emit private names for esnext

Author: Max Heiber

src/compiler/emitter.ts

@@ -603,6 +603,10 @@ namespace ts {
                     case SyntaxKind.Identifier:
                         return emitIdentifier(<Identifier>node);
 
+                    // PrivateNames
+                    case SyntaxKind.PrivateName:
+                        return emitPrivateName(node as PrivateName);
+
                     // Parse tree nodes
 
                     // Names
@@ -872,6 +876,10 @@ namespace ts {
                     case SyntaxKind.Identifier:
                         return emitIdentifier(<Identifier>node);
 
+                    // Private Names
+                    case SyntaxKind.PrivateName:
+                        return emitPrivateName(node as PrivateName);
+
                     // Reserved words
                     case SyntaxKind.FalseKeyword:
                     case SyntaxKind.NullKeyword:
@@ -1061,6 +1069,12 @@ namespace ts {
             emitList(node, node.typeArguments, ListFormat.TypeParameters); // Call emitList directly since it could be an array of TypeParameterDeclarations _or_ type arguments
         }
 
+        function emitPrivateName(node: PrivateName) {
+            const writeText = node.symbol ? writeSymbol : write;
+            writeText(getTextOfNode(node, /*includeTrivia*/ false), node.symbol);
+            emitList(node, /*typeArguments*/undefined, ListFormat.TypeParameters); // Call emitList directly since it could be an array of TypeParameterDeclarations _or_ type arguments
+        }
+
         //
         // Names
         //

src/compiler/factory.ts

@@ -138,6 +138,10 @@ namespace ts {
         : node;
     }
 
+    export function updatePrivateName(node: PrivateName): PrivateName {
+        return node;
+    };
+
     let nextAutoGenerateId = 0;
 
     /** Create a unique temporary variable. */

src/compiler/visitor.ts

@@ -221,6 +221,8 @@ namespace ts {
 
             case SyntaxKind.Identifier:
                 return updateIdentifier(<Identifier>node, nodesVisitor((<Identifier>node).typeArguments, visitor, isTypeNodeOrTypeParameterDeclaration));
+            case SyntaxKind.PrivateName:
+                return updatePrivateName(node as PrivateName);
 
             case SyntaxKind.QualifiedName:
                 return updateQualifiedName(<QualifiedName>node,