Return new static instance to allow LSB

CHANGELOG.md

@@ -4,9 +4,10 @@
 
 ## Unreleased
 - Add AWS CodeBuild detection support.
+- Allow late static binding in `CiDetector::fromEnvironment()` when inheriting the class.
 
 ## 3.3.0 - 2020-03-06
-- Allow injecting instance of `Env` into `CiDetector` (useful for environment mocking in unit tests).
+- Allow injecting instance of `Env` using `CiDetector::fromEnvironment()` (useful for environment mocking in unit tests).
 
 ## 3.2.0 - 2020-02-18
 - Add GitHub Actions detection support.

phpstan.neon

@@ -1,6 +1,10 @@
 parameters:
     ignoreErrors:
         - '/Parameter \#1 \$function of function call_user_func expects callable/'
+
+        # TODO: should be solved in next major version by declaring CiDetector final
+        - message: '#Unsafe usage of new static\(\)#'
+          path: 'src/CiDetector.php'
     level: 7
     paths:
         - src/

src/CiDetector.php

@@ -34,7 +34,11 @@ public function __construct()
 
     public static function fromEnvironment(Env $environment): self
     {
-        return new static($environment);
+        $detector = new static();
+
+        $detector->environment = $environment;
+
+        return $detector;
     }
 
     /**