feat: add welcome message and update check on no arguments in CLI

src/cli.ts

@@ -20,6 +20,7 @@ import { updateCommand } from './commands/update';
 import { webhooksCommand } from './commands/webhooks/index';
 import { whoamiCommand } from './commands/whoami';
 import { setupCliExitHandler } from './lib/cli-exit';
+import { printBannerPlain } from './lib/logo';
 import { errorMessage, outputError } from './lib/output';
 import { trackCommand } from './lib/telemetry';
 import { checkForUpdates } from './lib/update-check';
@@ -116,6 +117,9 @@ ${pc.gray('Examples:')}
 `,
   )
   .action(() => {
+    if (process.stdout.isTTY) {
+      printBannerPlain();
+    }
     const opts = program.opts();
     if (opts.apiKey) {
       outputError(

src/lib/logo.ts

@@ -0,0 +1,16 @@
+const LOGO_LINES = [
+  '  ██████╗ ███████╗███████╗███████╗███╗   ██╗██████╗ ',
+  '  ██╔══██╗██╔════╝██╔════╝██╔════╝████╗  ██║██╔══██╗',
+  '  ██████╔╝█████╗  ███████╗█████╗  ██╔██╗ ██║██║  ██║',
+  '  ██╔══██╗██╔══╝  ╚════██║██╔══╝  ██║╚██╗██║██║  ██║',
+  '  ██║  ██║███████╗███████║███████╗██║ ╚████║██████╔╝',
+  '  ╚═╝  ╚═╝╚══════╝╚══════╝╚══════╝╚═╝  ╚═══╝╚═════╝ ',
+];
+
+export function printBannerPlain(): void {
+  process.stdout.write('\n');
+  for (const line of LOGO_LINES) {
+    process.stdout.write(`${line}\n`);
+  }
+  process.stdout.write('\n');
+}

tests/lib/logo.test.ts

@@ -0,0 +1,37 @@
+import {
+  afterEach,
+  describe,
+  expect,
+  type MockInstance,
+  test,
+  vi,
+} from 'vitest';
+import { printBannerPlain } from '../../src/lib/logo';
+
+describe('printBannerPlain', () => {
+  let writeSpy: MockInstance;
+
+  afterEach(() => {
+    writeSpy?.mockRestore();
+  });
+
+  test('writes ASCII logo to stdout', () => {
+    const chunks: string[] = [];
+    writeSpy = vi
+      .spyOn(process.stdout, 'write')
+      .mockImplementation((chunk: unknown) => {
+        chunks.push(
+          typeof chunk === 'string'
+            ? chunk
+            : new TextDecoder().decode(chunk as Uint8Array),
+        );
+        return true;
+      });
+
+    printBannerPlain();
+
+    const out = chunks.join('');
+    expect(out).toContain('██████╗');
+    expect(out).toContain('█');
+  });
+});

tests/welcome.test.ts

@@ -0,0 +1,35 @@
+import { type ExecFileSyncOptions, execFileSync } from 'node:child_process';
+import { resolve } from 'node:path';
+import { describe, expect, test } from 'vitest';
+
+const CLI = resolve(import.meta.dirname, '../src/cli.ts');
+
+const noUpdateEnv = {
+  ...process.env,
+  RESEND_NO_UPDATE_NOTIFIER: '1',
+  NO_COLOR: '1',
+};
+
+describe('no-args welcome', () => {
+  test('exits 0 and shows help when invoked with no arguments', () => {
+    const execOptions: ExecFileSyncOptions = {
+      encoding: 'utf-8',
+      timeout: 10_000,
+      env: noUpdateEnv,
+      ...(process.platform === 'win32' ? { shell: true } : {}),
+    };
+    const stdout = execFileSync('npx', ['tsx', CLI], execOptions) as string;
+    expect(stdout).toContain('Usage: resend');
+  });
+
+  test('skips banner when stdout is not a TTY', () => {
+    const execOptions: ExecFileSyncOptions = {
+      encoding: 'utf-8',
+      timeout: 10_000,
+      env: noUpdateEnv,
+      ...(process.platform === 'win32' ? { shell: true } : {}),
+    };
+    const stdout = execFileSync('npx', ['tsx', CLI], execOptions) as string;
+    expect(stdout).not.toContain('██████╗');
+  });
+});