diff --git a/.github/workflows/code_checks.yaml b/.github/workflows/code_checks.yaml
index bae4b5faef..a5c829ffbb 100644
--- a/.github/workflows/code_checks.yaml
+++ b/.github/workflows/code_checks.yaml
@@ -73,7 +73,6 @@ jobs:
                 name: Run
                 run: composer rector
 
-
     binary_files:
         runs-on: ubuntu-latest
 
diff --git a/.github/workflows/ecs_prefixed.yaml b/.github/workflows/ecs_prefixed.yaml
new file mode 100644
index 0000000000..2390e6d488
--- /dev/null
+++ b/.github/workflows/ecs_prefixed.yaml
@@ -0,0 +1,83 @@
+name: Prefixed ECS Deploy
+
+on:
+    pull_request: null
+    push:
+        branches:
+            - master
+
+jobs:
+    ecs_phar_compile:
+        runs-on: ubuntu-latest
+
+        steps:
+            -
+                name: Checkout code
+                uses: actions/checkout@v2
+
+            -
+                name: Setup PHP
+                uses: shivammathur/setup-php@v1
+                with:
+                    php-version: 7.2
+                    coverage: none
+
+            -
+                name: Install
+                run:  |
+                    # install
+                    cd packages/EasyCodingStandard/compiler
+                    composer install
+
+            -
+                name: Compile ecs.phar with Box and PHP Scoper
+                run:  |
+                    # compile
+                    cd packages/EasyCodingStandard/compiler
+                    bin/compile
+
+            -
+                name: Run ecs.phar
+                run:  |
+                    # remove local vendor, to prevent duplicated content
+                    rm -rf packages/EasyCodingStandard/vendor
+                    cd packages/EasyCodingStandard
+                    tmp/ecs.phar
+
+            -
+                name: Run ecs.phar with PSR-12 set
+                run:  |
+                    cd packages/EasyCodingStandard
+                    # create dummy file
+                    echo "<?php echo 'hi';" >> someFile.php
+                    tmp/ecs.phar check someFile.php --set dead-code
+
+            # Deploy PHAR to https://github.com/Symplify/EasyCodingStandardPrefixed
+            -
+                name: Publish ecs.phar to Symplify/EasyCodingStandardPrefixed
+                run: |
+                    cd packages/EasyCodingStandard
+
+                    # reuse tmp/ecs.phar from previous job
+                    git clone https://${ACCESS_TOKEN}@github.com/Symplify/EasyCodingStandardPrefixed.git > /dev/null 2>&1
+
+                    # copy phar files inside cloned repository
+                    cp tmp/ecs.phar EasyCodingStandardPrefixed/ecs.phar
+                    cp tmp/ecs.phar EasyCodingStandardPrefixed/ecs
+
+                    # go to clone repository
+                    cd EasyCodingStandardPrefixed
+                    git config user.email "action@github.com"
+                    git config user.name "Github Actions"
+                    git add ecs ecs.phar
+
+                    # commit with new tag, if this commit is tagged, or with normal commit
+                    if [ "${TRAVIS_TAG}" != "" ]; then COMMIT_MSG="ECS ${TRAVIS_TAG}"; else COMMIT_MSG="Updated ECS to commit ${TRAVIS_COMMIT}"; fi
+                    git commit -m "${COMMIT_MSG}"
+
+                    git push --quiet origin master
+
+                    # push tag, if this commit is tagged, or with normal push
+                    if [ "${TRAVIS_TAG}" != "" ]; then git tag "${TRAVIS_TAG}" && git push --quiet origin ${TRAVIS_TAG}; fi
+                env:
+                    ACCESS_TOKEN: ${{ secrets.ACCESS_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 4c7da5d406..ddd9e52c54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,4 +14,5 @@ package-lock.json
 # phpunit
 .phpunit.result.cache
 
-packages/EasyCodingStandard/compiler/
\ No newline at end of file
+packages/EasyCodingStandard/vendor/
+packages/EasyCodingStandard/tmp/
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 846f00a0d8..84cc89c3f6 100644
--- a/composer.json
+++ b/composer.json
@@ -65,6 +65,7 @@
             "Symplify\\EasyCodingStandardTester\\": "packages/EasyCodingStandardTester/src",
             "Symplify\\EasyCodingStandard\\": "packages/EasyCodingStandard/src",
             "Symplify\\EasyCodingStandard\\ChangedFilesDetector\\": "packages/EasyCodingStandard/packages/ChangedFilesDetector/src",
+            "Symplify\\EasyCodingStandard\\Compiler\\": "packages/EasyCodingStandard/compiler/src",
             "Symplify\\EasyCodingStandard\\Configuration\\": "packages/EasyCodingStandard/packages/Configuration/src",
             "Symplify\\EasyCodingStandard\\FixerRunner\\": "packages/EasyCodingStandard/packages/FixerRunner/src",
             "Symplify\\EasyCodingStandard\\SniffRunner\\": "packages/EasyCodingStandard/packages/SniffRunner/src",
diff --git a/configuration- b/configuration-
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/ecs.yaml b/ecs.yaml
index 15baa994dd..5c21d090fb 100644
--- a/ecs.yaml
+++ b/ecs.yaml
@@ -39,6 +39,8 @@ parameters:
         # tests
         - 'packages/*/tests/**Source/*.php'
         - 'packages/CodingStandard/tests/Fixer/Order/MethodOrderByTypeFixer/Wrong/*'
+        # own scope
+        - 'packages/EasyCodingStandard/compiler/build/scoper.inc.php'
 
     skip:
         # run form time to time, very slow and making many changes
diff --git a/packages/EasyCodingStandard/README.md b/packages/EasyCodingStandard/README.md
index 35b6023c64..2e2a741969 100644
--- a/packages/EasyCodingStandard/README.md
+++ b/packages/EasyCodingStandard/README.md
@@ -11,7 +11,7 @@
     <a href="https://github.com/lmc-eu/php-coding-standard"><img src="/docs/logos/lmc.png"></a>
     <img src="/docs/logos/space.png">
     <a href="https://github.com/nette/coding-standard"><img src="/docs/logos/nette.png"></a>
-    <img src="/docs/logos/space.png">
+    <br>
     <a href="https://github.com/shopsys/coding-standards"><img src="/docs/logos/shopsys.png"></a>
     <img src="/docs/logos/space.png">
     <a href="https://github.com/SyliusLabs/CodingStandard"><img src="/docs/logos/sylius.png"></a>
@@ -23,6 +23,7 @@
 - **2nd run under few seconds** with caching
 - [Skipping files](#ignore-what-you-cant-fix) for specific checkers
 - [Prepared checker sets](#use-prepared-checker-sets) - PSR12, Symfony, Common, Symplify and more...
+- Use [Prefixed version](https://github.com/Symplify/EasyCodingStandardPrefixed) to prevent conflicts on install
 
 Are you already using another tool?
 
diff --git a/packages/EasyCodingStandard/bin/ecs b/packages/EasyCodingStandard/bin/ecs
index 39c4a15785..3f841d3f35 100755
--- a/packages/EasyCodingStandard/bin/ecs
+++ b/packages/EasyCodingStandard/bin/ecs
@@ -17,26 +17,11 @@ use Symplify\EasyCodingStandard\Configuration\Configuration;
 gc_disable();
 
 # 1. autoload
-$possibleAutoloadPaths = [
-    // after split package
-    __DIR__ . '/../vendor',
-    // dependency
-    __DIR__ . '/../../..',
-    // monorepo
-    __DIR__ . '/../../../vendor',
-];
-
-foreach ($possibleAutoloadPaths as $possibleAutoloadPath) {
-    if (is_file($possibleAutoloadPath . '/autoload.php')) {
-        require_once $possibleAutoloadPath . '/autoload.php';
-        require_once $possibleAutoloadPath . '/squizlabs/php_codesniffer/autoload.php';
-
-        // initalize PHPCS tokens
-        new Tokens();
-
-        break;
-    }
-}
+$autoloadIncluder = new AutoloadIncluder();
+$autoloadIncluder->includeCwdVendorAutoloadIfExists();
+$autoloadIncluder->autoloadProjectAutoloaderFile('/../../autoload.php');
+$autoloadIncluder->includeDependencyOrRepositoryVendorAutoloadIfExists();
+$autoloadIncluder->includePhpCodeSnifferAutoloadIfNotInPharAndInitliazeTokens();
 
