var call = require('../internals/function-call'); var hasOwn = require('../internals/has-own-property'); var isPrototypeOf = require('../internals/object-is-prototype-of'); var regExpFlags = require('../internals/regexp-flags'); var RegExpPrototype = RegExp.prototype; module.exports = function (R) { var flags = R.flags; return flags === undefined && !('flags' in RegExpPrototype) && !hasOwn(R, 'flags') && isPrototypeOf(RegExpPrototype, R) ? call(regExpFlags, R) : flags; };