Properly classify output text in emitter

ahejlsberg · ahejlsberg · commit 4ae8445ff7a7 · 2018-02-03T11:32:24.000-08:00
diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
@@ -1196,16 +1196,23 @@ namespace ts {
 
         function emitConditionalType(node: ConditionalTypeNode) {
             emit(node.checkType);
-            write(" extends ");
+            writeSpace();
+            writeKeyword("extends");
+            writeSpace();
             emit(node.extendsType);
-            write(" ? ");
+            writeSpace();
+            writePunctuation("?");
+            writeSpace();
             emit(node.trueType);
-            write(" : ");
+            writeSpace();
+            writePunctuation(":");
+            writeSpace();
             emit(node.falseType);
         }
 
         function emitInferType(node: InferTypeNode) {
-            write("infer ");
+            writeKeyword("infer");
+            writeSpace();
             emit(node.typeParameter);
         }
 