 # 2. create container
 $configs = [];
@@ -48,20 +33,18 @@ $input = new ArgvInput();
 $inputConfig = $configResolver->resolveFromInputWithFallback($input,
     ['easy-coding-standard.yml', 'easy-coding-standard.yaml', 'ecs.yml', 'ecs.yaml']
 );
-
 if ($inputConfig) {
     $configs[] = $inputConfig;
 }
 
 // 2. --set CLI option
-$setInputConfig = $configResolver->resolveSetFromInputAndDirectory($input, __DIR__ . '/../config/set');
+$setInputConfig = $configResolver->resolveSetFromInputAndDirectory($input, Set::SET_DIRECTORY);
 if ($setInputConfig) {
     $configs[] = $setInputConfig;
 }
 
 // 3. "parameters > set" in provided yaml files
 $parameterSetsConfigs = $configResolver->resolveFromParameterSetsFromConfigFiles($configs, Set::SET_DIRECTORY);
-
 if ($parameterSetsConfigs !== []) {
     $configs = array_merge($configs, $parameterSetsConfigs);
 }
@@ -89,8 +72,9 @@ foreach ($configs as $config) {
     }
 }
 
-$mainConfigShiftedAsLast[] = $inputConfig;
-
+if ($inputConfig !== null) {
+    $mainConfigShiftedAsLast[] = $inputConfig;
+}
 
