PHP-CS-Fixer/.composer-require-checker.json

{
    "symbol-whitelist" : [
        "HHVM_VERSION_ID",
        "PHPUnit\\Framework\\TestCase", "Prophecy\\Argument",
        "GeckoPackages\\PHPUnit\\Constraints\\SameStringsConstraint",

        "null", "true", "false",
        "static", "self", "parent",
        "array", "string", "int", "float", "bool", "iterable", "callable", "void"
    ],
    "php-core-extensions" : [
        "dom", "mbstring", "Phar",

        "Core", "date", "pcre", "Reflection", "SPL", "standard"
    ]
}