fix: resolve tsconfig path aliases containing a colon

src/esm/hook/resolve.ts

@@ -15,6 +15,7 @@ import {
 	tsExtensionsPattern,
 	isDirectoryPattern,
 	isRelativePath,
+	isFilePath,
 } from '../../utils/path-utils.js';
 import type { TsxRequest } from '../types.js';
 import { logEsm as log, debugEnabled } from '../../utils/debug.js';
@@ -252,8 +253,9 @@ const resolveTsPaths: ResolveHook = async (
 		fromNodeModules: context.parentURL?.includes('/node_modules/'),
 	});
 	if (
-		// Bare specifier
-		!requestAcceptsQuery(specifier)
+		// Bare specifier or TS path alias (e.g. `ns:foo`) - not a file path or file:// URL
+		!isFilePath(specifier)
+		&& !specifier.startsWith(fileUrlPrefix)
 		// TS path alias
 		&& tsconfigPathsMatcher
 		&& !context.parentURL?.includes('/node_modules/')

tests/specs/tsconfig.ts

@@ -136,6 +136,33 @@ export default testSuite(async ({ describe }, { tsx }: NodeApis) => {
 						expect(pTsconfig.stderr).toBe('');
 						expect(pTsconfig.stdout).toBe('');
 					});
+
+					test('tsconfig paths with colon in alias name', async ({ onTestFail }) => {
+						await using fixture = await createFixture({
+							'package.json': createPackageJson(packageType ? { type: packageType } : {}),
+							'tsconfig.json': createTsconfig({
+								compilerOptions: {
+									baseUrl: '.',
+									paths: {
+										'ns:*': ['./src/*'],
+									},
+								},
+							}),
+							'src/utils.ts': `export const value = 'success'`,
+							'index.ts': `
+							import { value } from 'ns:utils';
+							console.log(value);
+							`,
+						});
+
+						const result = await tsx(['index.ts'], fixture.path);
+						onTestFail((error) => {
+							console.error(error);
+							console.log(result);
+						});
+						expect(result.failed).toBe(false);
+						expect(result.stdout).toBe('success');
+					});
 				});
 
 				describe('custom tsconfig', ({ test }) => {