diff --git a/internal/esr/mode.go b/internal/esr/mode.go
index 77f202f..917c63e 100644
--- a/internal/esr/mode.go
+++ b/internal/esr/mode.go
@@ -40,6 +40,7 @@ func ModeOptions(config *config.Config, mode ModeType, entryPoint, tempFilePath
 		buildOptions.JSXFactory = config.Build.JSXFactory
 		buildOptions.JSXImportSource = config.Build.JSXImportSource
 		buildOptions.Sourcemap = getSourceMap(config.Build.Sourcemap)
+		buildOptions.External = config.Build.External
 	case ModeServer:
 		buildOptions.Bundle = config.Serve.Bundle
 		buildOptions.Outdir = config.Serve.Outdir
@@ -49,6 +50,7 @@ func ModeOptions(config *config.Config, mode ModeType, entryPoint, tempFilePath
 		buildOptions.JSXFactory = config.Serve.JSXFactory
 		buildOptions.JSXImportSource = config.Serve.JSXImportSource
 		buildOptions.Sourcemap = getSourceMap(config.Serve.Sourcemap)
+		buildOptions.External = config.Serve.External
 	case ModeRunner:
 		buildOptions.Bundle = true
 		buildOptions.Format = api.FormatESModule
@@ -56,6 +58,7 @@ func ModeOptions(config *config.Config, mode ModeType, entryPoint, tempFilePath
 		buildOptions.Outfile = tempFilePath
 		buildOptions.Outdir = ""
 		buildOptions.Sourcemap = getSourceMap(config.Run.Sourcemap)
+		buildOptions.External = config.Run.External
 	}
 
 	// Apply format