composer-require-config.json

{
  "symbol-whitelist" : [
    "null", "true", "false",
    "static", "self", "parent",
    "array", "string", "int", "float", "bool", "iterable", "callable", "void", "object",
    "Composer\\Autoload\\ClassLoader",
    "League\\Uri\\Exceptions\\SyntaxError"
  ],
  "php-core-extensions" : [
    "Core",
    "date",
    "pcre",
    "filter",
    "dom",
    "libxml",
    "hash",
    "SimpleXML",
    "Phar",
    "zlib",
    "Reflection",
    "SPL",
    "standard"
  ]
}