first upload all files

Modules/Compare/Compare.php

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+<?php
+
+namespace Modules\Compare;
+
+use JsonSerializable;
+use Modules\Product\Entities\Product;
+use Darryldecode\Cart\Cart as DarryldecodeCart;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+
+class Compare extends DarryldecodeCart implements JsonSerializable
+{
+    public function store($productId)
+    {
+        $product = Product::with('files', 'attributes.attribute')
+            ->with('reviews')
+            ->withCount('options')
+            ->findOrFail($productId);
+
+        return $this->add([
+            'id' => $product->id,
+            'name' => $product->name,
+            'price' => $product->price->amount(),
+            'quantity' => 1,
+            'attributes' => compact('product'),
+        ]);
+    }
+
+    public function hasAnyProduct()
+    {
+        return $this->products()->isNotEmpty();
+    }
+
+    public function count()
+    {
+        return $this->products()->count();
+    }
+
+    public function products()
+    {
+        return $this->getContent()->map(function ($item) {
+            return $item->attributes->product;
+        });
+    }
+
+    public function attributes()
+    {
+        return $this->products()->flatMap->attributes->unique('name');
+    }
+
+    public function relatedProducts()
+    {
+        return $this->products()->load(['relatedProducts' => function ($query) {
+            $query->forCard();
+        }])->pluck('relatedProducts')->flatten();
+    }
+
+    public function list()
+    {
+        return $this->products()->pluck('id');
+    }
+
+    public function getContent()
+    {
+        return new EloquentCollection($this->session->get($this->sessionKeyCartItems));
+    }
+
+    public function jsonSerialize()
+    {
+        return [
+            'products' => $this->products(),
+            'attributes' => $this->attributes(),
+        ];
+    }
+
+    public function __toString()
+    {
+        return json_encode($this->jsonSerialize());
+    }
+}

Modules/Compare/Config/config.php

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+<?php
+
+return [
+    /*
+     * ---------------------------------------------------------------
+     * formatting
+     * ---------------------------------------------------------------
+     *
+     * the formatting of shopping cart values
+     */
+    'format_numbers' => env('SHOPPING_FORMAT_VALUES', false),
+
+    'decimals' => env('SHOPPING_DECIMALS', 0),
+
+    'dec_point' => env('SHOPPING_DEC_POINT', '.'),
+
+    'thousands_sep' => env('SHOPPING_THOUSANDS_SEP', ','),
+
+    /*
+     * ---------------------------------------------------------------
+     * persistence
+     * ---------------------------------------------------------------
+     *
+     * the configuration for persisting cart
+     */
+    'storage' => null,
+
+    /*
+     * ---------------------------------------------------------------
+     * events
+     * ---------------------------------------------------------------
+     *
+     * the configuration for cart events
+     */
+    'events' => null,
+];

Modules/Compare/Http/Controllers/CompareController.php

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+<?php
+
+namespace Modules\Compare\Http\Controllers;
+
+use Modules\Compare\Compare;
+
+class CompareController
+{
+    /**
+     * Display a listing of the resource.
+     *
+     * @param \Modules\Compare\Compare $compare
+     * @return \Illuminate\Http\Response
+     */
+    public function index(Compare $compare)
+    {
+        return view('public.compare.index', compact('compare'));
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param \Modules\Compare\Compare $compare
+     * @return \Illuminate\Http\Response
+     */
+    public function store(Compare $compare)
+    {
+        $compare->store(request('productId'));
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     *
+     * @param int $productId
+     * @param \Modules\Compare\Compare $compare
+     * @return \Illuminate\Http\Response
+     */
+    public function destroy($productId, Compare $compare)
+    {
+        $compare->remove($productId);
+    }
+}

Modules/Compare/Http/Controllers/CompareRelatedProductController.php

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+<?php
+
+namespace Modules\Compare\Http\Controllers;
+
+use Modules\Compare\Compare;
+
+class CompareRelatedProductController
+{
+    /**
+     * Display a listing of the resource.
+     *
+     * @param \Modules\Compare\Compare $compare
+     * @return \Illuminate\Http\Response
+     */
+    public function index(Compare $compare)
+    {
+        return $compare->relatedProducts();
+    }
+}

Modules/Compare/Providers/CompareServiceProvider.php

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+<?php
+
+namespace Modules\Compare\Providers;
+
+use Modules\Compare\Compare;
+use Illuminate\Support\ServiceProvider;
+
+class CompareServiceProvider extends ServiceProvider
+{
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        $this->app->singleton(Compare::class, function ($app) {
+            return new Compare(
+                $app['session'],
+                $app['events'],
+                'compare',
+                session()->getId() . '_compare',
+                config('fleetcart.modules.compare.config')
+            );
+        });
+
+        $this->app->alias(Compare::class, 'compare');
+    }
+}

Modules/Compare/Routes/public.php

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+<?php
+
+use Illuminate\Support\Facades\Route;
+
+Route::get('compare', 'CompareController@index')->name('compare.index');
+Route::post('compare', 'CompareController@store')->name('compare.store');
+Route::delete('compare/{productId}', 'CompareController@destroy')->name('compare.destroy');
+
+Route::get('compare/related-products', 'CompareRelatedProductController@index')->name('compare.related_products.index');

Modules/Compare/composer.json

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+{
+    "name": "fleetcart/compare",
+    "description": "The FleetCart Compare Module.",
+    "authors": [
+        {
+            "name": "Envay Soft",
+            "email": "envaysoft@gmail.com"
+        }
+    ],
+    "require": {
+        "php": "^8.0.2",
+        "darryldecode/cart": "^4.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "Modules\\Compare\\": ""
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.0.x-dev"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "minimum-stability": "dev"
+}

Modules/Compare/module.json

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+{
+    "name": "Compare",
+    "alias": "compare",
+    "description": "The FleetCart Compare Module.",
+    "priority": 100,
+    "providers": [
+        "Modules\\Compare\\Providers\\CompareServiceProvider"
+    ]
+}