chore(tailwind): Improve code for running Tailwind integration test

.gitignore

@@ -7,6 +7,7 @@ node_modules
 
 # testing
 coverage
+package-lock.json
 
 # next.js
 .next/

packages/tailwind/integrations/integrations.spec.ts

@@ -0,0 +1,40 @@
+import path from 'node:path';
+import shell from 'shelljs';
+
+const $ = (command: string, cwd: string = path.resolve(__dirname, '..')) => {
+  const executionResult = shell.exec(command, {
+    cwd,
+    fatal: true,
+    silent: true,
+  });
+  if (executionResult.code !== 0) {
+    process.stdout.write(executionResult.stderr);
+    process.stderr.write(executionResult.stderr);
+  }
+  expect(
+    executionResult.code,
+    `Expected command "${command}" to work properly but it returned a non-zero exit code`,
+  ).toBe(0);
+};
+
+describe('integrations', () => {
+  beforeAll(() => {
+    const packageLocation = path.resolve(__dirname, '../');
+    $('yalc installations clean @react-email/tailwind', packageLocation);
+    $('yalc publish', packageLocation);
+  });
+
+  const integrationsLocation = __dirname;
+
+  test("Tailwind works on the Next App's build process", () => {
+    const nextAppLocation = path.resolve(integrationsLocation, 'nextjs');
+    $('npm install', nextAppLocation);
+    $('npm run build', nextAppLocation);
+  });
+
+  test("Tailwind works on the Vite App's build process", () => {
+    const viteAppLocation = path.resolve(integrationsLocation, 'vite');
+    $('npm install', viteAppLocation);
+    $('npm run build', viteAppLocation);
+  });
+});

packages/tailwind/integrations/nextjs/next-env.d.ts

@@ -2,4 +2,4 @@
 /// <reference types="next/image-types/global" />
 
 // NOTE: This file should not be edited
-// see https://nextjs.org/docs/app/building-your-application/configuring/typescript for more information.
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.