diff --git a/.github/main.workflow b/.github/main.workflow
new file mode 100644
index 0000000..04d7fe5
--- /dev/null
+++ b/.github/main.workflow
@@ -0,0 +1,35 @@
+workflow "Qa workflow" {
+  on = "push"
+  resolves = [
+    "PHPStan",
+    "composer-require-checker",
+    "Code style check",
+  ]
+}
+
+action "composer" {
+  uses = "docker://composer"
+  secrets = ["GITHUB_TOKEN"]
+  args = "install --no-interaction --prefer-dist --optimize-autoloader"
+}
+
+action "PHPStan" {
+  uses = "docker://oskarstark/phpstan-ga"
+  args = "analyse src tests --level max --configuration phpstan.neon"
+  secrets = ["GITHUB_TOKEN"]
+  needs = ["composer"]
+}
+
+action "composer-require-checker" {
+  uses = "docker://phpga/composer-require-checker-ga"
+  secrets = ["GITHUB_TOKEN"]
+  args = "check --config-file ./composer-require-config.json composer.json"
+  needs = ["composer"]
+}
+
+action "Code style check" {
+  uses = "docker://oskarstark/phpcs-ga"
+  secrets = ["GITHUB_TOKEN"]
+  args = "-d memory_limit=1024M"
+  needs = ["composer"]
+}
diff --git a/.travis.yml b/.travis.yml
index 049308e..0f8e8a7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,19 +26,6 @@ jobs:
         - travis_retry php phive.phar --no-progress install --trust-gpg-keys E82B2FB314E9906E php-coveralls/php-coveralls && ./tools/php-coveralls --verbose
         - travis_retry wget --no-verbose https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover build/logs/clover.xml
 
