don't rewrite explicit .cjs/.mjs extensions

Author: stainless-em

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tsc-multi",
-  "version": "1.1.8",
+  "version": "1.1.9",
   "description": "Compile multiple TypeScript projects into multiple targets.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/transformer.ts

@@ -4,6 +4,8 @@ import { trimSuffix } from "./utils";
 import assert from "assert";
 
 const JS_EXT = ".js";
+const MJS_EXT = ".mjs";
+const CJS_EXT = ".cjs";
 const JSON_EXT = ".json";
 
 function isRelativePath(path: string): boolean {
@@ -70,6 +72,10 @@ export function createTransformer<T extends ts.SourceFile | ts.Bundle>(
 
     const ext = extname(node.text);
 
+    if (ext === MJS_EXT || ext === CJS_EXT) {
+      return node;
+    }
+
     if (ext === JSON_EXT && ctx.getCompilerOptions().resolveJsonModule) {
       return node;
     }