Installed NPM package(s) check

README.md

@@ -82,6 +82,12 @@ class AppServiceProvider extends ServiceProvider
 }
 ```
 
+You can now run the checks using the `ok:check` Artisan command:
+
+```bash
+php artisan ok:check
+```
+
 ## Available checks
 
 ✅ **Cache Check**: Check if reading and writing to the cache is possible.
@@ -102,6 +108,8 @@ class AppServiceProvider extends ServiceProvider
 
 ✅ **NPM Audit Check**: Checks if there are any security vulnerabilities in your npm dependencies.
 
+✅ **NPM Installed Package Check**: Checks if a certain npm package is installed.
+
 ✅ **Queue Check**: Checks if the queue is running.
 
 ✅ **Route Cache Check**: Checks if routes are cached.

src/Checks/NpmPackageInstalledCheck.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Vormkracht10\LaravelOK\Checks;
+
+use Symfony\Component\Process\Process;
+use Vormkracht10\LaravelOK\Checks\Base\Check;
+use Vormkracht10\LaravelOK\Checks\Base\Result;
+
+class NpmPackageInstalledCheck extends Check
+{
+    protected array $shouldHave = [];
+
+    protected array $with = [];
+
+    public function shouldHave(array $packages): self
+    {
+        $this->shouldHave = $packages;
+
+        return $this;
+    }
+
+    public function with(array $data): self
+    {
+        $this->with = $data;
+
+        return $this;
+    }
+
+    public function run(): Result
+    {
+        $result = Result::new();
+
+        $installedPackages = $this->data();
+
+        $missingPackages = array_diff($this->shouldHave, array_keys($installedPackages));
+
+        if (count($missingPackages) === 0) {
+            return $result->ok();
+        }
+
+        $missingPackages = implode(', ', $missingPackages);
+
+        return $result->failed("The following packages are missing: {$missingPackages}");
+    }
+
+    protected function data()
+    {
+        if (count($this->with) > 0) {
+            return $this->with['dependencies'];
+        }
+
+        $process = new Process(['npm', 'list', '--depth=0', '--json']);
+        $process->run();
+
+        $output = $process->getOutput();
+
+        $json = json_decode($output, true);
+
+        return $json['dependencies'];
+    }
+}

tests/Checks/NpmPackageInstalledCheckTest.php

@@ -0,0 +1,39 @@
+<?php
+
+use Vormkracht10\LaravelOK\Checks\Base\Result;
+use Vormkracht10\LaravelOK\Checks\NpmPackageInstalledCheck;
+use Vormkracht10\LaravelOK\Enums\Status;
+
+it('returns ok if all packages are installed', function () {
+    $check = new NpmPackageInstalledCheck();
+    $check->shouldHave(['lodash', 'axios']);
+
+    $installedPackages = [
+        'dependencies' => [
+            'lodash' => '1.2.3',
+            'axios' => '4.5.6',
+        ],
+    ];
+
+    $result = $check->with($installedPackages)->run();
+
+    expect($result)->toBeInstanceOf(Result::class)
+        ->status->toBe(Status::OK);
+});
+
+it('returns failed if some packages are missing', function () {
+    $check = new NpmPackageInstalledCheck();
+    $check->shouldHave(['lodash', 'axios']);
+
+    $installedPackages = [
+        'dependencies' => [
+            'lodash' => '1.2.3',
+        ],
+    ];
+
+    $result = $check->with($installedPackages)->run();
+
+    expect($result)->toBeInstanceOf(Result::class)
+        ->status->toBe(Status::FAILED)
+        ->getMessage()->toBe('The following packages are missing: axios');
+});