Improved static analysis

phpstan.src.neon.dist

@@ -1,6 +1,8 @@
 parameters:
   level: max
   ignoreErrors:
+    - '#Anonymous function should have native return typehint ".+".#'
+    - '#Call to function is_string\(\) with string will always evaluate to true.#'
     - '#Variable \$defaults might not be defined.#'
     - '/^Parameter \#1 \$readers of class Dotenv\\Repository\\[a-zA-Z]*Repository[a-zA-Z]* constructor expects/'
     - '/^Parameter \#2 \$writers of class Dotenv\\Repository\\[a-zA-Z]*Repository[a-zA-Z]* constructor expects/'
@@ -9,3 +11,4 @@ parameters:
     - '#Parameter \#1 \$callable of method PhpOption\\Option<Dotenv\\Loader\\Value\|null>::map\(\) expects callable\(Dotenv\\Loader\\Value\|null\): mixed, Closure\(Dotenv\\Loader\\Value\): mixed given.#'
     - '#Parameter \#1 \$callable of method PhpOption\\Option<array\|null>::[a-z]+\(\) expects callable\(array\|null\): [a-z]+, Closure\(array\): mixed given.#'
     - '#Parameter \#1 \$name of method Dotenv\\Repository\\AbstractRepository::set\(\) expects string, string\|null given.#'
+    - '#Parameter \#.+ of method Dotenv\\Repository\\AbstractRepository::offset.+ should be contravariant .+#'

vendor-bin/phpstan/composer.json

@@ -1,5 +1,9 @@
 {
     "require": {
-        "phpstan/phpstan": "^0.12.25"
+        "phpstan/phpstan": "^0.12.25",
+        "phpstan/extension-installer": "^1.0.4",
+        "phpstan/phpstan-deprecation-rules": "^0.12.4",
+        "phpstan/phpstan-strict-rules": "^0.12.2",
+        "thecodingmachine/phpstan-strict-rules": "^0.12.0"
     }
 }