Commaless syntax should be allowed in flow typedefs. [lscdiag](https://wcjohnson.github.io/lscdiag/?v=1&s=eMOawr1QQW7DgyAQw7wKw5ozwolow5zDhsKRwqVKfkFPwr3CpVFFMHbCqcOBEFgiWxZ_L8K0wofDnsKswp7Cuhd2w4TDrMOsw4zCrsOQwqsZwqPClwHCmhXDng13w6VtWyPCkXcceUHDosKzwrofFj_DtixXNR7Cn2pdc1fDnREaw7RRw5JMMMOjw4HDnBbDjMO_D8KVOMKedH3DgsOFw43Dsw8hw5EtwokVwoLCjV7DiMOSw6kgwqDCgTwqw4kreSbDq8ObRAhvSEDCr8KmwqHCgMOrL0jCkHXCoypjw4jCr8OZw77CmVF2wqEQwqTClgJlw7diwrvCrDlFwq3Di347w7Vqw7gOY8KNU1rDusK8w4fCqsOBw5vDqMOaw4c9w5vCsx3Dl8OuwoNDSsKbccO-bMKWw77Ck8Obw4zDlirDpDPCnjduwrwVw6nCksOSF3bCn8KpwpU#)
