What is the reason Class not found?

Question

Composer

Good afternoon! Installed the Laravel project, created a library folder in the root of the project, added a few classes. Then I try to use them, but the classes that are there are not there.

Class "library\Repositories\EloquentRepository" not found

What could be the problem? How can this be fixed?

Part of a class

<?php

namespace library\Repositories;

use library\Repositories\Contracts\Repository;
use ArrayAccess;
use Countable;
use IteratorAggregate;
use library\interfaces\Arrayable;

abstract class EloquentRepository extends BaseRepository implements Repository, Arrayable, ArrayAccess, Countable, \Iterator

default composer.json

{
    "name": "laravel/laravel",
    "type": "project",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "require": {
        "php": "^8.0.2",
        "fruitcake/laravel-cors": "^2.0.5",
        "guzzlehttp/guzzle": "^7.2",
        "laravel/framework": "^9.0",
        "laravel/sanctum": "^2.14",
        "laravel/tinker": "^2.7",
        "ext-iconv": "*",
        "ext-simplexml": "*"
    },
    "require-dev": {
        "fakerphp/faker": "^1.9.1",
        "laravel/sail": "^1.0.1",
        "mockery/mockery": "^1.4.4",
        "nunomaduro/collision": "^6.1",
        "phpunit/phpunit": "^9.5.10",
        "spatie/laravel-ignition": "^1.0"
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/",
            "Database\\Factories\\": "database/factories/",
            "Database\\Seeders\\": "database/seeders/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "scripts": {
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover --ansi"
        ],
        "post-update-cmd": [
            "@php artisan vendor:publish --tag=laravel-assets --ansi --force"
        ],
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate --ansi"
        ]
    },
    "extra": {
        "laravel": {
            "dont-discover": []
        }
    },
    "config": {
        "optimize-autoloader": true,
        "preferred-install": "dist",
        "sort-packages": true
    },
    "minimum-stability": "dev",
    "prefer-stable": true
}

Answer 1

What could be the problem?

And it's like with an engine in a car - either there is nothing to burn or nothing to set fire to. Therefore, either the path is not correct or there is no class as such.