fix(vite): tsconfig paths plugin should resolve file extensions (#27774)

This PR updates the tsconfig paths plugin for Vite such that it resolves
paths with file extensions as well.

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## Current Behavior
<!-- This is the behavior we have today -->

## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
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## Related Issue(s)
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Fixes #22868

e2e/vite/src/vite.test.ts

@@ -7,6 +7,7 @@ import {
   runCommandUntil,
   uniq,
   updateFile,
+  updateJson,
 } from '@nx/e2e/utils';
 import { ChildProcess } from 'child_process';
 import { names } from '@nx/devkit';
@@ -158,6 +159,32 @@ describe('@nx/vite/plugin', () => {
         await killProcessAndPorts(process.pid, port);
       }
     });
+
+    it('should support importing .js and .css files in tsconfig path', () => {
+      const mylib = uniq('mylib');
+      runCLI(
+        `generate @nx/react:library ${mylib} --bundler=none --unitTestRunner=vitest --directory=libs/${mylib} --project-name-and-root-format=as-provided`
+      );
+      updateFile(`libs/${mylib}/src/styles.css`, `.foo {}`);
+      updateFile(`libs/${mylib}/src/foo.mts`, `export const foo = 'foo';`);
+      updateFile(
+        `libs/${mylib}/src/foo.spec.ts`,
+        `
+          import styles from '~/styles.css?inline';
+          import { foo } from '~/foo.mjs';
+          test('should work', () => {
+            expect(styles).toBeDefined();
+            expect(foo).toBeDefined();
+          });
+        `
+      );
+      updateJson('tsconfig.base.json', (json) => {
+        json.compilerOptions.paths['~/*'] = [`libs/${mylib}/src/*`];
+        return json;
+      });
+
+      expect(() => runCLI(`test ${mylib}`)).not.toThrow();
+    });
   });
 
   describe('react with vitest only', () => {

packages/vite/plugins/nx-tsconfig-paths.plugin.ts

@@ -5,7 +5,7 @@ import {
   workspaceRoot,
 } from '@nx/devkit';
 import { copyFileSync, existsSync } from 'node:fs';
-import { relative, join, resolve } from 'node:path';
+import { join, parse, relative, resolve } from 'node:path';
 import {
   loadConfig,
   createMatchPath,
@@ -57,8 +57,13 @@ export function nxViteTsPaths(options: nxViteTsPathsOptions = {}) {
     '.js',
     '.jsx',
     '.json',
+    '.mts',
     '.mjs',
+    '.cts',
     '.cjs',
+    '.css',
+    '.scss',
+    '.less',
   ];
   options.mainFields ??= [['exports', '.', 'import'], 'module', 'main'];
   options.buildLibsFromSource ??= true;
@@ -246,7 +251,9 @@ There should at least be a tsconfig.base.json or tsconfig.json in the root of th
 
   function findFile(path: string): string {
     for (const ext of options.extensions) {
-      const resolvedPath = resolve(path + ext);
+      // Support file extensions such as .css and .js in the import path.
+      const { dir, name } = parse(path);
+      const resolvedPath = resolve(dir, name + ext);
       if (existsSync(resolvedPath)) {
         return resolvedPath;
       }