 $easyCodingStandardKernel = new EasyCodingStandardKernel($environment, InputDetector::isDebug());
 if ($configs !== []) {
@@ -112,3 +96,127 @@ $configuration->setFirstResolverConfig($configResolver->getFirstResolvedConfig()
 # 3. run
 $application = $container->get(EasyCodingStandardConsoleApplication::class);
 exit($application->run());
+
+
+/**
+ * Inspired by https://github.com/rectorphp/rector/pull/2373/files#diff-0fc04a2bb7928cac4ae339d5a8bf67f3
+ */
+final class AutoloadIncluder
+{
+    /**
+     * @var string[]
+     */
+    private $alreadyLoadedAutoloadFiles = [];
+
+    public function includeCwdVendorAutoloadIfExists(): void
+    {
+        $cwdVendorAutoload = getcwd() . '/vendor/autoload.php';
+        if (!is_file($cwdVendorAutoload)) {
+            return;
+        }
+        $this->loadIfNotLoadedYet($cwdVendorAutoload, __METHOD__ . '()" on line ' . __LINE__);
+    }
+
+    public function includeDependencyOrRepositoryVendorAutoloadIfExists(): void
+    {
+        // ECS' vendor is already loaded
+        if (class_exists('\Symplify\EasyCodingStandard\HttpKernel\EasyCodingStandardKernel')) {
+            return;
+        }
+
+        $devOrPharVendorAutoload = __DIR__ . '/../vendor/autoload.php';
+        if (! is_file($devOrPharVendorAutoload)) {
+            return;
+        }
+
+        $this->loadIfNotLoadedYet($devOrPharVendorAutoload, __METHOD__ . '()" on line ' . __LINE__);
+    }
+    /**
+     * Inspired by https://github.com/phpstan/phpstan-src/blob/e2308ecaf49a9960510c47f5a992ce7b27f6dba2/bin/phpstan#L19
+     */
+    public function autoloadProjectAutoloaderFile(string $file): void
+    {
+        $path = dirname(__DIR__) . $file;
+        if (!extension_loaded('phar')) {
+            if (is_file($path)) {
+                $this->loadIfNotLoadedYet($path, __METHOD__ . '()" on line ' . __LINE__);
+            }
+        } else {
+            $pharPath = Phar::running(false);
+            if ($pharPath === '') {
+                if (is_file($path)) {
+                    $this->loadIfNotLoadedYet($path, __METHOD__ . '()" on line ' . __LINE__);
+                }
+            } else {
+                $path = dirname($pharPath) . $file;
+                if (is_file($path)) {
+                    $this->loadIfNotLoadedYet($path, __METHOD__ . '()" on line ' . __LINE__);
+                }
+            }
+        }
+    }
+
+    private function isInPhar(): bool
+    {
+        if (!extension_loaded('phar')) {
+            return false;
+        }
+
+        if (Phar::running(false) === '') {
+            return false;
+        }
+
+        return true;
+    }
+
+    private function loadIfNotLoadedYet(string $file, string $location): void
+    {
+        if (in_array($file, $this->alreadyLoadedAutoloadFiles, true)) {
+            return;
+        }
+
+        if ($this->isDebugOption()) {
+            echo sprintf(sprintf(
+                'File "%s" is about to be loaded in "%s"' . PHP_EOL,
+                $file,
+                $location
+            ));
+        }
+
+        $this->alreadyLoadedAutoloadFiles[] = realpath($file);
+        require_once $file;
+    }
+
+    private function isDebugOption(): bool
+    {
+        return in_array('--debug', $_SERVER['argv'], true);
+    }
+
+    public function includePhpCodeSnifferAutoloadIfNotInPharAndInitliazeTokens()
+    {
+        // file is autoloaded with classmap in PHAR
+        // without phar, we still need to autoload it
+        if (! $this->isInPhar()) {
+            # 1. autoload
+            $possibleAutoloadPaths = [
+                // after split package
+                __DIR__ . '/../vendor',
+                // dependency
+                __DIR__ . '/../../..',
+                // monorepo
+                __DIR__ . '/../../../vendor',
+            ];
+
+            foreach ($possibleAutoloadPaths as $possibleAutoloadPath) {
+                if (!is_file($possibleAutoloadPath . '/autoload.php')) {
+                    continue;
+                }
+
+                require_once $possibleAutoloadPath . '/squizlabs/php_codesniffer/autoload.php';
+            }
+        }
+
+        // initalize PHPCS tokens
+        new Tokens();
+    }
+}
diff --git a/packages/EasyCodingStandard/compiler/.gitignore b/packages/EasyCodingStandard/compiler/.gitignore
new file mode 100644
index 0000000000..896f3ff84a
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/.gitignore
@@ -0,0 +1,3 @@
+/temp
+!/temp/.gitkeep
+/vendor
diff --git a/packages/EasyCodingStandard/compiler/README.md b/packages/EasyCodingStandard/compiler/README.md
new file mode 100644
index 0000000000..a6212c5ea8
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/README.md
@@ -0,0 +1,29 @@
+# PHAR Compiler for EasyCodingStandard
+
+## Compile the PHAR
+
+```bash
+composer install
+bin/compile
+```
+
+The compiled PHAR will be in `tmp/ecs.phar`. Test it:
+
+```bash
+php ../tmp/ecs.phar
+```
+
+Please note that running the compiler will change the contents of `composer.json` file and `vendor` directory. Revert those changes after running it.
+
+## Notes
+
+This section si needed in `composer.json`, because it was causing autolaoding bugs.
+Box aliases existing Symfony stubs to php, see https://ayesh.me/composer-replace-polyfills.
+
+```json
+{
+    "replace": {
+        "symfony/polyfill-php70": "*"
+    }
+}
+```
diff --git a/packages/EasyCodingStandard/compiler/bin/compile b/packages/EasyCodingStandard/compiler/bin/compile
new file mode 100755
index 0000000000..28df674a4f
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/bin/compile
@@ -0,0 +1,23 @@
+#!/usr/bin/env php
+<?php
+
+declare(strict_types = 1);
+
+use Symplify\EasyCodingStandard\Compiler\Console\CompileCommand;
+use Symplify\EasyCodingStandard\Compiler\Process\CompileProcessFactory;
+use Symfony\Component\Console\Application;
+
+// use EasyCodingStandard package autoload.php
+require_once __DIR__ . '/../vendor/autoload.php';
+
+$compileCommand = new CompileCommand(
+	new CompileProcessFactory(),
+    __DIR__ . '/../build',
+	__DIR__ . '/../..'
+);
+
+/** @var Application $application */
+$application = new Application();
+$application->add($compileCommand);
+$application->setDefaultCommand($compileCommand->getName(), true);
+$application->run();
diff --git a/packages/EasyCodingStandard/compiler/build/box.json b/packages/EasyCodingStandard/compiler/build/box.json
new file mode 100644
index 0000000000..b74013f767
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/build/box.json
@@ -0,0 +1,17 @@
+{
+    "alias": "ecs.phar",
+    "banner": false,
+    "base-path": "../..",
+    "check-requirements": false,
+    "compactors": [
+        "KevinGH\\Box\\Compactor\\PhpScoper"
+    ],
+    "directories": [
+        "config",
+        "src",
+        "packages",
+        "vendor"
+    ],
+    "output": "tmp/ecs.phar",
+    "php-scoper": "compiler/build/scoper.inc.php"
+}
diff --git a/packages/EasyCodingStandard/compiler/build/box.phar b/packages/EasyCodingStandard/compiler/build/box.phar
new file mode 100755
index 0000000000..edfa4a7ae4
Binary files /dev/null and b/packages/EasyCodingStandard/compiler/build/box.phar differ
diff --git a/packages/EasyCodingStandard/compiler/build/scoper.inc.php b/packages/EasyCodingStandard/compiler/build/scoper.inc.php
new file mode 100644
index 0000000000..6d319d71fc
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/build/scoper.inc.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+use Nette\Utils\Strings;
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+return [
+    'prefix' => null,
+    'finders' => [],
+    'patchers' => [
+        function (string $filePath, string $prefix, string $content): string {
+            if ($filePath !== 'bin/ecs') {
+                return $content;
+            }
+            return str_replace('__DIR__ . \'/..', '\'phar://ecs.phar', $content);
+        },
+
+        // scoping stupid string contact class naming from: https://github.com/squizlabs/PHP_CodeSniffer/blob/b477a41ac565dad7a01c8b42f4804280723ad02f/src/Files/File.php#L562
+
+        function (string $filePath, string $prefix, string $content): string {
+            if (! Strings::endsWith($filePath, 'src/Files/File.php')) {
+                return $content;
+            }
+
+            // $tokenizerClass = 'PHP_CodeSniffer\\Tokenizers\\' . $this->tokenizerType; →
+            // $tokenizerClass = 'MagicScoperPrefix\\PHP_CodeSniffer\\Tokenizers\\' . $this->tokenizerType;
+            return Strings::replace($content, '#\'PHP_CodeSniffer#', sprintf("'%s\\\\PHP_CodeSniffer", $prefix));
+        },
+    ],
+    'whitelist' => [
+        // needed for autoload, that is not prefixed, since it's in bin/* file
+        'Symplify\*',
+    ],
+];
diff --git a/packages/EasyCodingStandard/compiler/composer.json b/packages/EasyCodingStandard/compiler/composer.json
new file mode 100644
index 0000000000..5c5ae66e6a
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/composer.json
@@ -0,0 +1,22 @@
+{
+    "name": "symplify/easy-coding-standard-compiler",
+    "description": "PHAR Compiler for ECS",
+    "license": "MIT",
+    "require": {
+        "php": "^7.2",
+        "nette/utils": "^3.0",
+        "phar-io/version": "^2.0.1",
+        "symfony/console": "^4.4|^5.0",
+        "symfony/filesystem": "^4.4|^5.0",
+        "symfony/finder": "^4.4|^5.0",
+        "symfony/process": "^4.4|^5.0"
+    },
+    "require-dev": {
+        "tracy/tracy": "^2.7"
+    },
+    "autoload": {
+        "psr-4": {
+            "Symplify\\EasyCodingStandard\\Compiler\\": "src"
+        }
+    }
+}
diff --git a/packages/EasyCodingStandard/compiler/src/Console/CompileCommand.php b/packages/EasyCodingStandard/compiler/src/Console/CompileCommand.php
new file mode 100644
index 0000000000..06555087fe
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/src/Console/CompileCommand.php
@@ -0,0 +1,164 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\EasyCodingStandard\Compiler\Console;
+
+use Nette\Utils\FileSystem as NetteFileSystem;
+use Nette\Utils\Json;
+use Nette\Utils\Strings;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Filesystem\Filesystem;
+use Symplify\EasyCodingStandard\Compiler\Packagist\SymplifyStableVersionProvider;
+use Symplify\EasyCodingStandard\Compiler\Process\CompileProcessFactory;
+
+/**
+ * Inspired by @see https://github.com/phpstan/phpstan-src/blob/f939d23155627b5c2ec6eef36d976dddea22c0c5/compiler/src/Console/CompileCommand.php
+ */
+final class CompileCommand extends Command
+{
+    /**
+     * @var string
+     */
+    private $dataDir;
+
+    /**
+     * @var string
+     */
+    private $buildDir;
+
+    /**
+     * @var string
+     */
+    private $originalComposerJsonFileContent;
+
+    /**
+     * @var Filesystem
+     */
+    private $filesystem;
+
+    /**
+     * @var CompileProcessFactory
+     */
+    private $compileProcessFactory;
+
+    /**
+     * @var SymplifyStableVersionProvider
+     */
+    private $symplifyStableVersionProvider;
