointsAdvanced {
+		entryPoints = append(entryPoints, bundler.EntryPoint{InputPath: ep.InputPath, OutputPath: ep.OutputPath})
+	}
 	entryPointCount := len(entryPoints)
 	if buildOpts.Stdin != nil {
 		entryPointCount++

pkg/cli/cli_impl.go

@@ -458,7 +458,14 @@ func parseOptionsImpl(
 			return fmt.Errorf("Unexpected single quote character before flag (use \\\" to escape double quotes): %s", arg), nil
 
 		case !strings.HasPrefix(arg, "-") && buildOpts != nil:
-			buildOpts.EntryPoints = append(buildOpts.EntryPoints, arg)
+			if equals := strings.IndexByte(arg, '='); equals != -1 {
+				buildOpts.EntryPointsAdvanced = append(buildOpts.EntryPointsAdvanced, api.EntryPoint{
+					OutputPath: arg[:equals],
+					InputPath:  arg[equals+1:],
+				})
+			} else {
+				buildOpts.EntryPoints = append(buildOpts.EntryPoints, arg)
+			}
 
 		default:
 			if buildOpts != nil {
@@ -606,7 +613,7 @@ func runImpl(osArgs []string) int {
 		}
 
 		// Read from stdin when there are no entry points
-		if len(buildOptions.EntryPoints) == 0 {
+		if len(buildOptions.EntryPoints)+len(buildOptions.EntryPointsAdvanced) == 0 {
 			if buildOptions.Stdin == nil {
 				buildOptions.Stdin = &api.StdinOptions{}
 			}