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main.go
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main.go
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package main
import (
"embed"
"fmt"
"io"
"io/fs"
"net/http"
"path/filepath"
esbuild "github.com/evanw/esbuild/pkg/api"
"tractor.dev/toolkit-go/engine/fs/xformfs"
)
//go:embed assets
var assets embed.FS
func main() {
http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ext := map[string]bool{
".js": true,
".jsx": true,
".ts": true,
".tsx": true,
}
if _, ok := ext[filepath.Ext(r.URL.Path)]; ok {
w.Header().Set("content-type", "text/javascript")
}
dir, err := fs.Sub(assets, "assets")
if err != nil {
panic(err)
}
xfs := xformfs.New(dir)
xfs.Transform(".jsx", transformJSX)
xfs.Transform(".tsx", transformTSX)
xfs.Transform(".ts", transformTSX)
http.FileServer(http.FS(xfs)).ServeHTTP(w, r)
}))
fmt.Println("Serving at http://localhost:7070/ ...")
http.ListenAndServe(":7070", nil)
}
func transformTSX(dst io.Writer, src io.Reader) error {
b, err := io.ReadAll(src)
if err != nil {
return err
}
result := esbuild.Transform(string(b), esbuild.TransformOptions{
Loader: esbuild.LoaderTSX,
JSXFactory: "m",
JSXFragment: "",
})
if len(result.Errors) > 0 {
fmt.Println(result.Errors)
return fmt.Errorf("TSX transform errors")
}
_, err = dst.Write(append([]byte("\n"), result.Code...))
return err
}
func transformJSX(dst io.Writer, src io.Reader) error {
b, err := io.ReadAll(src)
if err != nil {
return err
}
result := esbuild.Transform(string(b), esbuild.TransformOptions{
Loader: esbuild.LoaderJSX,
JSXFactory: "m",
JSXFragment: "",
})
if len(result.Errors) > 0 {
fmt.Println(result.Errors)
return fmt.Errorf("JSX transform errors")
}
_, err = dst.Write(append([]byte("\n"), result.Code...))
return err
}