+
+    public function __construct(CompileProcessFactory $compileProcessFactory, string $dataDir, string $buildDir)
+    {
+        parent::__construct();
+        $this->filesystem = new Filesystem();
+        $this->compileProcessFactory = $compileProcessFactory;
+        $this->dataDir = $dataDir;
+        $this->buildDir = $buildDir;
+        $this->symplifyStableVersionProvider = new SymplifyStableVersionProvider();
+    }
+
+    protected function configure(): void
+    {
+        $this->setName('ecs:compile');
+        $this->setDescription('Compile prefixed ecs.phar');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $this->compileProcessFactory->setOutput($output);
+
+        $composerJsonFile = $this->buildDir . '/composer.json';
+
+        $this->fixComposerJson($composerJsonFile);
+        // @see https://github.com/dotherightthing/wpdtrt-plugin-boilerplate/issues/52
+        $this->compileProcessFactory->create(
+            ['composer', 'update', '--no-dev', '--prefer-dist', '--no-interaction', '--classmap-authoritative'],
+            $this->buildDir
+        );
+
+        // parallel prevention is just for single less-buggy process
+        $this->compileProcessFactory->create(['php', 'box.phar', 'compile', '--no-parallel'], $this->dataDir);
+
+        $this->restoreComposerJson($composerJsonFile);
+
+        return 0;
+    }
+
+    private function fixComposerJson(string $composerJsonFile): void
+    {
+        $fileContent = NetteFileSystem::read($composerJsonFile);
+        $this->originalComposerJsonFileContent = $fileContent;
+
+        $json = Json::decode($fileContent, Json::FORCE_ARRAY);
+
+        $json = $this->replaceDevSymplifyVersionWithLastStableVersion($json);
+        $json = $this->fixPhpCodeSnifferAutoloading($json);
+
+        $json = $this->removeDevContent($json);
+        $this->cleanupPhpCsFixerBreakingFiles();
+
+        $encodedJson = Json::encode($json, Json::PRETTY);
+
+        $this->filesystem->dumpFile($composerJsonFile, $encodedJson);
+    }
+
+    /**
+     * This prevent root composer.json constant override
+     */
+    private function restoreComposerJson(string $composerJsonFile): void
+    {
+        $this->filesystem->dumpFile($composerJsonFile, $this->originalComposerJsonFileContent);
+
+        // re-run @todo composer update on root
+    }
+
+    private function replaceDevSymplifyVersionWithLastStableVersion(array $json): array
+    {
+        $symplifyVersionToRequire = $this->symplifyStableVersionProvider->provide();
+
+        foreach (array_keys($json['require']) as $package) {
+            /** @var string $package */
+            if (! Strings::startsWith($package, 'symplify/')) {
+                continue;
+            }
+
+            $json['require'][$package] = $symplifyVersionToRequire;
+        }
+        return $json;
+    }
+
+    private function cleanupPhpCsFixerBreakingFiles(): void
+    {
+        // cleanup
+        $filesToRemove = [
+            __DIR__ . '/../../../vendor/friendsofphp/php-cs-fixer/src/Test/AbstractIntegrationTestCase.php',
+        ];
+
+        foreach ($filesToRemove as $fileToRemove) {
+            NetteFileSystem::delete($fileToRemove);
+        }
+    }
+
+    private function removeDevContent(array $json): array
+    {
+        $keysToRemove = ['require-dev', 'autoload-dev', 'minimum-stability', 'prefer-stable', 'extra'];
+
+        foreach ($keysToRemove as $keyToRemove) {
+            unset($json[$keyToRemove]);
+        }
+
+        return $json;
+    }
+
+    /**
+     * Their autoloader is broken inside the phar :/
+     */
+    private function fixPhpCodeSnifferAutoloading(array $json): array
+    {
+        $json['autoload']['classmap'][] = 'vendor/squizlabs/php_codesniffer/src';
+
+        return $json;
+    }
+}
diff --git a/packages/EasyCodingStandard/compiler/src/Exception/ShouldNotHappenException.php b/packages/EasyCodingStandard/compiler/src/Exception/ShouldNotHappenException.php
new file mode 100644
index 0000000000..c355307f72
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/src/Exception/ShouldNotHappenException.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\EasyCodingStandard\Compiler\Exception;
+
+use Exception;
+
+final class ShouldNotHappenException extends Exception
+{
+}
diff --git a/packages/EasyCodingStandard/compiler/src/Packagist/SymplifyStableVersionProvider.php b/packages/EasyCodingStandard/compiler/src/Packagist/SymplifyStableVersionProvider.php
new file mode 100644
index 0000000000..41601fc049
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/src/Packagist/SymplifyStableVersionProvider.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\EasyCodingStandard\Compiler\Packagist;
+
+use Nette\Utils\Json;
+use PharIo\Version\Version;
+use Symplify\EasyCodingStandard\Compiler\Exception\ShouldNotHappenException;
+
+final class SymplifyStableVersionProvider
+{
+    /**
+     * @var string|null
+     */
+    private $symplifyVersionToRequire;
+
+    public function provide(): string
+    {
+        if ($this->symplifyVersionToRequire !== null) {
+            return $this->symplifyVersionToRequire;
+        }
+
+        $symplifyPackageContent = file_get_contents('https://repo.packagist.org/p/symplify/symplify.json');
+        if ($symplifyPackageContent === null) {
+            throw new ShouldNotHappenException();
+        }
+
+        $symplifyPackageJson = $this->loadContentJsonStringToArray($symplifyPackageContent);
+        $symplifyPackageVersions = $symplifyPackageJson['packages']['symplify/symplify'];
+
+        $lastStableVersion = $this->getLastKey($symplifyPackageVersions);
+
+        $lastStableVersion = new Version($lastStableVersion);
+
+        $this->symplifyVersionToRequire = '^' . $lastStableVersion->getMajor()->getValue() . '.' . $lastStableVersion->getMinor()->getValue();
+
+        return $this->symplifyVersionToRequire;
+    }
+
+    private function loadContentJsonStringToArray(string $jsonContent): array
+    {
+        return Json::decode($jsonContent, Json::FORCE_ARRAY);
+    }
+
+    private function getLastKey(array $items): string
+    {
+        end($items);
+
+        return key($items);
+    }
+}
diff --git a/packages/EasyCodingStandard/compiler/src/Process/CompileProcessFactory.php b/packages/EasyCodingStandard/compiler/src/Process/CompileProcessFactory.php
new file mode 100644
index 0000000000..c9306c297f
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/src/Process/CompileProcessFactory.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\EasyCodingStandard\Compiler\Process;
+
+use Symfony\Component\Console\Output\NullOutput;
+use Symfony\Component\Console\Output\OutputInterface;
+
+final class CompileProcessFactory
+{
+    /**
+     * @var OutputInterface
+     */
+    private $output;
+
+    public function __construct()
+    {
+        $this->output = new NullOutput();
+    }
+
+    /**
+     * @param string[] $command
+     */
+    public function create(array $command, string $cwd): SymfonyProcess
+    {
+        return new SymfonyProcess($command, $cwd, $this->output);
+    }
+
+    public function setOutput(OutputInterface $output): void
+    {
+        $this->output = $output;
+    }
+}
diff --git a/packages/EasyCodingStandard/compiler/src/Process/SymfonyProcess.php b/packages/EasyCodingStandard/compiler/src/Process/SymfonyProcess.php
new file mode 100644
index 0000000000..35e0d4fbe7
--- /dev/null
+++ b/packages/EasyCodingStandard/compiler/src/Process/SymfonyProcess.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\EasyCodingStandard\Compiler\Process;
+
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Process\Process;
+
+final class SymfonyProcess
+{
+    /**
+     * @param string[] $command
+     */
+    public function __construct(array $command, string $cwd, OutputInterface $output)
+    {
+        (new Process($command, $cwd, null, null, null))
+            ->mustRun(static function (string $type, string $buffer) use ($output): void {
+                $output->write($buffer);
+            });
+    }
+}
diff --git a/packages/EasyCodingStandard/composer.json b/packages/EasyCodingStandard/composer.json
index c936847459..987ec3a944 100644
--- a/packages/EasyCodingStandard/composer.json
+++ b/packages/EasyCodingStandard/composer.json
@@ -8,8 +8,14 @@
     "require": {
         "php": "^7.2",
         "composer/xdebug-handler": "^1.4",
+        "friendsofphp/php-cs-fixer": "^2.16",
+        "jean85/pretty-package-versions": "^1.2",
         "nette/utils": "^3.0",
         "nette/robot-loader": "^3.2",
+        "ocramius/package-versions": "^1.4",
+        "psr/simple-cache": "^1.0",
+        "squizlabs/php_codesniffer": "^3.5",
+        "slevomat/coding-standard": "^6.0",
         "symfony/cache": "^4.4|^5.0",
         "symfony/console": "^4.4|^5.0",
         "symfony/config": "^4.4|^5.0",
@@ -22,13 +28,7 @@
         "symplify/set-config-resolver": "^7.3",
         "symplify/smart-file-system": "^7.3",
         "symplify/autowire-array-parameter": "^7.3",
-        "symplify/auto-bind-parameter": "^7.3",
-        "slevomat/coding-standard": "^6.0",
-        "friendsofphp/php-cs-fixer": "^2.16",
-        "squizlabs/php_codesniffer": "^3.5",
-        "jean85/pretty-package-versions": "^1.2",
-        "ocramius/package-versions": "^1.4",
-        "psr/simple-cache": "^1.0"
+        "symplify/auto-bind-parameter": "^7.3"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5",
@@ -51,6 +51,9 @@
             "Symplify\\EasyCodingStandard\\Tests\\": "tests"
         }
     },
+    "replace": {
+        "symfony/polyfill-php70": "*"
+    },
     "extra": {
         "branch-alias": {
             "dev-master": "7.3-dev"
diff --git a/packages/EasyCodingStandard/config/services.yaml b/packages/EasyCodingStandard/config/services.yaml
index 50685e95b8..52a5f570af 100644
--- a/packages/EasyCodingStandard/config/services.yaml
+++ b/packages/EasyCodingStandard/config/services.yaml
@@ -9,20 +9,12 @@ services:
     Symplify\EasyCodingStandard\:
         resource: '../src'
         exclude:
-            - '../src/Contract'
-            - '../src/DependencyInjection'
-            - '../src/HttpKernel'
-            - '../src/Exception'
-            - '../src/Error/Error.php'
-            - '../src/Error/FileDiff.php'
-            - '../src/Yaml'
-
-    _instanceof:
-        Symplify\EasyCodingStandard\Contract\Application\FileProcessorCollectorInterface:
-            calls:
-                # orders matters, so Fixer can cleanup after Sniffer
-                - ['addFileProcessor', ['@Symplify\EasyCodingStandard\SniffRunner\Application\SniffFileProcessor']]
-                - ['addFileProcessor', ['@Symplify\EasyCodingStandard\FixerRunner\Application\FixerFileProcessor']]
+            - '../src/Contract/*'
+            - '../src/DependencyInjection/*'
+            - '../src/HttpKernel/*'
+            - '../src/Exception/*'
+            - '../src/ValueObject/*'
+            - '../src/Yaml/*'
 
