**Prettier 2.8.7** [Playground link](https://prettier.io/playground/#N4Igxg9gdgLgprEAuEAKAhgSgAQF4B82A9EemQDpToDcllqOB2GANNgEZtjEBU267bjyKZqIFiAgAHGAEtoAZ2Sh0AJ1UQA7gAU1CJSnQAbTegCeSie1XowAazgwAyugC2cADKyocZADNjBTgrG3tHJylbbwBzZBhVAFdgkDhXdjgAEwzMj3QoaIT0aLgAMQhVV3QYOXzkEHQEmAhxEAALGFcjAHVW2XgFSLA4J30+2QA3PrM6sAVLEG8g1RhtG2jK-0DkgCsFAA8nGKM4AEUEiHhNoyCJSNUluvYBOCMWqVVvGC7ZDJhW5AAHAAGW4aIJdGxSOrvOBLca+CQAR3O8FW0gM9QUAFofJlMi1VHBkbJCasihskAFrskgq5ZHFEjSjnAAILVD7sRpwbRwVReHxXG4gBTMs4XXyUrYSGACb6-f5IABM0pssiMMQAwhBXBSUgoAKwtBJBAAqAgMVKF4ySAEkoNlYE4wB8ZCz7U4YGZjoK4ABfX1AA) <!-- prettier-ignore --> ```sh --parser babel ``` **Input:** <!-- prettier-ignore --> ```jsx (a) => //aaa a; () => (a, b, c /* abc */); ``` **Output:** <!-- prettier-ignore --> ```jsx ( a //aaa ) => a; (/* abc */) => (a, b, c); ``` **Expected behavior:** ```jsx (a) => //aaa a; () => (a, b, c /* abc */); ``` **Attention** Working on this will conflict with https://github.com/prettier/prettier/pull/14633