-    - stage: analysis
-      php: 7.1
-      before_script:
-        - travis_retry wget --no-verbose https://phar.io/releases/phive.phar
-        - travis_retry php phive.phar --no-progress install --trust-gpg-keys 8E730BA25823D8B5 phpstan
-      script:
-        - ./tools/phpstan analyse src --level max --configuration phpstan.neon
-
-    - stage: analysis
-      php: 7.1
-      script:
-        - composer create-project symplify/easy-coding-standard temp/ecs ^3 && temp/ecs/bin/ecs check src tests
-
 cache:
   directories:
   - $HOME/.composer
diff --git a/composer-require-config.json b/composer-require-config.json
new file mode 100644
index 0000000..19eee4f
--- /dev/null
+++ b/composer-require-config.json
@@ -0,0 +1,15 @@
+{
+  "symbol-whitelist" : [
+    "null", "true", "false",
+    "static", "self", "parent",
+    "array", "string", "int", "float", "bool", "iterable", "callable", "void", "object", "XSLTProcessor"
+  ],
+  "php-core-extensions" : [
+    "Core",
+    "pcre",
+    "Reflection",
+    "tokenizer",
+    "SPL",
+    "standard"
+  ]
+}
diff --git a/composer.json b/composer.json
index df3681c..fdd0012 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,8 @@
     },
     "require-dev": {
         "mockery/mockery": "~1",
-        "phpunit/phpunit": "~6"
+        "phpunit/phpunit": "~6",
+        "ext-tokenizer": "^7.1"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
index 0bb56da..72e114f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b86fda2a5ea5ce96e6f3d75584fc43fc",
+    "content-hash": "06b34e8692439fcd33da549a3379fe6e",
     "packages": [
         {
             "name": "phpdocumentor/reflection-common",
@@ -815,6 +815,7 @@
                 "mock",
                 "xunit"
             ],
+            "abandoned": true,
             "time": "2017-02-02T10:36:38+00:00"
         },
         {
@@ -1337,9 +1338,11 @@
         "phpdocumentor/reflection-common": 10
     },
     "prefer-stable": false,
-    "prefer-lowest": true,
+    "prefer-lowest": false,
     "platform": {
         "php": ">=7.1"
     },
-    "platform-dev": []
+    "platform-dev": {
+        "ext-tokenizer": "^7.1"
+    }
 }
diff --git a/easy-coding-standard.neon b/easy-coding-standard.neon
deleted file mode 100644
index a76d463..0000000
--- a/easy-coding-standard.neon
+++ /dev/null
@@ -1,37 +0,0 @@
-includes:
-    - temp/ecs/config/clean-code.neon
-    - temp/ecs/config/psr2.neon
-    - temp/ecs/config/common.neon
-
-parameters:
-    exclude_checkers:
-        # from temp/ecs/config/common.neon
-        - PhpCsFixer\Fixer\ClassNotation\OrderedClassElementsFixer
-        - PhpCsFixer\Fixer\PhpUnit\PhpUnitStrictFixer
-        - PhpCsFixer\Fixer\ControlStructure\YodaStyleFixer
-        # from temp/ecs/config/spaces.neon
-        - PhpCsFixer\Fixer\Operator\NotOperatorWithSuccessorSpaceFixer
-
-    skip:
-        PHP_CodeSniffer\Standards\Generic\Sniffs\NamingConventions\CamelCapsFunctionNameSniff:
-            - */tests/**
-        PHP_CodeSniffer\Standards\Squiz\Sniffs\Classes\ValidClassNameSniff:
-            - src/Types/Array_.php
-            - src/Types/Callable_.php
-            - src/Types/Float_.php
-            - src/Types/Iterable_.php
-            - src/Types/Mixed_.php
-            - src/Types/Null_.php
-            - src/Types/Object_.php
-            - src/Types/Parent_.php
-            - src/Types/Resource_.php
-            - src/Types/Self_.php
-            - src/Types/Static_.php
-            - src/Types/String_.php
-            - src/Types/Void_.php
-        PhpCsFixer\Fixer\Import\OrderedImportsFixer:
-            - *tests/unit/Types/ContextFactoryTest.php
-        PhpCsFixer\Fixer\Import\SingleImportPerStatementFixer:
-            - *tests/unit/Types/ContextFactoryTest.php
-        PhpCsFixer\Fixer\Import\SingleLineAfterImportsFixer:
-            - *tests/unit/Types/ContextFactoryTest.php
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
new file mode 100644
index 0000000..732b5fe
--- /dev/null
+++ b/phpcs.xml.dist
@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<ruleset name="phpDocumentor">
+ <description>The coding standard for phpDocumentor.</description>
+
+    <file>src</file>
+    <file>tests/unit</file>
+    <exclude-pattern>*/tests/unit/Types/ContextFactoryTest.php</exclude-pattern>
+    <arg value="p"/>
+     <rule ref="PSR2">
+         <include-pattern>*\.php</include-pattern>
+     </rule>
+      <rule ref="Squiz.Classes.ValidClassName.NotCamelCaps">
+         <exclude-pattern>*/src/*_.php</exclude-pattern>
+     </rule>
+</ruleset>
diff --git a/src/TypeResolver.php b/src/TypeResolver.php
index ca0cf9b..e5b5fc2 100644
--- a/src/TypeResolver.php
+++ b/src/TypeResolver.php
@@ -115,7 +115,13 @@ public function resolve($type, Context $context = null)
         }
 
         // split the type string into tokens `|`, `?`, `(`, `)[]`, '<', '>' and type names
-        $tokens = preg_split('/(\\||\\?|<|>|,|\\(|\\)(?:\\[\\])+)/', $type, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
+        $tokens = preg_split(
+            '/(\\||\\?|<|>|,|\\(|\\)(?:\\[\\])+)/',
+            $type,
+            -1,
+            PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE
+        );
+
         if (false === $tokens) {
             throw new \InvalidArgumentException('Unable to split the type string "' . $type . '" into tokens');
         }
@@ -200,7 +206,7 @@ private function parseTypes(\ArrayIterator $tokens, Context $context, $parserCon
                 }
 
                 $classType = array_pop($types);
-                if ($classType) {
+                if ($classType !== null) {
                     $types[] = $this->resolveCollection($tokens, $classType, $context);
                 }