     # Console
     Symfony\Component\Console\Terminal: ~
diff --git a/packages/EasyCodingStandard/config/set/php_cs_fixer/php-cs-fixer-psr2.yaml b/packages/EasyCodingStandard/config/set/php_cs_fixer/php-cs-fixer-psr2.yaml
index cb46d9388b..6c1d69a2ba 100644
--- a/packages/EasyCodingStandard/config/set/php_cs_fixer/php-cs-fixer-psr2.yaml
+++ b/packages/EasyCodingStandard/config/set/php_cs_fixer/php-cs-fixer-psr2.yaml
@@ -1,4 +1,4 @@
-# updated to PHP CS Fixer v2.11.0
+# updated to PHP CS Fixer v2.11.0 from https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/master/src/RuleSet.php
 
 services:
     # PSR1
diff --git a/packages/EasyCodingStandard/packages/Configuration/config/services.yaml b/packages/EasyCodingStandard/packages/Configuration/config/services.yaml
index c009c6caf3..2e1fb0cdaf 100644
--- a/packages/EasyCodingStandard/packages/Configuration/config/services.yaml
+++ b/packages/EasyCodingStandard/packages/Configuration/config/services.yaml
@@ -6,4 +6,4 @@ services:
     Symplify\EasyCodingStandard\Configuration\:
         resource: '../src'
         exclude:
-            - '../src/Exception'
+            - '../src/Exception/*'
diff --git a/packages/EasyCodingStandard/packages/FixerRunner/config/services.yaml b/packages/EasyCodingStandard/packages/FixerRunner/config/services.yaml
index f8ea95f9c4..efc62e2ce6 100644
--- a/packages/EasyCodingStandard/packages/FixerRunner/config/services.yaml
+++ b/packages/EasyCodingStandard/packages/FixerRunner/config/services.yaml
@@ -6,7 +6,7 @@ services:
     Symplify\EasyCodingStandard\FixerRunner\:
         resource: '../src'
         exclude:
-            - '../src/Exception'
+            - '../src/Exception/*'
 
     # differ
     PhpCsFixer\Differ\UnifiedDiffer: ~
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/config/services.yaml b/packages/EasyCodingStandard/packages/SniffRunner/config/services.yaml
index 7e0c50c449..21f85df7c0 100644
--- a/packages/EasyCodingStandard/packages/SniffRunner/config/services.yaml
+++ b/packages/EasyCodingStandard/packages/SniffRunner/config/services.yaml
@@ -6,5 +6,5 @@ services:
     Symplify\EasyCodingStandard\SniffRunner\:
         resource: '../src'
         exclude:
-            - '../src/Exception'
-            - '../src/File/File.php'
+            - '../src/Exception/*'
+            - '../src/ValueObject/*'
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/src/Application/SniffFileProcessor.php b/packages/EasyCodingStandard/packages/SniffRunner/src/Application/SniffFileProcessor.php
index 2a95418993..c0d8e805ba 100644
--- a/packages/EasyCodingStandard/packages/SniffRunner/src/Application/SniffFileProcessor.php
+++ b/packages/EasyCodingStandard/packages/SniffRunner/src/Application/SniffFileProcessor.php
@@ -16,8 +16,8 @@
 use Symplify\EasyCodingStandard\Contract\Application\DualRunInterface;
 use Symplify\EasyCodingStandard\Contract\Application\FileProcessorInterface;
 use Symplify\EasyCodingStandard\Error\ErrorAndDiffCollector;
-use Symplify\EasyCodingStandard\SniffRunner\File\File;
 use Symplify\EasyCodingStandard\SniffRunner\File\FileFactory;
+use Symplify\EasyCodingStandard\SniffRunner\ValueObject\File;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
 final class SniffFileProcessor implements FileProcessorInterface, DualRunAwareFileProcessorInterface
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/src/File/FileFactory.php b/packages/EasyCodingStandard/packages/SniffRunner/src/File/FileFactory.php
index 2dea10aa62..d3547a2f1a 100644
--- a/packages/EasyCodingStandard/packages/SniffRunner/src/File/FileFactory.php
+++ b/packages/EasyCodingStandard/packages/SniffRunner/src/File/FileFactory.php
@@ -9,6 +9,7 @@
 use Symplify\EasyCodingStandard\Console\Style\EasyCodingStandardStyle;
 use Symplify\EasyCodingStandard\Error\ErrorAndDiffCollector;
 use Symplify\EasyCodingStandard\Skipper;
+use Symplify\EasyCodingStandard\SniffRunner\ValueObject\File;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
 final class FileFactory
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/src/File/File.php b/packages/EasyCodingStandard/packages/SniffRunner/src/ValueObject/File.php
similarity index 99%
rename from packages/EasyCodingStandard/packages/SniffRunner/src/File/File.php
rename to packages/EasyCodingStandard/packages/SniffRunner/src/ValueObject/File.php
index 0a2308e18e..aecdf58457 100644
--- a/packages/EasyCodingStandard/packages/SniffRunner/src/File/File.php
+++ b/packages/EasyCodingStandard/packages/SniffRunner/src/ValueObject/File.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Symplify\EasyCodingStandard\SniffRunner\File;
+namespace Symplify\EasyCodingStandard\SniffRunner\ValueObject;
 
 use PHP_CodeSniffer\Config;
 use PHP_CodeSniffer\Files\File as BaseFile;
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/tests/Application/FixerTest.php b/packages/EasyCodingStandard/packages/SniffRunner/tests/Application/FixerTest.php
index c5c6c29980..ebe5409266 100644
--- a/packages/EasyCodingStandard/packages/SniffRunner/tests/Application/FixerTest.php
+++ b/packages/EasyCodingStandard/packages/SniffRunner/tests/Application/FixerTest.php
@@ -6,8 +6,8 @@
 
 use PHP_CodeSniffer\Fixer;
 use Symplify\EasyCodingStandard\HttpKernel\EasyCodingStandardKernel;
-use Symplify\EasyCodingStandard\SniffRunner\File\File;
 use Symplify\EasyCodingStandard\SniffRunner\File\FileFactory;
+use Symplify\EasyCodingStandard\SniffRunner\ValueObject\File;
 use Symplify\PackageBuilder\Tests\AbstractKernelTestCase;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/tests/Error/ErrorSorterTest.php b/packages/EasyCodingStandard/packages/SniffRunner/tests/Error/ErrorSorterTest.php
index 042980e6c3..031bba28c9 100644
--- a/packages/EasyCodingStandard/packages/SniffRunner/tests/Error/ErrorSorterTest.php
+++ b/packages/EasyCodingStandard/packages/SniffRunner/tests/Error/ErrorSorterTest.php
@@ -4,10 +4,10 @@
 
 namespace Symplify\EasyCodingStandard\SniffRunner\Tests\Error;
 
