fix(core): Update logic to handle when outDir and rootDir are the same

packages/js/src/plugins/typescript/plugin.ts

@@ -22,6 +22,7 @@ import { existsSync, readdirSync, statSync } from 'node:fs';
 import {
   basename,
   dirname,
+  extname,
   join,
   normalize,
   relative,
@@ -622,25 +623,33 @@ function isValidPackageJsonBuildConfig(
     joinPathFragments(projectRoot, 'package.json')
   );
 
+  const rootDir = tsConfig.options.rootDir ?? 'src';
+  const resolvedRootDir = resolve(workspaceRoot, projectRoot, rootDir);
+
   const outDir = tsConfig.options.outDir
     ? tsConfig.options.outDir
     : tsConfig.options.outFile
     ? dirname(tsConfig.options.outFile)
     : false;
 
   const isPathSourceFile = (path: string): boolean => {
+    const ext = extname(path);
     if (!outDir) {
       // If `outDir` is not defined either from tsconfig.json or outFile the transpiled files will be in the same directory as the source files.
       // In this case, we assume that the source files are `.ts`, `.cts`, or `.mts`.
-      return (
-        path.endsWith('.ts') || path.endsWith('.cts') || path.endsWith('.mts')
-      );
+      // TODO: check/handle if the project is `.js` only
+      return ['.ts', '.cts', '.mts'].includes(ext);
     }
 
     const resolvedOutDir = resolve(workspaceRoot, projectRoot, outDir);
     const pathToCheck = resolve(workspaceRoot, projectRoot, path);
 
-    return !pathToCheck.startsWith(resolvedOutDir);
+    // If path is outside of the outDir, if the outDir and the root dir is same check the file type.
+    return (
+      !pathToCheck.startsWith(resolvedOutDir) ||
+      (pathToCheck.startsWith(resolvedRootDir) &&
+        ['.ts', '.cts', '.mts'].includes(ext))
+    );
   };
 
   // If `outFile` is defined, check the validity of the path.