factor out isJsxOrTsxExtension

Author: Andy Hanson

src/compiler/core.ts

@@ -861,6 +861,10 @@ namespace ts {
         return fileExtensionIs(path, extension) ? path.substring(0, path.length - extension.length) : undefined;
     }
 
+    export function isJsxOrTsxExtension(ext: string): boolean {
+        return ext === ".jsx" || ext === ".tsx";
+    }
+
     export interface ObjectAllocator {
         getNodeConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => Node;
         getSourceFileConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => SourceFile;

src/compiler/program.ts

@@ -646,7 +646,7 @@ namespace ts {
         return forEach(extensions, tryLoad);
 
         function tryLoad(ext: string): string {
-            if (state.skipTsx && (ext === ".jsx" || ext === ".tsx")) {
+            if (state.skipTsx && isJsxOrTsxExtension(ext)) {
                 return undefined;
             }
             const fileName = fileExtensionIs(candidate, ext) ? candidate : candidate + ext;