-use Symplify\EasyCodingStandard\Error\Error;
 use Symplify\EasyCodingStandard\Error\ErrorFactory;
 use Symplify\EasyCodingStandard\Error\ErrorSorter;
 use Symplify\EasyCodingStandard\HttpKernel\EasyCodingStandardKernel;
+use Symplify\EasyCodingStandard\ValueObject\Error\Error;
 use Symplify\PackageBuilder\Tests\AbstractKernelTestCase;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/tests/File/FileFactoryTest.php b/packages/EasyCodingStandard/packages/SniffRunner/tests/File/FileFactoryTest.php
index 72e2165c38..7acd374e51 100644
--- a/packages/EasyCodingStandard/packages/SniffRunner/tests/File/FileFactoryTest.php
+++ b/packages/EasyCodingStandard/packages/SniffRunner/tests/File/FileFactoryTest.php
@@ -7,8 +7,8 @@
 use PHP_CodeSniffer\Files\File as PhpCodeSnifferFile;
 use PHP_CodeSniffer\Fixer;
 use Symplify\EasyCodingStandard\HttpKernel\EasyCodingStandardKernel;
-use Symplify\EasyCodingStandard\SniffRunner\File\File;
 use Symplify\EasyCodingStandard\SniffRunner\File\FileFactory;
+use Symplify\EasyCodingStandard\SniffRunner\ValueObject\File;
 use Symplify\PackageBuilder\Tests\AbstractKernelTestCase;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/tests/ValueObject/FileSource/SomeFile.php b/packages/EasyCodingStandard/packages/SniffRunner/tests/ValueObject/FileSource/SomeFile.php
new file mode 100644
index 0000000000..174d7fd709
--- /dev/null
+++ b/packages/EasyCodingStandard/packages/SniffRunner/tests/ValueObject/FileSource/SomeFile.php
@@ -0,0 +1,3 @@
+<?php
+
+declare(strict_types=1);
diff --git a/packages/EasyCodingStandard/packages/SniffRunner/tests/File/FileTest.php b/packages/EasyCodingStandard/packages/SniffRunner/tests/ValueObject/FileTest.php
similarity index 89%
rename from packages/EasyCodingStandard/packages/SniffRunner/tests/File/FileTest.php
rename to packages/EasyCodingStandard/packages/SniffRunner/tests/ValueObject/FileTest.php
index cbac3026c7..cd1b94e636 100644
--- a/packages/EasyCodingStandard/packages/SniffRunner/tests/File/FileTest.php
+++ b/packages/EasyCodingStandard/packages/SniffRunner/tests/ValueObject/FileTest.php
@@ -2,13 +2,13 @@
 
 declare(strict_types=1);
 
-namespace Symplify\EasyCodingStandard\SniffRunner\Tests\File;
+namespace Symplify\EasyCodingStandard\SniffRunner\Tests\ValueObject;
 
 use Symplify\EasyCodingStandard\Error\ErrorAndDiffCollector;
 use Symplify\EasyCodingStandard\HttpKernel\EasyCodingStandardKernel;
 use Symplify\EasyCodingStandard\SniffRunner\Exception\File\NotImplementedException;
-use Symplify\EasyCodingStandard\SniffRunner\File\File;
 use Symplify\EasyCodingStandard\SniffRunner\File\FileFactory;
+use Symplify\EasyCodingStandard\SniffRunner\ValueObject\File;
 use Symplify\PackageBuilder\Tests\AbstractKernelTestCase;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
@@ -31,7 +31,7 @@ protected function setUp(): void
         $this->errorAndDiffCollector = self::$container->get(ErrorAndDiffCollector::class);
 
         $fileFactory = self::$container->get(FileFactory::class);
-        $fileInfo = new SmartFileInfo(__DIR__ . '/FileFactorySource/SomeFile.php');
+        $fileInfo = new SmartFileInfo(__DIR__ . '/FileSource/SomeFile.php');
 
         $this->file = $fileFactory->createFromFileInfo($fileInfo);
         $this->file->processWithTokenListenersAndFileInfo([], $fileInfo);
diff --git a/packages/EasyCodingStandard/src/Application/EasyCodingStandardApplication.php b/packages/EasyCodingStandard/src/Application/EasyCodingStandardApplication.php
index a6c6a110d0..697c37bd3d 100644
--- a/packages/EasyCodingStandard/src/Application/EasyCodingStandardApplication.php
+++ b/packages/EasyCodingStandard/src/Application/EasyCodingStandardApplication.php
@@ -8,19 +8,12 @@
 use Symplify\EasyCodingStandard\Configuration\Configuration;
 use Symplify\EasyCodingStandard\Console\Style\EasyCodingStandardStyle;
 use Symplify\EasyCodingStandard\Contract\Application\DualRunAwareFileProcessorInterface;
-use Symplify\EasyCodingStandard\Contract\Application\FileProcessorCollectorInterface;
-use Symplify\EasyCodingStandard\Contract\Application\FileProcessorInterface;
 use Symplify\EasyCodingStandard\FileSystem\FileFilter;
 use Symplify\EasyCodingStandard\Finder\SourceFinder;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
-final class EasyCodingStandardApplication implements FileProcessorCollectorInterface
+final class EasyCodingStandardApplication
 {
-    /**
-     * @var FileProcessorInterface[]
-     */
-    private $fileProcessors = [];
-
     /**
      * @var EasyCodingStandardStyle
      */
@@ -51,13 +44,19 @@ final class EasyCodingStandardApplication implements FileProcessorCollectorInter
      */
     private $singleFileProcessor;
 
+    /**
+     * @var FileProcessorCollector
+     */
+    private $fileProcessorCollector;
+
     public function __construct(
         EasyCodingStandardStyle $easyCodingStandardStyle,
         SourceFinder $sourceFinder,
         ChangedFilesDetector $changedFilesDetector,
         Configuration $configuration,
         FileFilter $fileFilter,
-        SingleFileProcessor $singleFileProcessor
+        SingleFileProcessor $singleFileProcessor,
+        FileProcessorCollector $fileProcessorCollector
     ) {
         $this->easyCodingStandardStyle = $easyCodingStandardStyle;
         $this->sourceFinder = $sourceFinder;
@@ -65,11 +64,7 @@ public function __construct(
         $this->configuration = $configuration;
         $this->fileFilter = $fileFilter;
         $this->singleFileProcessor = $singleFileProcessor;
-    }
-
-    public function addFileProcessor(FileProcessorInterface $fileProcessor): void
-    {
-        $this->fileProcessors[] = $fileProcessor;
+        $this->fileProcessorCollector = $fileProcessorCollector;
     }
 
     public function run(): int
@@ -109,7 +104,7 @@ public function getCheckerCount(): int
     {
         $checkerCount = 0;
 
-        foreach ($this->fileProcessors as $fileProcessor) {
+        foreach ($this->fileProcessorCollector->getFileProcessors() as $fileProcessor) {
             $checkerCount += count($fileProcessor->getCheckers());
         }
 
@@ -118,7 +113,7 @@ public function getCheckerCount(): int
 
     private function isDualRunEnabled(): bool
     {
-        foreach ($this->fileProcessors as $fileProcessor) {
+        foreach ($this->fileProcessorCollector->getFileProcessors() as $fileProcessor) {
             if (! $fileProcessor instanceof DualRunAwareFileProcessorInterface) {
                 continue;
             }
@@ -150,7 +145,7 @@ private function processFoundFilesSecondRun(array $fileInfos): void
     {
         foreach ($fileInfos as $fileInfo) {
             $this->processFileInfoWithCallable($fileInfo, function (SmartFileInfo $smartFileInfo): void {
-                foreach ($this->fileProcessors as $fileProcessor) {
+                foreach ($this->fileProcessorCollector->getFileProcessors() as $fileProcessor) {
                     if ($fileProcessor instanceof DualRunAwareFileProcessorInterface) {
                         $fileProcessor->processFileSecondRun($smartFileInfo);
                     }
diff --git a/packages/EasyCodingStandard/src/Application/FileProcessorCollector.php b/packages/EasyCodingStandard/src/Application/FileProcessorCollector.php
new file mode 100644
index 0000000000..e196edd4b8
--- /dev/null
+++ b/packages/EasyCodingStandard/src/Application/FileProcessorCollector.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\EasyCodingStandard\Application;
+
+use Symplify\EasyCodingStandard\Contract\Application\FileProcessorInterface;
+use Symplify\EasyCodingStandard\FixerRunner\Application\FixerFileProcessor;
+use Symplify\EasyCodingStandard\SniffRunner\Application\SniffFileProcessor;
+
+final class FileProcessorCollector
+{
+    /**
+     * @var FileProcessorInterface[]
+     */
+    private $fileProcessors = [];
+
+    /**
+     * orders matters, so Fixer can cleanup after Sniffer
+     */
+    public function __construct(SniffFileProcessor $sniffFileProcessor, FixerFileProcessor $fixerFileProcessor)
+    {
+        $this->fileProcessors[] = $sniffFileProcessor;
+        $this->fileProcessors[] = $fixerFileProcessor;
+    }
+
+    /**
+     * @return FileProcessorInterface[]
+     */
+    public function getFileProcessors(): array
+    {
+        return $this->fileProcessors;
+    }
+}
diff --git a/packages/EasyCodingStandard/src/Application/SingleFileProcessor.php b/packages/EasyCodingStandard/src/Application/SingleFileProcessor.php
index 07695e5b13..fda6c245cd 100644
--- a/packages/EasyCodingStandard/src/Application/SingleFileProcessor.php
+++ b/packages/EasyCodingStandard/src/Application/SingleFileProcessor.php
@@ -6,19 +6,12 @@
 
