vendor tsgo

tools/tsgo/internal/transformers/tstransforms/utilities.go

@@ -0,0 +1,29 @@
+package tstransforms
+
+import (
+	"github.com/microsoft/typescript-go/internal/ast"
+	"github.com/microsoft/typescript-go/internal/jsnum"
+	"github.com/microsoft/typescript-go/internal/printer"
+)
+
+func constantExpression(value any, factory *printer.NodeFactory) *ast.Expression {
+	switch value := value.(type) {
+	case string:
+		return factory.NewStringLiteral(value, ast.TokenFlagsNone)
+	case jsnum.Number:
+		if value.IsInf() {
+			if value > 0 {
+				return factory.NewIdentifier("Infinity")
+			}
+			return factory.NewPrefixUnaryExpression(ast.KindMinusToken, factory.NewIdentifier("Infinity"))
+		}
+		if value.IsNaN() {
+			return factory.NewIdentifier("NaN")
+		}
+		if value < 0 {
+			return factory.NewPrefixUnaryExpression(ast.KindMinusToken, constantExpression(-value, factory))
+		}
+		return factory.NewNumericLiteral(value.String(), ast.TokenFlagsNone)
+	}
+	return nil
+}