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Avoid copying content when writing files #1551

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4 changes: 3 additions & 1 deletion internal/vfs/iovfs/iofs.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import (
"fmt"
"io/fs"
"strings"
"unsafe"

"github.com/microsoft/typescript-go/internal/stringutil"
"github.com/microsoft/typescript-go/internal/tspath"
Expand Down Expand Up @@ -65,7 +66,8 @@ func From(fsys fs.FS, useCaseSensitiveFileNames bool) vfs.FS {
// \xEF\xBB\xBF.
content = stringutil.AddUTF8ByteOrderMark(content)
}
return fsys.WriteFile(rest, []byte(content), 0o666)
buf := unsafe.Slice(unsafe.StringData(content), len(content))
return fsys.WriteFile(rest, buf, 0o666)
}
mkdirAll = func(path string) error {
rest, _ := strings.CutPrefix(path, "/")
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