**Prettier 2.7.1** [Playground link](https://prettier.io/playground/#N4Igxg9gdgLgprEAuc0DOMAEAPXf8GFHGFI4kW4A8AfJgLwA6UmmAhgE4DmDdUArgBtBAbhAAaEBAAOMAJbpkoThwgB3AAqcEaZCDYA3CHIAmEkACMObMAGs4MAMpsAtnAAycqHGQAzNoJocJJWNvZO0jZeXMgwHPzBIHAuFnAmJmnubFBc-GxccABiEBwubDDyOXps-DAQ5gAWMC6CAOoNcvBokWBwjjqdcgadAJ56YGi6kl5BHDAa1lxlfgFBkgBWaNiO0YJwAIr8EPArgYmRHLN6voLq5tIcXjCtpjANyAAcAAySDxBBrWs0j0DzgswMPkkAEcjvAFjJdCg2GgALTeNJpcwcOAwuTYhb5ZZIfxnSRBFxyWLxRJoXYHWE+JBxBKSGBsCwvExvZAAJlZ1jkgmiAGEIC4ifphOZ+EEACrsxEktYgAwJACSUAysEcYEesgAgprHDARntTkEAL4WoA) <!-- prettier-ignore --> ```sh --parser flow --arrow-parens avoid --trailing-comma all ``` **Input:** <!-- prettier-ignore --> ```jsx const xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx: xxxxxxxxxxxxxxxxxxxxxx<> = arg => null; ``` **Output:** <!-- prettier-ignore --> ```jsx const xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx: xxxxxxxxxxxxxxxxxxxxxx< , > = arg => null; ``` **Expected behavior:** Not-broken code. I'd suggest probably: ```jsx const xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx: xxxxxxxxxxxxxxxxxxxxxx<> = arg => null; ```