 use ParseError;
 use Symplify\EasyCodingStandard\ChangedFilesDetector\ChangedFilesDetector;
-use Symplify\EasyCodingStandard\Contract\Application\FileProcessorCollectorInterface;
-use Symplify\EasyCodingStandard\Contract\Application\FileProcessorInterface;
 use Symplify\EasyCodingStandard\Error\ErrorAndDiffCollector;
 use Symplify\EasyCodingStandard\Skipper;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
-final class SingleFileProcessor implements FileProcessorCollectorInterface
+final class SingleFileProcessor
 {
-    /**
-     * @var FileProcessorInterface[]
-     */
-    private $fileProcessors = [];
-
     /**
      * @var Skipper
      */
@@ -34,26 +27,28 @@ final class SingleFileProcessor implements FileProcessorCollectorInterface
      */
     private $errorAndDiffCollector;
 
+    /**
+     * @var FileProcessorCollector
+     */
+    private $fileProcessorCollector;
+
     public function __construct(
         Skipper $skipper,
         ChangedFilesDetector $changedFilesDetector,
-        ErrorAndDiffCollector $errorAndDiffCollector
+        ErrorAndDiffCollector $errorAndDiffCollector,
+        FileProcessorCollector $fileProcessorCollector
     ) {
         $this->skipper = $skipper;
         $this->changedFilesDetector = $changedFilesDetector;
         $this->errorAndDiffCollector = $errorAndDiffCollector;
-    }
-
-    public function addFileProcessor(FileProcessorInterface $fileProcessor): void
-    {
-        $this->fileProcessors[] = $fileProcessor;
+        $this->fileProcessorCollector = $fileProcessorCollector;
     }
 
     public function processFileInfo(SmartFileInfo $smartFileInfo): void
     {
         try {
             $this->changedFilesDetector->addFileInfo($smartFileInfo);
-            foreach ($this->fileProcessors as $fileProcessor) {
+            foreach ($this->fileProcessorCollector->getFileProcessors() as $fileProcessor) {
                 if ($fileProcessor->getCheckers() === []) {
                     continue;
                 }
diff --git a/packages/EasyCodingStandard/src/Console/Output/ConsoleOutputFormatter.php b/packages/EasyCodingStandard/src/Console/Output/ConsoleOutputFormatter.php
index a59646cad4..434f4be764 100644
--- a/packages/EasyCodingStandard/src/Console/Output/ConsoleOutputFormatter.php
+++ b/packages/EasyCodingStandard/src/Console/Output/ConsoleOutputFormatter.php
@@ -8,7 +8,7 @@
 use Symplify\EasyCodingStandard\Console\Style\EasyCodingStandardStyle;
 use Symplify\EasyCodingStandard\Contract\Console\Output\OutputFormatterInterface;
 use Symplify\EasyCodingStandard\Error\ErrorAndDiffCollector;
-use Symplify\EasyCodingStandard\Error\FileDiff;
+use Symplify\EasyCodingStandard\ValueObject\Error\FileDiff;
 use Symplify\PackageBuilder\Console\ShellCode;
 
 final class ConsoleOutputFormatter implements OutputFormatterInterface
diff --git a/packages/EasyCodingStandard/src/Console/Output/JsonOutputFormatter.php b/packages/EasyCodingStandard/src/Console/Output/JsonOutputFormatter.php
index 7e0ba82fad..18d5d0bc90 100644
--- a/packages/EasyCodingStandard/src/Console/Output/JsonOutputFormatter.php
+++ b/packages/EasyCodingStandard/src/Console/Output/JsonOutputFormatter.php
@@ -8,9 +8,9 @@
 use Symplify\EasyCodingStandard\Configuration\Configuration;
 use Symplify\EasyCodingStandard\Console\Style\EasyCodingStandardStyle;
 use Symplify\EasyCodingStandard\Contract\Console\Output\OutputFormatterInterface;
-use Symplify\EasyCodingStandard\Error\Error;
 use Symplify\EasyCodingStandard\Error\ErrorAndDiffCollector;
-use Symplify\EasyCodingStandard\Error\FileDiff;
+use Symplify\EasyCodingStandard\ValueObject\Error\Error;
+use Symplify\EasyCodingStandard\ValueObject\Error\FileDiff;
 use Symplify\PackageBuilder\Console\ShellCode;
 
 final class JsonOutputFormatter implements OutputFormatterInterface
diff --git a/packages/EasyCodingStandard/src/Console/Style/EasyCodingStandardStyle.php b/packages/EasyCodingStandard/src/Console/Style/EasyCodingStandardStyle.php
index d3a824dadf..1def668d89 100644
--- a/packages/EasyCodingStandard/src/Console/Style/EasyCodingStandardStyle.php
+++ b/packages/EasyCodingStandard/src/Console/Style/EasyCodingStandardStyle.php
@@ -8,7 +8,7 @@
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\Console\Terminal;
-use Symplify\EasyCodingStandard\Error\Error;
+use Symplify\EasyCodingStandard\ValueObject\Error\Error;
 
 final class EasyCodingStandardStyle extends SymfonyStyle
 {
diff --git a/packages/EasyCodingStandard/src/Contract/Application/FileProcessorCollectorInterface.php b/packages/EasyCodingStandard/src/Contract/Application/FileProcessorCollectorInterface.php
deleted file mode 100644
index 540e2a8e63..0000000000
--- a/packages/EasyCodingStandard/src/Contract/Application/FileProcessorCollectorInterface.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Symplify\EasyCodingStandard\Contract\Application;
-
-interface FileProcessorCollectorInterface
-{
-    public function addFileProcessor(FileProcessorInterface $fileProcessor): void;
-}
diff --git a/packages/EasyCodingStandard/src/DependencyInjection/DelegatingLoaderFactory.php b/packages/EasyCodingStandard/src/DependencyInjection/DelegatingLoaderFactory.php
index 6686c93f1a..593f2a499a 100644
--- a/packages/EasyCodingStandard/src/DependencyInjection/DelegatingLoaderFactory.php
+++ b/packages/EasyCodingStandard/src/DependencyInjection/DelegatingLoaderFactory.php
@@ -19,7 +19,9 @@ public function createFromContainerBuilderAndKernel(
         ContainerBuilder $containerBuilder,
         KernelInterface $kernel
     ): DelegatingLoader {
-        return $this->createFromContainerBuilderAndFileLocator($containerBuilder, new FileLocator($kernel));
+        $kernelFileLocator = new FileLocator($kernel);
+
+        return $this->createFromContainerBuilderAndFileLocator($containerBuilder, $kernelFileLocator);
     }
 
