regression(38485): allow using rawText property in processing a tagged template

src/testRunner/unittests/transform.ts

@@ -50,6 +50,15 @@ namespace ts {
             return (node: SourceFile) => visitNode(node, visitor);
         }
 
+        function createTaggedTemplateLiteral(): Transformer<SourceFile> {
+            return sourceFile => updateSourceFileNode(sourceFile, [
+                createStatement(
+                    createTaggedTemplate(
+                        createIdentifier("$tpl"),
+                        createNoSubstitutionTemplateLiteral("foo", "foo")))
+            ]);
+        }
+
         function transformSourceFile(sourceText: string, transformers: TransformerFactory<SourceFile>[]) {
             const transformed = transform(createSourceFile("source.ts", sourceText, ScriptTarget.ES2015), transformers);
             const printer = createPrinter({ newLine: NewLineKind.CarriageReturnLineFeed }, {
@@ -120,6 +129,17 @@ namespace ts {
             }).outputText;
         });
 
+        testBaseline("transformTaggedTemplateLiteral", () => {
+            return transpileModule("", {
+                transformers: {
+                    before: [createTaggedTemplateLiteral],
+                },
+                compilerOptions: {
+                    target: ScriptTarget.ES5
+                }
+            }).outputText;
+        });
+
         testBaseline("issue27854", () => {
             return transpileModule(`oldName<{ a: string; }>\` ... \`;`, {
                 transformers: {