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perf(tspath): void []byte allocation in ToFileNameLowerCase #1581

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Merged
merged 1 commit into from
Aug 14, 2025
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perf(tspath): void []byte allocation in ToFileNameLowerCase #1581

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9 changes: 6 additions & 3 deletions internal/tspath/path.go
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Original file line number Diff line number Diff line change
Expand Up @@ -583,7 +583,9 @@ func ToFileNameLowerCase(fileName string) string {

ascii := true
needsLower := false
for _, c := range []byte(fileName) {
fileNameLen := len(fileName)
for i := range fileNameLen {
c := fileName[i]
if c >= 0x80 {
ascii = false
break
Expand All @@ -596,8 +598,9 @@ func ToFileNameLowerCase(fileName string) string {
if !needsLower {
return fileName
}
b := make([]byte, len(fileName))
for i, c := range []byte(fileName) {
b := make([]byte, fileNameLen)
for i := range fileNameLen {
c := fileName[i]
if 'A' <= c && c <= 'Z' {
c += 'a' - 'A' // +32
}
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