add type alias for line starts

Author: gabritto

internal/core/core.go

@@ -362,7 +362,9 @@ func Coalesce[T *U, U any](a T, b T) T {
 	}
 }
 
-func ComputeECMALineStarts(text string) []TextPos {
+type ECMALineStarts []TextPos
+
+func ComputeECMALineStarts(text string) ECMALineStarts {
 	result := make([]TextPos, 0, strings.Count(text, "\n")+1)
 	return slices.AppendSeq(result, ComputeECMALineStartsSeq(text))
 }

internal/ls/linemap.go

@@ -9,6 +9,8 @@ import (
 	"github.com/microsoft/typescript-go/internal/core"
 )
 
+type LSPLineStarts []core.TextPos
+
 type LSPLineMap struct {
 	LineStarts []core.TextPos
 	AsciiOnly  bool // TODO(jakebailey): collect ascii-only info per line

internal/sourcemap/lineinfo.go

@@ -4,10 +4,10 @@ import "github.com/microsoft/typescript-go/internal/core"
 
 type ECMALineInfo struct {
 	text       string
-	lineStarts []core.TextPos
+	lineStarts core.ECMALineStarts
 }
 
-func CreateECMALineInfo(text string, lineStarts []core.TextPos) *ECMALineInfo {
+func CreateECMALineInfo(text string, lineStarts core.ECMALineStarts) *ECMALineInfo {
 	return &ECMALineInfo{
 		text:       text,
 		lineStarts: lineStarts,