test: assert for typescript template dependencies

test/integration/create-next-app/index.test.js

@@ -97,9 +97,9 @@ describe('create next app', () => {
       const res = await run([projectName, '--typescript'], { cwd })
       expect(res.exitCode).toBe(0)
 
-      expect(
-        fs.existsSync(path.join(cwd, projectName, 'package.json'))
-      ).toBeTruthy()
+      const pkgJSONPath = path.join(cwd, projectName, 'package.json')
+
+      expect(fs.existsSync(pkgJSONPath)).toBeTruthy()
       expect(
         fs.existsSync(path.join(cwd, projectName, 'pages/index.tsx'))
       ).toBeTruthy()
@@ -119,6 +119,14 @@ describe('create next app', () => {
       expect(
         fs.existsSync(path.join(cwd, projectName, '.gitignore'))
       ).toBeTruthy()
+
+      // Assert for dependencies specific to the typescript template
+      const dependencies = ['next', 'react', 'react-dom']
+      const devDependencies = ['@types/react', 'typescript']
+
+      const pkgJSON = require(pkgJSONPath)
+      expect(Object.keys(pkgJSON.dependencies)).toEqual(dependencies)
+      expect(Object.keys(pkgJSON.devDependencies)).toEqual(devDependencies)
     })
   })