     /**
@@ -29,7 +31,8 @@ public function createContainerBuilderAndConfig(
         ContainerBuilder $containerBuilder,
         string $config
     ): DelegatingLoader {
-        $fileLocator = new SimpleFileLocator(dirname($config));
+        $directory = dirname($config);
+        $fileLocator = new SimpleFileLocator($directory);
 
         return $this->createFromContainerBuilderAndFileLocator($containerBuilder, $fileLocator);
     }
diff --git a/packages/EasyCodingStandard/src/Error/ErrorAndDiffCollector.php b/packages/EasyCodingStandard/src/Error/ErrorAndDiffCollector.php
index 14037cb01a..eebf5f0814 100644
--- a/packages/EasyCodingStandard/src/Error/ErrorAndDiffCollector.php
+++ b/packages/EasyCodingStandard/src/Error/ErrorAndDiffCollector.php
@@ -6,6 +6,8 @@
 
 use Nette\Utils\Arrays;
 use Symplify\EasyCodingStandard\ChangedFilesDetector\ChangedFilesDetector;
+use Symplify\EasyCodingStandard\ValueObject\Error\Error;
+use Symplify\EasyCodingStandard\ValueObject\Error\FileDiff;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
 final class ErrorAndDiffCollector
diff --git a/packages/EasyCodingStandard/src/Error/ErrorFactory.php b/packages/EasyCodingStandard/src/Error/ErrorFactory.php
index 747fa4aab3..ad09a26045 100644
--- a/packages/EasyCodingStandard/src/Error/ErrorFactory.php
+++ b/packages/EasyCodingStandard/src/Error/ErrorFactory.php
@@ -4,6 +4,7 @@
 
 namespace Symplify\EasyCodingStandard\Error;
 
+use Symplify\EasyCodingStandard\ValueObject\Error\Error;
 use Symplify\SmartFileSystem\SmartFileInfo;
 
 final class ErrorFactory
diff --git a/packages/EasyCodingStandard/src/Error/ErrorSorter.php b/packages/EasyCodingStandard/src/Error/ErrorSorter.php
index d7f20aa0c8..26076b22de 100644
--- a/packages/EasyCodingStandard/src/Error/ErrorSorter.php
+++ b/packages/EasyCodingStandard/src/Error/ErrorSorter.php
@@ -4,6 +4,8 @@
 
 namespace Symplify\EasyCodingStandard\Error;
 
+use Symplify\EasyCodingStandard\ValueObject\Error\Error;
+
 final class ErrorSorter
 {
     /**
diff --git a/packages/EasyCodingStandard/src/Error/FileDiffFactory.php b/packages/EasyCodingStandard/src/Error/FileDiffFactory.php
index 0ab1b705f7..18f9755b2e 100644
--- a/packages/EasyCodingStandard/src/Error/FileDiffFactory.php
+++ b/packages/EasyCodingStandard/src/Error/FileDiffFactory.php
@@ -4,6 +4,8 @@
 
 namespace Symplify\EasyCodingStandard\Error;
 
+use Symplify\EasyCodingStandard\ValueObject\Error\FileDiff;
+
 final class FileDiffFactory
 {
     /**
diff --git a/packages/EasyCodingStandard/src/HttpKernel/EasyCodingStandardKernel.php b/packages/EasyCodingStandard/src/HttpKernel/EasyCodingStandardKernel.php
index acb90d386e..78c076e95a 100644
--- a/packages/EasyCodingStandard/src/HttpKernel/EasyCodingStandardKernel.php
+++ b/packages/EasyCodingStandard/src/HttpKernel/EasyCodingStandardKernel.php
@@ -105,6 +105,8 @@ protected function build(ContainerBuilder $containerBuilder): void
      */
     protected function getContainerLoader(ContainerInterface $container): DelegatingLoader
     {
-        return (new DelegatingLoaderFactory())->createFromContainerBuilderAndKernel($container, $this);
+        $delegatingLoaderFactory = new DelegatingLoaderFactory();
+
+        return $delegatingLoaderFactory->createFromContainerBuilderAndKernel($container, $this);
     }
 }
diff --git a/packages/EasyCodingStandard/src/Error/Error.php b/packages/EasyCodingStandard/src/ValueObject/Error/Error.php
similarity index 94%
rename from packages/EasyCodingStandard/src/Error/Error.php
rename to packages/EasyCodingStandard/src/ValueObject/Error/Error.php
index 2a2270c4d9..052f197ee3 100644
--- a/packages/EasyCodingStandard/src/Error/Error.php
+++ b/packages/EasyCodingStandard/src/ValueObject/Error/Error.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Symplify\EasyCodingStandard\Error;
+namespace Symplify\EasyCodingStandard\ValueObject\Error;
 
 use Symplify\SmartFileSystem\SmartFileInfo;
 
diff --git a/packages/EasyCodingStandard/src/Error/FileDiff.php b/packages/EasyCodingStandard/src/ValueObject/Error/FileDiff.php
similarity index 95%
rename from packages/EasyCodingStandard/src/Error/FileDiff.php
rename to packages/EasyCodingStandard/src/ValueObject/Error/FileDiff.php
index a51a9789b1..8a94476ff0 100644
--- a/packages/EasyCodingStandard/src/Error/FileDiff.php
+++ b/packages/EasyCodingStandard/src/ValueObject/Error/FileDiff.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Symplify\EasyCodingStandard\Error;
+namespace Symplify\EasyCodingStandard\ValueObject\Error;
 
 use PhpCsFixer\Differ\DiffConsoleFormatter;
 
diff --git a/packages/MonorepoBuilder/src/ComposerJsonDecorator/ReplaceSectionJsonDecorator.php b/packages/MonorepoBuilder/src/ComposerJsonDecorator/ReplaceSectionJsonDecorator.php
index b146bde281..81bc807fa5 100644
--- a/packages/MonorepoBuilder/src/ComposerJsonDecorator/ReplaceSectionJsonDecorator.php
+++ b/packages/MonorepoBuilder/src/ComposerJsonDecorator/ReplaceSectionJsonDecorator.php
@@ -29,6 +29,11 @@ public function decorate(array $composerJson): array
         sort($mergedPackages);
 
         foreach ($mergedPackages as $mergedPackage) {
+            // prevent value override
+            if (isset($composerJson['replace'][$mergedPackage])) {
+                continue;
+            }
+
             $composerJson['replace'][$mergedPackage] = 'self.version';
         }
 
diff --git a/phpstan.neon b/phpstan.neon
index 94e81ed5f0..570af8c527 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -18,9 +18,10 @@ parameters:
         # Symfony workaround
         - packages/ChangelogLinker/src/DependencyInjection/Dummy/ResolveAutowiringExceptionHelper.php
         # 3rd party
-        - packages/EasyCodingStandard/packages/SniffRunner/src/File/File.php
+        - packages/EasyCodingStandard/packages/SniffRunner/src/ValueObject/File.php
         # tests
         - packages/PHPStanExtensions/tests/Rules/ClassMethod/Source/*
+        - packages/EasyCodingStandard/compiler/vendor/*
 
     autoload_files:
         - %currentWorkingDirectory%/tests/bootstrap.php
@@ -132,3 +133,8 @@ parameters:
         - '#in iterable type#'
         - '#Method Symplify\\PHPStanExtensions\\Tests\\Rules\\Classes\\MatchingTypeConstantRuleTest\:\:getRule\(\) return type with generic interface PHPStan\\Rules\\Rule does not specify its types\: TNodeType#'
         - '#Class Symplify\\PHPStanExtensions\\Rules\\ClassMethod\\BoolishClassMethodPrefixRule implements generic interface PHPStan\\Rules\\Rule but does not specify its types\: TNodeType#'
+
+        - '#Strict comparison using \=\=\= between string\|false and null will always evaluate to false#'
+        - '#Parameter \#1 \$json of static method Nette\\Utils\\Json\:\:decode\(\) expects string, string\|false given#'
+        - '#Parameter \#1 \$jsonContent of method Symplify\\EasyCodingStandard\\Compiler\\Packagist\\SymplifyStableVersionProvider\:\:loadContentJsonStringToArray\(\) expects string, string\|false given#'
+        - '#Method Symplify\\EasyCodingStandard\\Compiler\\Packagist\\SymplifyStableVersionProvider\:\:getLastKey\(\) should return string but returns int\|string\|null#'