fix(@inquirer/testing): resolve xterm CJS named export error under native Node ESM

@xterm/headless v6 is CJS-only; importing via named ESM syntax fails
under Node's native loader. Switch to default import + property access.

Also update relative imports in testing/src to use .ts extensions,
aligning with the monorepo's allowImportingTsExtensions convention and
allowing Node 24 to load the source natively in ESM integration tests.

Add a regression test in integration/esm to catch this in future.

Author: SBoudrias

integration/esm/integration.test.mjs

@@ -8,6 +8,7 @@ import { input } from '@inquirer/prompts';
 import defaultInput from '@inquirer/input';
 import { createPrompt } from '@inquirer/core';
 import inquirer, { createPromptModule } from 'inquirer';
+import { render } from '@inquirer/testing';
 import fixturePrompt from './fixturePrompt.mjs';
 
 const exec = promisify(child_process.exec);
@@ -25,6 +26,10 @@ describe('ESM Integration', () => {
     assert.ok(typeof createPrompt === 'function');
   });
 
+  it('@inquirer/testing render should be exported', () => {
+    assert.ok(typeof render === 'function');
+  });
+
   it('works when prompt throws an error', async () => {
     await assert.rejects(() => fixturePrompt({}), {
       message: `Prompt functions must return a string.\n    at file://${path.join(import.meta.dirname, './fixturePrompt.mjs')}`,

integration/esm/package.json

@@ -11,6 +11,7 @@
     "@inquirer/core": "workspace:*",
     "@inquirer/input": "workspace:*",
     "@inquirer/prompts": "workspace:*",
+    "@inquirer/testing": "workspace:*",
     "inquirer": "workspace:*"
   },
   "engines": {

packages/testing/src/index.ts

@@ -3,8 +3,8 @@ import MuteStream from 'mute-stream';
 import type { Prompt, Context } from '@inquirer/type';
 
 type RenderOptions = Omit<Context, 'input' | 'output'>;
-import { BufferedStream } from './buffered-stream.js';
-import { interpretTerminalOutput } from './terminal.js';
+import { BufferedStream } from './buffered-stream.ts';
+import { interpretTerminalOutput } from './terminal.ts';
 
 export async function render<Value, const Config>(
   prompt: Prompt<Value, Config>,

packages/testing/src/jest.ts

@@ -2,7 +2,7 @@
 // Note: Jest's requireActual returns `any` by design, unlike Vitest's typed importOriginal
 
 import type { Prompt } from '@inquirer/type';
-import { Screen } from './screen.js';
+import { Screen } from './screen.ts';
 
 // Global screen instance - exported for tests
 const screenInstance: Screen = new Screen();

packages/testing/src/screen.ts

@@ -1,7 +1,7 @@
 import { stripVTControlCharacters } from 'node:util';
 import MuteStream from 'mute-stream';
-import { BufferedStream } from './buffered-stream.js';
-import { interpretTerminalOutput } from './terminal.js';
+import { BufferedStream } from './buffered-stream.ts';
+import { interpretTerminalOutput } from './terminal.ts';
 
 export type KeypressEvent = {
   name?: string;

packages/testing/src/terminal.ts

@@ -1,11 +1,11 @@
-import { Terminal } from '@xterm/headless';
+import xterm from '@xterm/headless';
 
 export async function interpretTerminalOutput(
   rawOutput: string,
   cols: number = 10_000,
   rows: number = 4000,
 ): Promise<string> {
-  const term = new Terminal({ cols, rows, allowProposedApi: true, convertEol: true });
+  const term = new xterm.Terminal({ cols, rows, allowProposedApi: true, convertEol: true });
   await new Promise<void>((resolve) => term.write(rawOutput, resolve));
 
   const lines: string[] = [];

packages/testing/src/vitest.ts

@@ -1,6 +1,6 @@
 import { vi, beforeEach } from 'vitest';
 import type { Prompt } from '@inquirer/type';
-import { Screen } from './screen.js';
+import { Screen } from './screen.ts';
 
 // Global screen instance - exported for tests
 const screenInstance: Screen = new Screen();

yarn.lock

@@ -580,6 +580,7 @@ __metadata:
     "@inquirer/core": "workspace:*"
     "@inquirer/input": "workspace:*"
     "@inquirer/prompts": "workspace:*"
+    "@inquirer/testing": "workspace:*"
     inquirer: "workspace:*"
   languageName: unknown
   linkType: soft